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  • 1. Abernethy, R.
    et al.
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Ziese, Markus G.
    State of the Climate in 20172018In: Bulletin of The American Meteorological Society - (BAMS), ISSN 0003-0007, E-ISSN 1520-0477, Vol. 99, no 8, p. Si-S310Article in journal (Refereed)
  • 2.
    Ades, M.
    et al.
    European Ctr Medium Range Weather Forecasts, Reading, Berks, England..
    Adler, R.
    Univ Maryland, College Pk, MD 20742 USA..
    Allan, Rob
    Met Off Hadley Ctr, Exeter, Devon, England..
    Allan, R. P.
    Univ Reading, Reading, Berks, England..
    Anderson, J.
    Hampton Univ, Dept Atmospher & Planetary Sci, Hampton, VA 23668 USA..
    Arguez, Anthony
    NOAA NESDIS Natl Ctr Environm Informat, Asheville, NC USA..
    Arosio, C.
    Univ Bremen, Bremen, Germany..
    Augustine, J. A.
    NOAA OAR Earth Syst Res Labs, Boulder, CO USA..
    Azorin-Molina, C.
    Ctr Invest Desertificac Spanish Natl Res Council, Moncada, Valencia, Spain.;Univ Gothenburg, Dept Earth Sci, Reg Climate Grp, Gothenburg, Sweden..
    Barichivich, J.
    Pontificia Univ Catolica Valparaiso, Inst Geog, Valparaiso, Chile..
    Barnes, J.
    NOAA OAR ESRL Global Monitoring Lab, Boulder, CO USA..
    Beck, H. E.
    Princeton Univ, Dept Civil & Environm Engn, Princeton, NJ 08544 USA..
    Becker, Andreas
    Deutsch Wetterdienst, Global Precipitat Climatol Ctr, Offenbach, Germany..
    Bellouin, Nicolas
    Univ Reading, Reading, Berks, England..
    Benedetti, Angela
    European Ctr Medium Range Weather Forecasts, Reading, Berks, England..
    Berry, David I.
    Natl Oceanog Ctr, Southampton, Hants, England..
    Blenkinsop, Stephen
    Newcastle Univ, Sch Engn, Newcastle Upon Tyne, Tyne & Wear, England..
    Bock, Olivier
    Univ Paris, CNRS, Inst Phys Globe Paris, IGN, Paris, France.;IGN, ENSG Geomat, Marne La Vallee, France..
    Bosilovich, Michael G.
    NASA, Goddard Space Flight Ctr, Global Modeling & Assimilat Off, Greenbelt, MD USA..
    Boucher, Olivier
    Sorbonne Univ, Paris, France..
    Buehler, S. A.
    Univ Hamburg, Hamburg, Germany..
    Carrea, Laura
    Univ Reading, Dept Meteorol, Reading, Berks, England..
    Christiansen, Hanne H.
    Univ Ctr Svalbard, Dept Geol, Longyearbyen, Norway..
    Chouza, F.
    CALTECH, Jet Prop Lab, Wrightwood, CA USA..
    Christy, John R.
    Univ Alabama Huntsville, Huntsville, AL USA..
    Chung, E. -S
    Coldewey-Egbers, Melanie
    German Aerosp Ctr DLR Oberpfaffenhofen, Wessling, Germany..
    Compo, Gil P.
    Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA.;NOAA Earth Syst Res Lab, Div Phys Sci, Boulder, CO USA..
    Cooper, Owen R.
    NOAA OAR Earth Syst Res Labs, Boulder, CO USA.;Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA..
    Covey, Curt
    Lawrence Livermore Natl Lab, Livermore, CA 94550 USA..
    Crotwell, A.
    Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA..
    Davis, Sean M.
    Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA.;NOAA OAR Earth Syst Res Lab, Boulder, CO USA..
    de Eyto, Elvira
    Inst Marine, Furnace, Newport, Ireland..
    de Jeu, Richard A. M.
    VanderSat, B. V.
    DeGasperi, Curtis L.
    King Cty Water & Land Resources Div, Seattle, WA USA..
    Degenstein, Doug
    Univ Saskatchewan, Saskatoon, SK, Canada..
    Di Girolamo, Larry
    Univ Illinois, Champaign, IL USA..
    Dokulil, Martin T.
    Univ Innsbruck, Res Dept Limnol, Innsbruck, Austria..
    Donat, Markus G.
    Barcelona Supercomp Ctr, Barcelona, Spain..
    Dorigo, Wouter A.
    TU Wien Vienna Univ Technol, Dept Geodesy & Geoinformat, Vienna, Austria..
    Dunn, R. J. H.
    Met Off Hadley Ctr, Exeter, Devon, England..
    Durre, Imke
    NOAA NESDIS Natl Ctr Environm Informat, Asheville, NC USA..
    Dutton, Geoff S.
    NOAA OAR Earth Syst Res Labs, Boulder, CO USA.;Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA..
    Duveiller, G.
    European Commiss, Joint Res Ctr, Ispra, Italy..
    Elkins, James W.
    NOAA OAR Earth Syst Res Labs, Boulder, CO USA..
    Fioletov, Vitali E.
    Environm & Climate Change Canada, Toronto, ON, Canada..
    Flemming, Johannes
    European Ctr Medum Range Weather Forecasts, Reading, Berks, England..
    Foster, Michael J.
    Univ Wisconsin Madison, Cooperat Inst Meteorol Satellite Studies, Space Sci & Engn Ctr, Madison, WI USA..
    Frey, Richard A.
    Univ Wisconsin Madison, Cooperat Inst Meteorol Satellite Studies, Space Sci & Engn Ctr, Madison, WI USA..
    Frith, Stacey M.
    Sci Syst & Applicat Inc, Lanham, MD USA.;NASA, Goddard Space Flight Ctr, Greenbelt, MD USA..
    Froidevaux, Lucien
    CALTECH, Jet Prop Lab, Pasadena, CA USA..
    Garforth, J.
    Woodland Trust, Grantham, England..
    Gobron, N.
    European Commiss, Joint Res Ctr, Ispra, Italy..
    Gupta, S. K.
    Sci Syst & Applicat Inc, Hampton, VA USA..
    Haimberger, Leopold
    Univ Vienna, Dept Meteorol & Geophys, Vienna, Austria..
    Hall, Brad D.
    NOAA OAR Earth Syst Res Labs, Boulder, CO USA..
    Harris, Ian
    Univ East Anglia, Natl Ctr Atmospher Sci, Norwich, Norfolk, England.;Univ East Anglia, Sch Environm Sci, Climat Res Unit, Norwich, Norfolk, England..
    Heidinger, Andrew K.
    Univ Wisconsin Madison, NOAA NESDIS STAR, Madison, WI USA..
    Hemming, D. L.
    Met Off Hadley Ctr, Exeter, Devon, England.;Univ Birmingham, Birmingham Inst Forest Res, Birmingham, W Midlands, England..
    Ho, Shu-peng (Ben)
    NOAA NESDIS Ctr Satellite Applicat & Res, College Pk, MD USA..
    Hubert, Daan
    Royal Belgian Inst Space Aeron BIRA, Brussels, Belgium..
    Hurst, Dale F.
    NOAA OAR Earth Syst Res Labs, Boulder, CO USA.;Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA..
    Huser, I.
    Deutsch Wetterdienst, Offenbach, Germany..
    Inness, Antje
    European Ctr Medium Range Weather Forecasts, Reading, Berks, England..
    Isaksen, K.
    Norwegian Meteorol Inst, Oslo, Norway..
    John, Viju
    EUMETSAT, Darmstadt, Germany..
    Jones, Philip D.
    Univ East Anglia, Sch Environm Sci, Climat Res Unit, Norwich, Norfolk, England..
    Kaiser, J. W.
    Deutsch Wetterdienst, Offenbach, Germany..
    Kelly, S.
    Dundalk Inst Technol, Dundalk, Ireland..
    Khaykin, S.
    Sorbonne Univ, CNRS, LATMOS IPSL, UVSQ, Guyancourt, France..
    Kidd, R.
    Earth Observat Data Ctr GmbH, Vienna, Austria..
    Kim, Hyungiun
    Univ Tokyo, Inst Ind Sci, Tokyo, Japan..
    Kipling, Z.
    European Ctr Medium Range Weather Forecasts, Reading, Berks, England..
    Kraemer, B. M.
    IGB Leibniz Inst Freshwater Ecol & Inland Fisheri, Berlin, Germany..
    Kratz, D. P.
    NASA, Langley Res Ctr, Hampton, VA 23665 USA..
    La Fuente, R. S.
    Dundalk Inst Technol, Dundalk, Ireland..
    Lan, Xin
    NOAA OAR Earth Syst Res Labs, Boulder, CO USA.;Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA..
    Lantz, Kathleen O.
    NOAA OAR Earth Syst Res Lab, Boulder, CO USA..
    Leblanc, T.
    CALTECH, Jet Prop Lab, Wrightwood, CA USA..
    Li, Bailing
    NASA Goddard Space Flight Ctr, Hydrol Sci Lab, Greenbelt, MD USA.;Univ Maryland, Earth Syst Sci Interdisciplinary Ctr, College Pk, MD 20742 USA..
    Loeb, Norman G.
    NASA, Langley Res Ctr, Hampton, VA 23665 USA..
    Long, Craig S.
    NOAA NWS Natl Ctr Environm Predict, College Pk, MD USA..
    Loyola, Diego
    German Aerosp Ctr DLR Oberpfaffenhofen, Wessling, Germany..
    Marszelewski, Wlodzimierz
    Nicolaus Copernicus Univ, Dept Hydrol & Water Management, Torun, Poland..
    Martens, B.
    Univ Ghent, Hydro Climate Extremes Lab, Ghent, Belgium..
    May, Linda
    Ctr Ecol & Hydrol, Edinburgh, Midlothian, Scotland..
    Mayer, Michael
    European Ctr Medium Range Weather Forecasts, Reading, Berks, England.;Univ Vienna, Dept Meteorol & Geophys, Vienna, Austria..
    McCabe, M. F.
    King Abdullah Univ Sci & Technol, Div Biol & Environm Sci & Engn, Thuwal, Saudi Arabia..
    McVicar, Tim R.
    CSIRO Land & Water, Canberra, ACT, Australia.;Australian Res Council Ctr Excellence Climate Ext, Sydney, NSW, Australia..
    Mears, Carl A.
    Remote Sensing Syst, Santa Rosa, CA USA..
    Menzel, W. Paul
    Univ Wisconsin Madison, Space Sci & Engn Ctr, Madison, WI USA..
    Merchant, Christopher J.
    Univ Reading, Dept Meteorol, Reading, Berks, England.;Univ Reading, Natl Ctr Earth Observat, Reading, Berks, England..
    Miller, Ben R.
    NOAA OAR Earth Syst Res Labs, Boulder, CO USA.;Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA..
    Miralles, Diego G.
    Montzka, Stephen A.
    NOAA OAR Earth Syst Res Labs, Boulder, CO USA..
    Morice, Colin
    Met Off Hadley Ctr, Exeter, Devon, England..
    Muhle, Jens
    Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA..
    Myneni, R.
    Boston Univ, Dept Earth & Environm, Boston, MA 02215 USA..
    Nicolas, Julien P.
    European Ctr Medium Range Weather Forecasts, Reading, Berks, England..
    Noetzli, Jeannette
    WSL Inst Snow & Avalanche Res SLF, Davos, Switzerland..
    Osborn, Tim J.
    Univ East Anglia, Sch Environm Sci, Climat Res Unit, Norwich, Norfolk, England..
    Park, T.
    NASA, Ames Res Ctr, Moffett Field, CA 94035 USA.;Bay Area Environm Res Inst, Moffett Field, CA USA..
    Pasik, A.
    TU Wien Vienna Univ Technol, Dept Geodesy & Geoinformat, Vienna, Austria..
    Paterson, Andrew M.
    Ontario Minist Environm & Climate Change, Dorset Environm Sci Ctr, Dorset, ON, Canada..
    Pelto, Mauri S.
    Nichols Coll, Dudley, MA USA..
    Perkins-Kirkpatrick, S.
    Univ New South Wales, Sydney, NSW, Australia..
    Petron, G.
    Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA..
    Phillips, C.
    Univ Wisconsin Madison, Dept Atmospher & Ocean Sci, Madison, WI USA..
    Pinty, Bernard
    European Commiss, Joint Res Ctr, Ispra, Italy..
    Po-Chedley, S.
    Lawrence Livermore Natl Lab, Livermore, CA 94550 USA..
    Polvani, L.
    Columbia Univ, New York, NY USA..
    Preimesberger, W.
    TU Wien Vienna Univ Technol, Dept Geodesy & Geoinformat, Vienna, Austria..
    Pulkkanen, M.
    Finnish Environm Inst SYKE, Freshwater Ctr, Helsinki, Finland..
    Randel, W. J.
    Natl Ctr Atmospher Res, POB 3000, Boulder, CO 80307 USA..
    Remy, Samuel
    UPMC, Inst Pierre Simon Laplace, CNRS, Paris, France..
    Ricciardulli, L.
    Richardson, A. D.
    No Arizona Univ, Sch Informat Comp & Cyber Syst, Flagstaff, AZ 86011 USA.;No Arizona Univ, Ctr Ecosyst Sci & Soc, Flagstaff, AZ 86011 USA..
    Rieger, L.
    Univ Saskatchewan, Saskatoon, SK, Canada..
    Robinson, David A.
    Rutgers State Univ, Dept Geog, Piscataway, NJ USA..
    Rodell, Matthew
    NASA Goddard Space Flight Ctr, Hydrol Sci Lab, Greenbelt, MD USA..
    Rosenlof, Karen H.
    NOAA OAR Earth Syst Res Labs, Boulder, CO USA..
    Roth, Chris
    Univ Saskatchewan, Saskatoon, SK, Canada..
    Rozanov, A.
    Univ Bremen, Bremen, Germany..
    Rusak, James A.
    Ontario Minist Environm & Climate Change, Dorset Environm Sci Ctr, Dorset, ON, Canada..
    Rusanovskaya, O.
    Irkutsk State Univ, Inst Biol, Irkutsk, Russia..
    Rutishauser, T.
    Univ Bern, Inst Geog, Bern, Switzerland.;Univ Bern, Oeschger Ctr, Bern, Switzerland..
    Sanchez-Lugo, Ahira
    NOAA NESDIS Natl Ctr Environm Informat, Asheville, NC USA..
    Sawaengphokhai, P.
    Sci Syst & Applicat Inc, Hampton, VA USA..
    Scanlon, T.
    TU Wien Vienna Univ Technol, Dept Geodesy & Geoinformat, Vienna, Austria..
    Schenzinger, Verena
    Univ Vienna, Dept Meteorol & Geophys, Vienna, Austria..
    Schladow, S. Geoffey
    Univ Calif Davis, Tahoe Environm Res Ctr, Davis, CA 95616 USA..
    Schlegel, R. W.
    Woods Hole Oceanog Inst, Dept Phys Oceanog, Woods Hole, MA 02543 USA..
    Schmid, Martin Eawag
    Swiss Fed Inst Aquat Sci & Technol, Kastanienbaum, Switzerland..
    Selkirk, H. B.
    Univ Space Res Assoc, NASA Goddard Space Flight Ctr, Greenbelt, MD USA..
    Sharma, S.
    York Univ, Toronto, ON, Canada..
    Shi, Lei
    NOAA NESDIS, Natl Ctr Environm Informat, Asheville, NC USA..
    Shimaraeva, S. V.
    Irkutsk State Univ, Inst Biol, Irkutsk, Russia..
    Silow, E. A.
    Irkutsk State Univ, Inst Biol, Irkutsk, Russia..
    Simmons, Adrian J.
    European Ctr Medium Range Weather Forecasts, Reading, Berks, England..
    Smith, C. A.
    Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA..
    Smith, Sharon L.
    Nat Resources Canada, Geol Survey Canada, Ottawa, ON, Canada..
    Soden, B. J.
    Univ Miami, Rosenstiel Sch Marine & Atmospher Sci, Key Biscayne, FL USA..
    Sofieva, Viktoria
    Finnish Meteorol Inst, Helsinki, Finland..
    Sparks, T. H.
    Poznan Univ Life Sci, Poznan, Poland..
    Stackhouse, Paul W., Jr.
    NASA, Langley Res Ctr, Hampton, VA 23665 USA..
    Stanitski, D. M.
    NOAA OAR Earth Syst Res Labs, Boulder, CO USA..
    Steinbrecht, Wolfgang
    German Weather Serv DWD, Hohenpeissenberg, Germany..
    Streletskiy, Dimitri A.
    George Washington Univ, Dept Geog, Washington, DC USA..
    Taha, G.
    GESTAR, Columbia, MD USA..
    Telg, Hagen
    Thackeray, S. J.
    Ctr Ecol & Hydrol, Lancaster, England..
    Timofeyev, M. A.
    Irkutsk State Univ, Inst Biol, Irkutsk, Russia..
    Tourpali, Kleareti
    Aristotle Univ Thessaloniki, Thessaloniki, Greece..
    Tye, Mari R.
    Natl Ctr Atmospher Res, Capac Ctr Climate & Weather Extremes, POB 3000, Boulder, CO 80307 USA..
    van der A, Ronald J.
    Royal Netherlands Meteorol Inst, De Bilt, Netherlands..
    van der Schalie, Robin
    van der Schrier, Gerard
    Royal Netherlands Meteorol Inst, De Bilt, Netherlands..
    van der Werf, Guido R.
    Vrije Univ Amsterdam, Amsterdam, Netherlands..
    Verburg, Piet
    Natl Inst Water & Atmospher Res, Hamilton, New Zealand..
    Vernier, Jean-Paul
    NASA, Langley Res Ctr, Hampton, VA 23665 USA..
    Vomel, Holger
    Natl Ctr Atmospher Res, Earth Observing Lab, POB 3000, Boulder, CO 80307 USA..
    Vose, Russell S.
    NOAA NESDIS Natl Ctr Environm Informat, Asheville, NC USA..
    Wang, Ray
    Georgia Inst Technol, Atlanta, GA 30332 USA..
    Watanabe, Shohei G.
    Univ Calif Davis, Tahoe Environm Res Ctr, Davis, CA 95616 USA..
    Weber, Mark
    Univ Bremen, Bremen, Germany..
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala Univ, Dept Ecol & Genet Limnol, Uppsala, Sweden..
    Wiese, David
    CALTECH, Jet Prop Lab, Pasadena, CA USA..
    Wilber, Anne C.
    Sci Syst & Applicat Inc, Hampton, VA USA..
    Wild, Jeanette D.
    NOAA Climate Predict Ctr, College Pk, MD USA.;Univ Maryland, ESSIC, College Pk, MD 20742 USA..
    Willett, K. M.
    Met Off Hadley Ctr, Exeter, Devon, England..
    Wong, Takmeng
    NASA, Langley Res Ctr, Hampton, VA 23665 USA..
    Woolway, R. Iestyn
    Dundalk Inst Technol, Dundalk, Ireland..
    Yin, Xungang
    NOAA NESDIS Natl Ctr Environm Informat, ERT Inc, Asheville, NC USA..
    Zhao, Lin
    Nanjing Univ Informat Sci & Technol, Sch Geog Sci, Nanjing, Peoples R China..
    Zhao, Guanguo
    Univ Illinois, Champaign, IL USA..
    Zhou, Xinjia
    Ziemke, Jerry R.
    NASA, Goddard Space Flight Ctr, Greenbelt, MD USA.;Morgan State Univ, Goddard Earth Sci Technol & Res, Baltimore, MD 21239 USA..
    Ziese, Markus
    Deutsch Wetterdienst, Global Precipitat Climatol Ctr, Offenbach, Germany..
    Global Climate: in State of the climate in 20192020In: Bulletin of The American Meteorological Society - (BAMS), ISSN 0003-0007, E-ISSN 1520-0477, Vol. 101, no 8, p. S17-S127Article in journal (Refereed)
  • 3. Ades, M.
    et al.
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Ziese, Markus
    State of the Climate in 20182019In: Bulletin of The American Meteorological Society - (BAMS), ISSN 0003-0007, E-ISSN 1520-0477, Vol. 100, no 9, p. Si-S306Article in journal (Other academic)
  • 4. Adrian, Rita
    et al.
    O`Reilly, Catherine M.
    Zagarese, Horacio
    Baines, Stephen B.
    Hessen, Dag O.
    Keller, Wendel
    Livingstone, David M.
    Sommaruga, Ruben
    Straile, Dietmar
    Van Donk, Ellen
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Limnology.
    Winder, Monika
    Lakes as sentinels of climate change2009In: Limnology and Oceanography, ISSN 0024-3590, E-ISSN 1939-5590, Vol. 54, no 6(2), p. 2283-2297Article in journal (Refereed)
    Abstract [en]

    While there is a general sense that lakes can act as sentinels of climate change, their efficacy has not been thoroughly analyzed. We identified the key response variables within a lake that act as indicators of the effects of climate change on both the lake and the catchment. These variables reflect a wide range of physical, chemical, and biological responses to climate. However, the efficacy of the different indicators is affected by regional response to climate change, characteristics of the catchment, and lake mixing regimes. Thus, particular indicators or combinations of indicators are more effective for different lake types and geographic regions. The extraction of climate signals can be further complicated by the influence of other environmental changes, such as eutrophication or acidification, and the equivalent reverse phenomena, in addition to other land-use influences. In many cases, however, confounding factors can be addressed through analytical tools such as detrending or filtering. Lakes are effective sentinels for climate change because they are sensitive to climate, respond rapidly to change, and integrate information about changes in the catchment.

  • 5. Andersson, B
    et al.
    Eriksson, L
    Herlitz, E
    Persson, G
    Weyhenmeyer, Gesa
    SLU.
    Wiederholm, A-M
    Miljöövervakning i Mälarens fjärdar och sund 19992000Report (Other academic)
  • 6. Andersson, B
    et al.
    Herlitz, E
    Persson, G
    Weyhenmeyer, Gesa
    SLU.
    Wiederholm, A-M
    Miljöövervakning i Mälarens fjärdar och sund 20002001Report (Other academic)
  • 7. Andersson, B
    et al.
    Weyhenmeyer, Gesa
    SLU.
    Miljöövervakning i Mälaren 20012002Report (Other academic)
  • 8. Arnott, Shelley E.
    et al.
    Fugère, Vincent
    Symons, Celia C.
    Melles, Stephanie J.
    Beisner, Beatrix E.
    Cañedo-Argüelles, Miguel
    Hébert, Marie-Pier
    Brentrup, Jennifer A.
    Downing, Amy L.
    Gray, Derek K.
    Greco, Danielle
    Hintz, William D.
    McClymont, Alexandra
    Relyea, Rick A.
    Rusak, James A.
    Searle, Catherine L.
    Astorg, Louis
    Baker, Henry K.
    Ersoy, Zeynep
    Espinosa, Carmen
    Franceschini, Jaclyn M.
    Giorgio, Angelina T.
    Göbeler, Norman
    Hassal, Emily
    Huynh, Mercedes
    Hylander, Samuel
    Jonasen, Kacie L.
    Kirkwood, Andrea
    Langenheder, Silke
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Langvall, Ola
    Laudon, Hjalmar
    Lind, Lovisa
    Lundgren, Maria
    Moffett, Emma R.
    Proia, Lorenzo
    Schuler, Matthew S.
    Shurin, Jonathan B.
    Steiner, Christopher F.
    Striebel, Maren
    Thibodeau, Simon
    Urrutia Cordero, Pablo
    Vendrell-Puigmitja, Lidia
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Derry, Alison M.
    Widespread variation in salt tolerance within freshwater zooplankton species reduces the predictability of community-level salt tolerance2023In: Limnology and Oceanography Letters, E-ISSN 2378-2242, Vol. 8, no 1, p. 8-18Article in journal (Refereed)
    Abstract [en]

    The salinization of freshwaters is a global threat to aquatic biodiversity. We quantified variation in chloride (Cl−) tolerance of 19 freshwater zooplankton species in four countries to answer three questions: (1) How much variation in Cl− tolerance is present among populations? (2) What factors predict intraspecific variation in Cl− tolerance? (3) Must we account for intraspecific variation to accurately predict community Cl− tolerance? We conducted field mesocosm experiments at 16 sites and compiled acute LC50s from published laboratory studies. We found high variation in LC50s for Cl− tolerance in multiple species, which, in the experiment, was only explained by zooplankton community composition. Variation in species-LC50 was high enough that at 45% of lakes, community response was not predictable based on species tolerances measured at other sites. This suggests that water quality guidelines should be based on multiple populations and communities to account for large intraspecific variation in Cl− tolerance.

    Download full text (pdf)
    fulltext
  • 9. Arvola, Lauri
    et al.
    George, Glen
    Livingstone, David M.
    Järvinen, Marko
    Blenckner, Thorsten
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution.
    Dokulil, Martin T.
    Jennings, Eleanor
    Aonghusa, Caitriona Nic
    Nõges, Peeter
    Nõges, Tiina
    Weyhenmeyer, Gesa. A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    The impact of changing climate on the thermal characteristics of lakes2010In: The impact of climate change on European lakes / [ed] D.G. George, Springer , 2010, p. 85-101Chapter in book (Other academic)
  • 10. Benson, Barbara J.
    et al.
    Magnuson, John J.
    Jensen, Olaf P.
    Card, Virginia M.
    Hodgkins, Glenn
    Korhonen, Johanna
    Livingstone, David M.
    Stewart, Kenton M.
    Weyhenmeyer, Gesa
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Granin, Nick G.
    Extreme events, trends, and variability in Northern Hemisphere lake-ice phenology (1855-2005)2012In: Climatic Change, ISSN 0165-0009, E-ISSN 1573-1480, Vol. 112, no 2, p. 299-323Article in journal (Refereed)
    Abstract [en]

    Often extreme events, more than changes in mean conditions, have the greatest impact on the environment and human well-being. Here we examine changes in the occurrence of extremes in the timing of the annual formation and disappearance of lake ice in the Northern Hemisphere. Both changes in the mean condition and in variability around the mean condition can alter the probability of extreme events. Using long-term ice phenology data covering two periods 1855-6 to 2004-5 and 1905-6 to 2004-5 for a total of 75 lakes, we examined patterns in long-term trends and variability in the context of understanding the occurrence of extreme events. We also examined patterns in trends for a 30-year subset (1975-6 to 2004-5) of the 100-year data set. Trends for ice variables in the recent 30-year period were steeper than those in the 100- and 150-year periods, and trends in the 150-year period were steeper than in the 100-year period. Ranges of rates of change (days per decade) among time periods based on linear regression were 0.3-1.6 later for freeze, 0.5-1.9 earlier for breakup, and 0.7-4.3 shorter for duration. Mostly, standard deviation did not change, or it decreased in the 150-year and 100-year periods. During the recent 50-year period, standard deviation calculated in 10-year windows increased for all ice measures. For the 150-year and 100-year periods changes in the mean ice dates rather than changes in variability most strongly influenced the significant increases in the frequency of extreme lake ice events associated with warmer conditions and decreases in the frequency of extreme events associated with cooler conditions.

  • 11.
    Bjorneras, Caroline
    et al.
    Lund Univ, Dept Geol, Quaternary Sci, Lund, Sweden.;Lund Univ, Dept Biol, Aquat Ecol, Lund, Sweden..
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL. Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Hammarlund, Dan
    Lund Univ, Dept Geol, Quaternary Sci, Lund, Sweden..
    Persson, Per
    Lund Univ, Ctr Environm & Climate Res CEC, Lund, Sweden.;Lund Univ, Dept Biol, Microbial Ecol Grp, Lund, Sweden..
    Kritzberg, Emma S.
    Lund Univ, Dept Biol, Aquat Ecol, Lund, Sweden..
    Sediment Records Shed Light on Drivers of Decadal Iron Concentration Increase in a Boreal Lake2022In: Journal of Geophysical Research - Biogeosciences, ISSN 2169-8953, E-ISSN 2169-8961, Vol. 127, no 3, article id e2021JG006670Article in journal (Refereed)
    Abstract [en]

    Increasing iron (Fe) concentrations are found in lakes on a wide geographical scale but exact causes are still debated. The observed trends might result from increased Fe loading from the terrestrial catchment, but also from changes in how Fe distributes between the water column and the sediments. To get a better understanding of the causes we investigated whether there has been any change in the sediment formation of Fe sulfides (FeS) as an Fe sink in response to declining atmospheric sulfur (S) deposition during recent decades. For our study, we chose Lake Bolmen in southern Sweden, a lake for which we confirmed that Fe concentrations in the water column have strongly increased along with water color during 1966-2018. Our investigations showed that Fe accumulation and speciation varied independently of S accumulation patterns in the Lake Bolmen sediment record. Thus, we were not able to relate the positive trend in Fe concentrations to reduced FeS binding in the sediments. Furthermore, we found that Fe accumulation rates increased along with lake water Fe concentrations, indicating that increased catchment loading rather than a change in the distribution between the sediments and the water column has driven the increase in Fe concentrations. The increased loading may be due to land-use change in the form of an extensive expansion of coniferous forest during the past century. Altered forest management practices and increased precipitation may have led to enhanced weathering and erosion of organic soil layers under aging coniferous forest.

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  • 12.
    Björnerås, C.
    et al.
    Lund University, Lund, Sweden.
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Evans, C. D.
    Environm Ctr Wales, Bangor, Wales.
    Gessner, M. O.
    Leibniz Inst Freshwater Ecol & Inland Fisheries I, Stechlin, Germany; TU Berlin, Berlin, Germany.
    Grossart, H. P.
    Potsdam Univ, Potsdam, Germany.
    Kangur, K.
    Estonian Univ Life Sci, Rannu, Estonia.
    Kokorite, I.
    Univ Latvia, Riga, Latvia.
    Kortelainen, P.
    Finnish Environm Inst, Helsinki, Finland.
    Laudon, H.
    Swedish Univ Agr Sci, Umeå, Sweden.
    Lehtoranta, J.
    Finnish Environm Inst, Helsinki, Finland.
    Lottig, N.
    Univ Wisconsin, Madison, USA.
    Monteith, D. T.
    Lancaster Environm Ctr, Lancaster, England.
    Nõges, P.
    Estonian Univ Life Sci, Tartu, Estonia.
    Nõges, T.
    Estonian Univ Life Sci, Tartu, Estonia.
    Oulehle, F.
    Czech Geol Survey, Prague, Czech Republic.
    Riise, G.
    Norwegian Univ Life Sci NMBU, As, Norway.
    Rusak, J. A.
    Ontario Minist Environm & Climate Change, Dorset, Canada.
    Räike, A.
    Finnish Environm Inst, Helsinki, Finland.
    Sire, J.
    Latvian Environm Geol & Meteorol Ctr, Riga, Latvia.
    Sterling, S.
    Dalhousie Univ, Halifax, Canada.
    Kritzberg, E. S.
    Lund University, Lund, Sweden.
    Widespread Increases in Iron Concentration in European and North American Freshwaters2017In: Global Biogeochemical Cycles, ISSN 0886-6236, E-ISSN 1944-9224, Vol. 31, no 10, p. 1488-1500Article in journal (Refereed)
    Abstract [en]

    Recent reports of increasing iron (Fe) concentrations in freshwaters are of concern, given the fundamental role of Fe in biogeochemical processes. Still, little is known about the frequency and geographical distribution of Fe trends or about the underlying drivers. We analyzed temporal trends of Fe concentrations across 340 water bodies distributed over 10 countries in northern Europe and North America in order to gain a clearer understanding of where, to what extent, and why Fe concentrations are on the rise. We found that Fe concentrations have significantly increased in 28% of sites, and decreased in 4%, with most positive trends located in northern Europe. Regions with rising Fe concentrations tend to coincide with those with organic carbon (OC) increases. Fe and OC increases may not be directly mechanistically linked, but may nevertheless be responding to common regional-scale drivers such as declining sulfur deposition or hydrological changes. A role of hydrological factors was supported by covarying trends in Fe and dissolved silica, as these elements tend to stem from similar soil depths. A positive relationship between Fe increases and conifer cover suggests that changing land use and expanded forestry could have contributed to enhanced Fe export, although increases were also observed in nonforested areas. We conclude that the phenomenon of increasing Fe concentrations is widespread, especially in northern Europe, with potentially significant implications for wider ecosystem biogeochemistry, and for the current browning of freshwaters.

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  • 13.
    Björnerås, Caroline
    et al.
    Lund Univ, Dept Biol, Aquat Ecol, Solvegatan 37, S-22362 Lund, Sweden..
    Persson, Per
    Lund Univ, Dept Biol, Microbial Ecol Grp, Solvegatan 37, S-22362 Lund, Sweden.;Lund Univ, Ctr Environm & Climate Res CEC, Solvegatan 37, S-22362 Lund, Sweden..
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Hammarlund, Dan
    Lund Univ, Dept Geol, Solvegatan 12, S-22362 Lund, Sweden..
    Kritzberg, Emma S.
    Lund Univ, Dept Biol, Aquat Ecol, Solvegatan 37, S-22362 Lund, Sweden..
    The lake as an iron sink - new insights on the role of iron speciation2021In: Chemical Geology, ISSN 0009-2541, E-ISSN 1872-6836, Vol. 584, article id 120529Article in journal (Refereed)
    Abstract [en]

    The solubility and behavior of iron (Fe) in natural waters is tightly linked to Fe speciation, and Fe speciation likely influences how Fe distributes between the water column and sediments. In this study, the function of a lake as an Fe sink, with focus on the role of Fe speciation, was assessed for Lake Bolmen in southern Sweden. We found that a large fraction of the Fe flowing in to the lake was efficiently lost by sedimentation in the lake basin. Fe in inflowing water was a mix of organically complexed mononuclear Fe, Fe-(oxy)hydroxides and Fe-bearing clays, while surface sediments were composed of Fe-(oxy)hydroxides, Fe-bearing clays, Fe-bearing silicates and Fe sulfides. The absence of organically complexed Fe in the surface sediments indicates that the lake is mainly a sink for minemgenic fractions. Furthermore, while lakes are considered to be sinks of Fe, it has been suggested that this function may be impaired by increasing precipitation and consequently shorter water residence time. In this study there were large within- and between-year variations in precipitation and Fe concentrations. However, rather than smaller Fe losses to the sediments during wet years, within-lake losses tended to be larger due to higher loading of Fe from the catchment. Thus, forecasted increases in precipitation may result in enhanced catchment export and Fe loading to lakes, and subsequently enhanced Fe sequestration in sediments.

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  • 14.
    Blenckner, Thorsten
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Limnology.
    Adrian, Rita
    Arvola, Lauri
    Järvinen, Marko
    Nõges, Peeter
    Nõges, Tiina
    Pettersson, Kurt
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Limnology.
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    The impact of climate change on lakes in northern Europe2010In: The impact of climate change on European lakes / [ed] D.G. George, Springer , 2010, p. 339-358Chapter in book (Other academic)
  • 15.
    Blenckner, Thorsten
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Limnology.
    Adrian, Rita
    Livingstone, David
    Jennings, Eleanor
    Weyhenmeyer, Gesa
    George, Glen
    Jankowski, Thomas
    Ärviken, Marko
    Aonghusa, Caitriona
    Noges, Tiina
    Straile, Dietmar
    Teubner, Katrin
    Large-scale climatic signatures in lakes across Europe: A meta-analysis2007In: Global Change Biology, ISSN 1354-1013, E-ISSN 1365-2486, Vol. 13, no 7, p. 1314-1326Article in journal (Refereed)
    Abstract [en]

    Recent studies have highlighted the impact of the winter North Atlantic Oscillation (NAO) on water temperature, ice conditions, and spring plankton phenology in specific lakes and regions in Europe. Here, we use meta-analysis techniques to test whether 18 lakes in northern, western, and central Europe respond coherently to winter climate forcing, and to assess the persistence of the winter climate signal in physical, chemical, and biological variables during the year. A meta-analysis approach was chosen because we wished to emphasize the overall coherence pattern rather than individual lake responses. A particular strength of our approach is that time-series from each of the 18 lakes were subjected to the same robust statistical analysis covering the same 23-year period. Although the strongest overall coherence in response to the winter NAO was exhibited by lake water temperatures, a strong, coherent response was also exhibited by concentrations of soluble reactive phosphorus and soluble reactive silicate, most likely as a result of the coherent response exhibited by the spring phytoplankton bloom. Lake nitrate concentrations showed significant coherence in winter. With the exception of the cyanobacterial biomass in summer, phytoplankton biomass in all seasons was unrelated to the winter NAO. A strong coherence in the abundance of daphnids during spring can most likely be attributed to coherence in daphnid phenology. A strong coherence in the summer abundance of the cyclopoid copepods may have been related to a coherent change in their emergence from resting stages. We discuss the complex nature of the potential mechanisms that drive the observed changes.

  • 16.
    Blenckner, Thorsten
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Järvinen, Marko
    Dep. of Ecology and Systematic, University of Helsinki.
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Atmospheric circulation and its impact on ice phenology in Scandinavia2004In: Boreal environment research, ISSN 1239-6095, E-ISSN 1797-2469, Vol. 9, no 5, p. 371-380Article in journal (Refereed)
    Abstract [en]

    Atmospheric circulation is important in affecting surface climate and ecosystems. In this study, we compared the impact of north-atlantic and regional atmospheric circulation, as represented by the North Atlantic Oscillation (NAO) index and a set of regional circulation indices, on ice phenology of 50 Scandinavian lakes. Both ice freeze and ice break-up dates were coherent over the whole region and were significantly correlated with both types of circulation indices. Correlations were especially strong for regional circulation indices. The application of regional indices, here for the first time related with ice data over a large area, allowed the determination of the type (i.e. meridional/ zonal wind and cyclonic/anticyclonic conditions) of atmospheric circulation influencing the ice phenology. The results suggest that regional circulation indices are very useful tools, in addition to global circulation, to improve the understanding of the interaction between ecosystem processes and climate.

  • 17. Bloch, Ina
    et al.
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Long-term changes in physical and chemical conditions of nutrient-poor lakes along a latitudinal gradient: is there a coherent phytoplankton community response?2012In: Aquatic Sciences, ISSN 1015-1621, E-ISSN 1420-9055, Vol. 74, no 1, p. 77-85Article in journal (Refereed)
    Abstract [en]

    To evaluate climate and atmospheric deposition induced physical and water chemical changes and their effects on phytoplankton communities, we used complete time series (14 years, monthly measurements during the growing season) of 18 physical and chemical variables and phytoplankton data from 13 nutrient-poor Swedish reference lakes along a latitudinal gradient. We found numerous strong significant changes over time that were most coherent among lakes for sulfate concentrations, conductivity, calcium, magnesium, chloride, potassium, water color, surface water temperature and the intensity of thermal stratification. Despite these pronounced coherent physical and water chemical changes over Sweden, the phytoplankton biomass and species richness of six phytoplankton groups, measured at the same time as the water chemical variables, showed only few and weak significant changes over time. The only coherent significant change over Sweden, occurring in seven lakes, was observed in the species richness of chlorophytes. The number of chlorophyte taxa significantly declined over Sweden. Using a partial least square model for each lake, we attributed the decline primarily to an increase in water temperatures and water color, which were among the most important variables for the model performance of each lake. All other taxonomic groups were driven primarily by non-coherent changes in nutrient concentrations, pH and probably also non-coherent grazing pressure. We concluded that coherent phytoplankton responses can only be achieved for taxonomic groups that are driven primarily by coherent physical/chemical changes. According to our study, chlorophytes belong to such a group, making them possible global change indicators. Our findings give new insights into global change effects on different phytoplankton taxonomic groups in nutrient-poor lakes.

  • 18.
    Block, Benjamin D.
    et al.
    Univ Vermont, Rubenstein Ecosyst Sci Lab, Burlington, VT 05405 USA.
    Denfeld, Blaize A.
    Umea Univ, Dept Ecol & Environm Sci, Umea, Sweden.
    Stockwell, Jason D.
    Univ Vermont, Rubenstein Ecosyst Sci Lab, Burlington, VT 05405 USA.
    Flaim, Giovanna
    FEM, Res & Innovat Ctr, Dept Sustainable Agroecosyst & Bioresources, San Michele All Adige, Italy.
    Grossart, Hans-Peter F.
    Leibniz Inst Freshwater Ecol & Inland Fisheries, Dept Expt Limnol, Stechlin, Germany;Potsdam Univ, Inst Biochem & Biol, Potsdam, Germany.
    Knoll, Lesley B.
    Univ Minnesota Twin Cities, Itasca Biol Stn & Labs, Lake Itasca, MN USA.
    Maier, Dominique B.
    Umea Univ, Dept Ecol & Environm Sci, Umea, Sweden.
    North, Rebecca L.
    Univ Missouri, Sch Nat Resources, Columbia, MO USA.
    Rautio, Milla
    Univ Quebec Chicoutimi, Dept Sci Fondamentales, Chicoutimi, PQ, Canada;Univ Laval, Ctr Northern Studies CEN, Quebec City, PQ, Canada;Univ Montreal, Grp Interuniv Res Limnol & Aquat Environm GRIL, Montreal, PQ, Canada.
    Rusak, James A.
    Ontario Minist Environm & Climate Change, Dorset Environm Sci Ctr, Dorset, ON, Canada;Queens Univ, Dept Biol, Kingston, ON, Canada.
    Sadro, Steve
    Univ Calif Davis, Tahoe Environm Res Ctr, Dept Environm Sci & Policy, Davis, CA 95616 USA.
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Bramburger, Andrew J.
    Univ Minnesota, Nat Resources Res Inst, Duluth, MN 55811 USA.
    Branstrator, Donn K.
    Univ Minnesota, Dept Biol, Duluth, MN 55812 USA.
    Salonen, Kalevi
    Univ Helsinki, Lammi Biol Stn, Helsinki, Finland.
    Hampton, Stephanie E.
    Washington State Univ, Ctr Environm Res Educ & Outreach, Pullman, WA 99164 USA.
    The unique methodological challenges of winter limnology2019In: Limnology and Oceanography: Methods, E-ISSN 1541-5856, Vol. 17, no 1, p. 42-57Article, review/survey (Refereed)
    Abstract [en]

    Winter is an important season for many limnological processes, which can range from biogeochemical transformations to ecological interactions. Interest in the structure and function of lake ecosystems under ice is on the rise. Although limnologists working at polar latitudes have a long history of winter work, the required knowledge to successfully sample under winter conditions is not widely available and relatively few limnologists receive formal training. In particular, the deployment and operation of equipment in below 0 degrees C temperatures pose considerable logistical and methodological challenges, as do the safety risks of sampling during the ice-covered period. Here, we consolidate information on winter lake sampling and describe effective methods to measure physical, chemical, and biological variables in and under ice. We describe variation in snow and ice conditions and discuss implications for sampling logistics and safety. We outline commonly encountered methodological challenges and make recommendations for best practices to maximize safety and efficiency when sampling through ice or deploying instruments in ice-covered lakes. Application of such practices over a broad range of ice-covered lakes will contribute to a better understanding of the factors that regulate lakes during winter and how winter conditions affect the subsequent ice-free period.

  • 19.
    Boy, Michael
    et al.
    Univ Helsinki, Inst Atmospher & Earth Syst Res Phys, POB 64, FIN-00014 Helsinki, Finland.
    Thomson, Erik S.
    Univ Gothenburg, Dept Chem & Mol Biol Atmospher Sci, S-41296 Gothenburg, Sweden.
    Acosta Navarro, Juan-C.
    BSC, Earth Sci Dept, Barcelona, Spain.
    Arnalds, Olafur
    Agr Univ Iceland, Fac Agr & Environm Sci, Hvanneyri, Iceland.
    Batchvarova, Ekaterina
    Tech Univ Denmark, DTU Wind Energy, Riso Campus, Roskilde, Denmark;Bulgarian Acad Sci, Natl Inst Meteorol & Hydrol, Sofia, Bulgaria.
    Bäck, Jaana
    Univ Helsinki, Inst Atmospher & Earth Syst Res Forest, POB 27, FIN-00014 Helsinki, Finland.
    Berninger, Frank
    Univ Helsinki, Inst Atmospher & Earth Syst Res Forest, POB 27, FIN-00014 Helsinki, Finland.
    Bilde, Merete
    Aarhus Univ, Dept Chem, Langelandsgade 140, DK-8000 Aarhus C, Denmark.
    Brasseur, Zoe
    Univ Helsinki, Inst Atmospher & Earth Syst Res Phys, POB 64, FIN-00014 Helsinki, Finland.
    Dagsson-Waldhauserova, Pavla
    Agr Univ Iceland, Fac Agr & Environm Sci, Hvanneyri, Iceland;Univ Iceland, Dept Phys Sci, Reykjavik, Iceland;Czech Univ Life Sci, Fac Environm Sci, Prague, Czech Republic.
    Castarede, Dimitri
    Univ Gothenburg, Dept Chem & Mol Biol Atmospher Sci, S-41296 Gothenburg, Sweden.
    Dalirian, Maryam
    Stockholm Univ, Dept Environm Sci & Analyt Chem, S-10691 Stockholm, Sweden.
    de Leeuw, Gerrit
    Finnish Meteorol Inst, Climate Res Programme, Helsinki, Finland.
    Dragosics, Monika
    Univ Iceland, Inst Earth Sci, Reykjavik, Iceland.
    Duplissy, Ella-Maria
    Univ Helsinki, Inst Atmospher & Earth Syst Res Phys, POB 64, FIN-00014 Helsinki, Finland.
    Duplissy, Jonathan
    Univ Helsinki, Inst Atmospher & Earth Syst Res Phys, POB 64, FIN-00014 Helsinki, Finland.
    Ekman, Annica M. L.
    Stockholm Univ, Dept Meteorol, Stockholm, Sweden;Stockholm Univ, Bolin Ctr Climate Res, Stockholm, Sweden.
    Fang, Keyan
    Fujian Normal Univ, Inst Geog, Key Lab Humid Subtrop Ecogeog Proc, Fuzhou, Fujian, Peoples R China.
    Gallet, Jean-Charles
    Norwegian Polar Res Inst, FRAM High North Res Ctr Climate & Environm, N-9296 Tromso, Norway.
    Glasius, Marianne
    Aarhus Univ, Dept Chem, Langelandsgade 140, DK-8000 Aarhus C, Denmark.
    Gryning, Sven-Erik
    Tech Univ Denmark, DTU Wind Energy, Riso Campus, Roskilde, Denmark.
    Grythe, Henrik
    Stockholm Univ, Dept Environm Sci & Analyt Chem, S-10691 Stockholm, Sweden;NILU Norwegian Inst Air Res, Kjeller, Norway.
    Hansson, Hans-Christen
    Stockholm Univ, Dept Environm Sci & Analyt Chem, S-10691 Stockholm, Sweden.
    Hansson, Margareta
    Stockholm Univ, Dept Phys Geog, S-10691 Stockholm, Sweden.
    Isaksson, Elisabeth
    Norwegian Polar Res Inst, FRAM High North Res Ctr Climate & Environm, N-9296 Tromso, Norway.
    Iversen, Trond
    Norwegian Meteorol Inst, Oslo, Norway.
    Jonsdottir, Ingibjorg
    Univ Iceland, Inst Earth Sci, Reykjavik, Iceland.
    Kasurinen, Ville
    Univ Helsinki, Inst Atmospher & Earth Syst Res Phys, POB 64, FIN-00014 Helsinki, Finland;Univ Helsinki, Inst Atmospher & Earth Syst Res Forest, POB 27, FIN-00014 Helsinki, Finland.
    Kirkevåg, Alf
    Norwegian Meteorol Inst, Oslo, Norway.
    Korhola, Atte
    Univ Helsinki, Fac Biol & Environm Sci, Ecosyst & Environm Res Programme, ECRU, POB 65, FIN-00014 Helsinki, Finland.
    Krejci, Radovan
    Stockholm Univ, Dept Environm Sci & Analyt Chem, S-10691 Stockholm, Sweden.
    Kristjansson, Jon Egill
    Univ Oslo, Dept Geosci, Oslo, Norway.
    Lappalainen, Hanna K.
    Univ Helsinki, Inst Atmospher & Earth Syst Res Phys, POB 64, FIN-00014 Helsinki, Finland;Finnish Meteorol Inst, Climate Res Programme, Helsinki, Finland;Tyumen State Univ, Dept Cryosphere, Tyumen 625003, Russia.
    Lauri, Antti
    Univ Helsinki, Inst Atmospher & Earth Syst Res Phys, POB 64, FIN-00014 Helsinki, Finland.
    Leppäranta, Matti
    Univ Helsinki, Inst Atmospher & Earth Syst Res Phys, POB 64, FIN-00014 Helsinki, Finland.
    Lihavainen, Heikki
    Finnish Meteorol Inst, Climate Res Programme, Helsinki, Finland.
    Makkonen, Risto
    Univ Helsinki, Inst Atmospher & Earth Syst Res Phys, POB 64, FIN-00014 Helsinki, Finland.
    Massling, Andreas
    Aarhus Univ, Arct Res Ctr, Dept Environm Sci, Climate, Frederiksborgvej 399, DK-4000 Roskilde, Denmark.
    Meinander, Outi
    Finnish Meteorol Inst, Climate Res Programme, Helsinki, Finland.
    Nilsson, E. Douglas
    Stockholm Univ, Dept Environm Sci & Analyt Chem, S-10691 Stockholm, Sweden.
    Olafsson, Haraldur
    Univ Iceland, Dept Phys Sci, Reykjavik, Iceland;Icelandic Meteorol Off, Reykjavik, Iceland.
    Pettersson, Jan B. C.
    Univ Gothenburg, Dept Chem & Mol Biol Atmospher Sci, S-41296 Gothenburg, Sweden.
    Prisle, Nonne L.
    Univ Oulu, Nano & Mol Syst Res Unit, POB 3000, Oulu 90014, Finland.
    Riipinen, Ilona
    Stockholm Univ, Dept Environm Sci & Analyt Chem, S-10691 Stockholm, Sweden.
    Roldin, Pontus
    Lund Univ, Dept Phys, Div Nucl Phys, POB 118, S-22100 Lund, Sweden.
    Ruppel, Meri
    Univ Helsinki, Fac Biol & Environm Sci, Ecosyst & Environm Res Programme, ECRU, POB 65, FIN-00014 Helsinki, Finland.
    Salter, Matthew
    Stockholm Univ, Dept Environm Sci & Analyt Chem, S-10691 Stockholm, Sweden.
    Sand, Maria
    CICERO, Oslo, Norway.
    Seland, Öyvind
    Norwegian Meteorol Inst, Oslo, Norway.
    Seppä, Heikki
    Univ Helsinki, Dept Geosci & Geog, Helsinki, Finland.
    Skov, Henrik
    Aarhus Univ, Arct Res Ctr, Dept Environm Sci, Climate, Frederiksborgvej 399, DK-4000 Roskilde, Denmark.
    Soares, Joana
    Finnish Meteorol Inst, Climate Res Programme, Helsinki, Finland;Air Qual Res Div Environm & Climate Change Canada, Toronto, ON M3H5T4, Canada.
    Stohl, Andreas
    NILU Norwegian Inst Air Res, Kjeller, Norway.
    Ström, Johan
    Stockholm Univ, Dept Environm Sci & Analyt Chem, S-10691 Stockholm, Sweden.
    Svensson, Jonas
    Finnish Meteorol Inst, Climate Res Programme, Helsinki, Finland.
    Swietlicki, Erik
    Lund Univ, Dept Phys, Div Nucl Phys, POB 118, S-22100 Lund, Sweden.
    Tabakova, Ksenia
    Univ Helsinki, Inst Atmospher & Earth Syst Res Phys, POB 64, FIN-00014 Helsinki, Finland.
    Thorsteinsson, Throstur
    Univ Iceland, Inst Earth Sci, Reykjavik, Iceland;Univ Iceland, Environm & Nat Resources, Reykjavik, Iceland.
    Virkkula, Aki
    Univ Helsinki, Inst Atmospher & Earth Syst Res Phys, POB 64, FIN-00014 Helsinki, Finland;Finnish Meteorol Inst, Climate Res Programme, Helsinki, Finland.
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Wu, Yusheng
    Univ Helsinki, Inst Atmospher & Earth Syst Res Phys, POB 64, FIN-00014 Helsinki, Finland.
    Zieger, Paul
    Stockholm Univ, Dept Environm Sci & Analyt Chem, S-10691 Stockholm, Sweden.
    Kulmala, Markku
    Univ Helsinki, Inst Atmospher & Earth Syst Res Phys, POB 64, FIN-00014 Helsinki, Finland.
    Interactions between the atmosphere, cryosphere, and ecosystems at northern high latitudes2019In: Atmospheric Chemistry And Physics, ISSN 1680-7316, E-ISSN 1680-7324, Vol. 19, no 3, p. 2015-2061Article in journal (Refereed)
    Abstract [en]

    The Nordic Centre of Excellence CRAICC (Cryosphere-Atmosphere Interactions in a Changing Arctic Climate), funded by NordForsk in the years 2011-2016, is the largest joint Nordic research and innovation initiative to date, aiming to strengthen research and innovation regarding climate change issues in the Nordic region. CRAICC gathered more than 100 scientists from all Nordic countries in a virtual centre with the objectives of identifying and quantifying the major processes controlling Arctic warming and related feedback mechanisms, outlining strategies to mitigate Arctic warming, and developing Nordic Earth system modelling with a focus on short-lived climate forcers (SLCFs), including natural and anthropogenic aerosols. The outcome of CRAICC is reflected in more than 150 peer-reviewed scientific publications, most of which are in the CRAICC special issue of the journal Atmospheric Chemistry and Physics. This paper presents an overview of the main scientific topics investigated in the centre and provides the reader with a state-of-the-art comprehensive summary of what has been achieved in CRAICC with links to the particular publications for further detail. Faced with a vast amount of scientific discovery, we do not claim to completely summarize the results from CRAICC within this paper, but rather concentrate here on the main results which are related to feedback loops in climate change-cryosphere interactions that affect Arctic amplification.

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  • 20. Carrea, L.
    et al.
    Iestyn Woolway, I.
    Merchant, C.
    Dokulil, M.T.
    De Gasperi, C.L.
    de Eyto, E.
    Kelly, S.
    La Fuente, R.S.
    Marszelewski, W.
    May, L.
    Paterson, A.M.
    Pulkkanen, M.
    Rusak, J.A.
    Rusanovskaya, O.
    Schladow, S.G.
    Schmid, M.
    Shimaraeva, S.V.
    Silow, E.A.
    Timofeyev, M.A.
    Verburg, P.
    Watanabe, S.
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Lake surface temperature: in State of the Climate in 20192020In: Bulletin of The American Meteorological Society - (BAMS), ISSN 0003-0007, E-ISSN 1520-0477, Vol. 101, no 8: S1, p. S26-S28Article in journal (Refereed)
  • 21.
    Chen, Deliang
    et al.
    Univ Gothenburg, Dept Earth Sci, Gothenburg, Sweden.;Royal Swedish Acad Sci, Stockholm, Sweden..
    Rodhe, Henning
    Royal Swedish Acad Sci, Stockholm, Sweden.;Stockholm Univ, Dept Meteorol, Stockholm, Sweden.;Ctr Nat Hazard & Disaster Sci, Uppsala, Sweden..
    Emanuel, Kerry
    MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA USA..
    Seneviratne, Sonia, I
    Swiss Fed Inst Technol, Inst Atmospher & Climate Sci, Zurich, Switzerland..
    Zhai, Panmao
    Chinese Acad Meteorol Sci, Beijing, Peoples R China..
    Allard, Bert
    Royal Swedish Acad Sci, Stockholm, Sweden.;Orebro Univ, Sch Sci & Technol, Orebro, Sweden..
    Berg, Peter
    Swedish Meteorol & Hydrol Inst SMHI, Norrkoping, Sweden..
    Bjorck, Svante
    Royal Swedish Acad Sci, Stockholm, Sweden.;Lund Univ, Dept Geol, Lund, Sweden..
    Brown, Ian A.
    Stockholm Univ, Dept Phys Geog, Stockholm, Sweden.;Stockholm Univ, Bolin Ctr Climate Res, Stockholm, Sweden..
    Barring, Lars
    Swedish Meteorol & Hydrol Inst SMHI, Norrkoping, Sweden..
    Chafik, Leon
    Stockholm Univ, Dept Meteorol, Stockholm, Sweden.;Stockholm Univ, Bolin Ctr Climate Res, Stockholm, Sweden..
    Deng, Kaiqiang
    Univ Gothenburg, Dept Earth Sci, Gothenburg, Sweden..
    Gaillard-Lemdahl, Marie-Jose
    Royal Swedish Acad Sci, Stockholm, Sweden.;Linnaeus Univ, Dept Biol & Environm Sci, Kalmar, Sweden..
    Hieronymus, Magnus
    Swedish Meteorol & Hydrol Inst SMHI, Norrkoping, Sweden..
    Kjellstrom, Erik
    Swedish Meteorol & Hydrol Inst SMHI, Norrkoping, Sweden.;Stockholm Univ, Bolin Ctr Climate Res, Stockholm, Sweden..
    Linderholm, Hans W.
    Univ Gothenburg, Dept Earth Sci, Gothenburg, Sweden..
    May, Wilhelm
    Lund Univ, Ctr Environm & Climate Res, Lund, Sweden..
    Naslund, Jens-Ove
    Swedish Nucl Fuel & Waste Management Co, Stockholm, Sweden..
    Ou, Tinghai
    Univ Gothenburg, Dept Earth Sci, Gothenburg, Sweden..
    Rutgersson, Anna
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL. Ctr Nat Hazard & Disaster Sci, Uppsala, Sweden..
    Sahlée, Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Schenk, Frederik
    Stockholm Univ, Bolin Ctr Climate Res, Stockholm, Sweden.;Stockholm Univ, Dept Geol Sci, Stockholm, Sweden..
    Sjolte, Jesper
    Lund Univ, Dept Geol, Lund, Sweden..
    Sporre, Moa K.
    Lund Univ, Dept Phys, Lund, Sweden..
    Stigebrandt, Anders
    Royal Swedish Acad Sci, Stockholm, Sweden.;Univ Gothenburg, Dept Marine Sci, Gothenburg, Sweden..
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Royal Swedish Acad Sci, Stockholm, Sweden..
    Zhang, Peng
    Univ Gothenburg, Dept Earth Sci, Gothenburg, Sweden..
    Zhang, Qiong
    Stockholm Univ, Dept Phys Geog, Stockholm, Sweden.;Stockholm Univ, Bolin Ctr Climate Res, Stockholm, Sweden..
    Summary of a workshop on extreme weather events in a warming world organized by the Royal Swedish Academy of Sciences2020In: Tellus. Series B, Chemical and physical meteorology, ISSN 0280-6509, E-ISSN 1600-0889, Vol. 72, no 1, article id 1794236Article in journal (Other academic)
    Abstract [en]

    Climate change is not only about changes in means of climatic variables such as temperature, precipitation and wind, but also their extreme values which are of critical importance to human society and ecosystems. To inspire the Swedish climate research community and to promote assessments of international research on past and future changes in extreme weather events against the global climate change background, the Earth Science Class of the Royal Swedish Academy of Sciences organized a workshop entitled 'Extreme weather events in a warming world' in 2019. This article summarizes and synthesizes the key points from the presentations and discussions of the workshop on changes in floods, droughts, heat waves, as well as on tropical cyclones and extratropical storms. In addition to reviewing past achievements in these research fields and identifying research gaps with a focus on Sweden, future challenges and opportunities for the Swedish climate research community are highlighted.

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  • 22.
    Creed, Irena F.
    et al.
    Univ Saskatchewan, Sch Environm & Sustainabil, Saskatoon, SK, Canada.
    Bergstrom, Ann-Kristin
    Umea Univ, Dept Ecol & Environm Sci, Umea, Sweden.
    Trick, Charles G.
    Western Univ, Interfac Program Publ Hlth, London, ON, Canada;Western Univ, Dept Biol, London, ON, Canada.
    Grimm, Nancy B.
    Arizona State Univ, Sch Life Sci, Tempe, AZ USA.
    Hessen, Dag O.
    Univ Oslo, Sect Aquat Biol & Toxicol, Oslo, Norway.
    Karlsson, Jan
    Umea Univ, Climate Impacts Res Ctr, Dept Ecol & Environm Sci, Umea, Sweden.
    Kidd, Karen A.
    Univ New Brunswick, Dept Biol, St John, NB, Canada;Univ New Brunswick, Canadian Rivers Inst, St John, NB, Canada.
    Kritzberg, Emma
    Lund Univ, Dept Biol, Lund, Sweden.
    McKnight, Diane M.
    Univ Colorado, INSTAAR, Boulder, CO 80309 USA.
    Freeman, Erika C.
    Western Univ, Dept Geog, London, ON, Canada.
    Senar, Oscar E.
    Western Univ, Dept Geog, London, ON, Canada.
    Andersson, Agneta
    Umea Univ, Dept Ecol & Environm Sci, Umea, Sweden.
    Ask, Jenny
    Umea Univ, Dept Ecol & Environm Sci, Umea, Sweden.
    Berggren, Martin
    Lund Univ, Dept Phys Geog & Ecosyst Sci, Lund, Sweden.
    Cherif, Mehdi
    Umea Univ, Dept Ecol & Environm Sci, Umea, Sweden.
    Giesler, Reiner
    Umea Univ, Climate Impacts Res Ctr, Dept Ecol & Environm Sci, Umea, Sweden.
    Hotchkiss, Erin R.
    Virginia Polytech Inst & State Univ, Dept Biol Sci, Blacksburg, VA 24061 USA.
    Kortelainen, Pirkko
    Finnish Environm Inst, Helsinki, Finland.
    Palta, Monica M.
    Arizona State Univ, Sch Life Sci, Tempe, AZ USA.
    Vrede, Tobias
    Swedish Univ Agr Sci, Dept Aquat Sci & Assessment, Uppsala, Sweden.
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Global change-driven effects on dissolved organic matter composition: Implications for food webs of northern lakes2018In: Global Change Biology, ISSN 1354-1013, E-ISSN 1365-2486, Vol. 24, no 8, p. 3692-3714Article, review/survey (Refereed)
    Abstract [en]

    Northern ecosystems are experiencing some of the most dramatic impacts of global change on Earth. Rising temperatures, hydrological intensification, changes in atmospheric acid deposition and associated acidification recovery, and changes in vegetative cover are resulting in fundamental changes in terrestrial-aquatic biogeochemical linkages. The effects of global change are readily observed in alterations in the supply of dissolved organic matter (DOM)-the messenger between terrestrial and lake ecosystems-with potentially profound effects on the structure and function of lakes. Northern terrestrial ecosystems contain substantial stores of organic matter and filter or funnel DOM, affecting the timing and magnitude of DOM delivery to surface waters. This terrestrial DOM is processed in streams, rivers, and lakes, ultimately shifting its composition, stoichiometry, and bioavailability. Here, we explore the potential consequences of these global change-driven effects for lake food webs at northern latitudes. Notably, we provide evidence that increased allochthonous DOM supply to lakes is overwhelming increased autochthonous DOM supply that potentially results from earlier ice-out and a longer growing season. Furthermore, we assess the potential implications of this shift for the nutritional quality of autotrophs in terms of their stoichiometry, fatty acid composition, toxin production, and methylmercury concentration, and therefore, contaminant transfer through the food web. We conclude that global change in northern regions leads not only to reduced primary productivity but also to nutritionally poorer lake food webs, with discernible consequences for the trophic web to fish and humans.

  • 23. Daneshvar, Atlasi
    et al.
    Aboulfadl, Khadija
    Viglino, Liza
    Broseus, Romain
    Sauve, Sebastien
    Madoux-Humery, Anne-Sophie
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Prevost, Michele
    Evaluating pharmaceuticals and caffeine as indicators of fecal contamination in drinking water sources of the Greater Montreal region2012In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 88, no 1, p. 131-139Article in journal (Refereed)
    Abstract [en]

    We surveyed four different river systems in the Greater Montreal region, upstream and downstream of entry points of contamination, from April 2007 to January 2009. The studied compounds belong to three different groups: PPCPs (caffeine, carbamazepine, naproxen, gemfibrozil, and trimethoprim), hormones (progesterone, estrone, and estradiol), and triazine herbicides and their metabolites (atrazine, deethylatrazine, deisopropylatrazine, simazine, and cyanazine). In the system A. B, and C having low flow rate and high TOC, we observed the highest detection frequencies and mass flows of PPCPs compared to the other compounds, reflecting discharge of urban contaminations through WWTPs and CSOs. However, in River D, having high flow rate and low TOC, comparable frequency of detection of triazine and their by-products and PPCPs, reflecting cumulative loads of these compounds from the Great Lakes as well as persistency against natural attenuation processes. Considering large differences in the removal efficiencies of caffeine and carbamazepine, a high ratio of caffeine/carbamazepine might be an indicative of a greater proportion of raw sewage versus treated wastewater in surface waters. In addition, caffeine appeared to be a promising indicator of recent urban fecal contaminations, as shown by the significant correlation with FC (R-2 = 0.45), while carbamazepine is a good indicator of cumulative persistence compounds.

  • 24. Daneshvar, Atlasi
    et al.
    Svanfelt, Jesper
    Kronberg, Leif
    Prévost, Michele
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Limnology.
    Seasonal variations in the occurrence and fate of basic and neutral pharmaceuticals in a Swedish river-lake system2010In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 80, no 3, p. 301-309Article in journal (Refereed)
    Abstract [en]

    The seasonal variations in the occurrence of carbamazepine, atenolol, metoprolol, sotalol, and acebutolol were studied at seven sites along River Fyris from December 2007 to December 2008. Samples were collected from the effluent of a waste water treatment plant (WWTP), at one upstream site, and five downstream sites of the WWTP). During one occasion in May 2008, water samples were collected at different locations and depths in the recipient lake. All analytes except of acebutolol were present in both the river and the lake at quantifiable amounts at all sampling occasions. Carbamazepine was found in similar concentrations (about 90 ng L-1) at all sampling sites and all studied depths (0.5-40 m) in the lake, indicating high environmental persistence of this compound. A clear seasonal pattern was observed for the natural attenuation of the beta-blockers in the river, with the highest attenuation occurring in summer and the lowest in winter. The loss of beta-blockers on a distance of 1320 m reached up to 75% during summer time but was insignificant during winter. The seasonal variations in the loss followed the seasonal variations in water temperature and chlorophyll a mass flow suggesting that biotransformation and adsorption are the main processes responsible for the loss of the studied pharmaceuticals in River Fyris downstream the WWTP.

  • 25. Daneshvar, Atlasi
    et al.
    Svanfelt, Jesper
    Kronberg, Leif
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Neglected sources of pharmaceuticals in river water: footprints of a Reggae festival2012In: Journal of Environmental Monitoring, ISSN 1464-0325, E-ISSN 1464-0333, Vol. 14, no 2, p. 596-603Article in journal (Refereed)
    Abstract [en]

    Wastewater treatment plants (WWTPs) are commonly considered as the main source of pharmaceuticals in surface waters. Here, however, we show that an open-air festival, attracting approximately 10 000 visitors per year at the shores of River Fyris upstream of Uppsala WWTP, can temporarily result in a higher pharmaceutical input into the river water than the WWTP. Studying the influence of Uppsala Reggae festival on the occurrence of ten commonly used acidic and basic pharmaceuticals upstream, in the effluent, and downstream of the Uppsala WWTP, we found that occasional heavy rainfalls during the festival in 2008 severely increased the mass flows of all pharmaceuticals at the WWTP upstream site. Also, strong increases in ammonium (210-fold), nitrate (21-fold), and total nitrogen (21-fold) mass flows were observed. The pharmaceutical mass flows at the upstream site were up to 3.4 times higher than those observed in the WWTP effluent. In contrast, in 2009, the festival was not accompanied with rainfalls and no major additional input of pharmaceuticals and nitrogen was observed. The findings of this study give new insights into risk assessments and are relevant for monitoring programmes.

  • 26. Daneshvar, Atlasi
    et al.
    Svanfelt, Jesper
    Kronberg, Leif
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Limnology.
    Winter accumulation of acidic pharmaceuticals in a Swedish river2010In: Environmental Science and Pollution Research, ISSN 0944-1344, E-ISSN 1614-7499, Vol. 17, no 4, p. 908-916Article in journal (Refereed)
    Abstract [en]

    In this study, seasonal variations in the concentration profile of four analgesics and one lipid regulator were monitored on their way from a wastewater treatment plant (WWTP) effluent, along a river, and into a lake. From December 2007 to December 2008, water samples were collected monthly (n = 12) from an upstream point, the effluent, four downstream points of the WWTP, and at the point where the river merges with the lake, and the concentrations of ibuprofen, naproxen, bezafibrate, diclofenac, and ketoprofen were determined. The analytical methodology involved solid-phase extraction of the target compounds from water samples followed by liquid chromatography coupled with tandem mass spectrometry for compound separation and detection. The studied pharmaceuticals were found in the effluent at concentrations ranging from 31 to 1,852 ng l(-1) depending on the season. In the river and lake, the concentrations were much lower (6-400 ng l(-1)) mainly due to dilution but also to a season-dependent contribution from natural transformation processes. The mean mass flow of all analgesics was highest during winter while the highest mean mass flow of the lipid regulator bezafibrate was observed in spring. The WWTP is the main source of the target compounds in the aquatic environment. The observed winter accumulation signifies the importance of natural transformation processes, which can only be estimated based on mass flow data, on the fate of pharmaceuticals in the environment.

  • 27.
    Denfeld, Blaize A.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Wallin, Marcus B.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Sahlée, Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Sobek, Sebastian
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Kokic, Jovana
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Chmiel, Hannah E.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Temporal and spatial carbon dioxide concentration patterns in a small boreal lake in relation to ice cover dynamics2015In: Boreal environment research, ISSN 1239-6095, E-ISSN 1797-2469, Vol. 20, no 6, p. 679-692Article in journal (Refereed)
    Abstract [en]

    Global carbon dioxide (CO2) emission estimates from inland waters commonly neglect the ice-cover season. To account for CO2 accumulation below ice and consequent emissions into the atmosphere at ice-melt we combined automatically-monitored and manually- sampled spatially-distributed CO2 concentration measurements from a small boreal ice-covered lake in Sweden. In early winter, CO2 accumulated continuously below ice, whereas, in late winter, CO2 concentrations remained rather constant. At ice-melt, two CO2 concentration peaks were recorded, the first one reflecting lateral CO2 transport within the upper water column, and the second one reflecting vertical CO2 transport from bottom waters. We estimated that 66%–85% of the total CO2 accumulated in the water below ice left the lake at ice-melt, while the remainder was stored in bottom waters. Our results imply that CO2 accumulation under ice and emissions at ice-melt are more dynamic than previously reported, and thus need to be more accurately integrated into annual CO2 emission estimates from inland waters.

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  • 28.
    Denfeld, Blaize
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Kortelainen, Pirkko
    Finnish Environment Institute.
    Rantakari, Miitta
    Department of Environmental Sciences, University of Helsinki.
    Sobek, Sebastian
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Weyhenmeyer, Gesa
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Regional Variability and Drivers of Below Ice CO2 in Boreal and Subarctic Lakes2016In: Ecosystems (New York. Print), ISSN 1432-9840, E-ISSN 1435-0629, Vol. 19, no 3, p. 461-476Article in journal (Refereed)
    Abstract [en]

    Northern lakes are ice-covered for considerable portions of the year, where carbon dioxide (CO2) can accumulate below ice, subsequently leading to high CO2 emissions at ice-melt. Current knowledge on the regional control and variability of below ice partial pressure of carbon dioxide (pCO(2)) is lacking, creating a gap in our understanding of how ice cover dynamics affect the CO2 accumulation below ice and therefore CO2 emissions from inland waters during the ice-melt period. To narrow this gap, we identified the drivers of below ice pCO(2) variation across 506 Swedish and Finnish lakes using water chemistry, lake morphometry, catchment characteristics, lake position, and climate variables. We found that lake depth and trophic status were the most important variables explaining variations in below ice pCO(2) across the 506 lakes(.) Together, lake morphometry and water chemistry explained 53% of the site-to-site variation in below ice pCO(2). Regional climate (including ice cover duration) and latitude only explained 7% of the variation in below ice pCO(2). Thus, our results suggest that on a regional scale a shortening of the ice cover period on lakes may not directly affect the accumulation of CO2 below ice but rather indirectly through increased mobility of nutrients and carbon loading to lakes. Thus, given that climate-induced changes are most evident in northern ecosystems, adequately predicting the consequences of a changing climate on future CO2 emission estimates from northern lakes involves monitoring changes not only to ice cover but also to changes in the trophic status of lakes.

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  • 29.
    Denfeld, Blaize
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Umea Univ, Dept Ecol & Environm Sci, Umea, Sweden.
    Ricão Canelhas, Monica
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Weyhenmeyer, Gesa
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Bertilsson, Stefan
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Science for Life Laboratory, SciLifeLab.
    Eiler, Alexander
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Bastviken, David
    Linköping University, Department of Thematic Studies – Environmental Change .
    Constraints on methane oxidation in ice-covered boreal lakes2016In: Journal of Geophysical Research - Biogeosciences, ISSN 2169-8953, E-ISSN 2169-8961, Vol. 121, no 7, p. 1924-1933Article in journal (Refereed)
    Abstract [en]

    Boreal lakes can be ice covered for a substantial portion of the year at which time methane (CH4) can accumulate below ice. The amount of CH4 emitted at ice melt is partially determined by the interplay between CH4 production and CH4 oxidation, performed by methane-oxidizing bacteria (MOB). Yet the balance between oxidation and emission and the potential for CH4 oxidation in various lakes during winter is largely unknown. To address this, we performed incubations at 2 degrees C to screen for wintertime CH4 oxidation potential in seven lakes. Results showed that CH4 oxidation was restricted to three lakes, where the phosphate concentrations were highest. Molecular analyses revealed that MOB were initially detected in all lakes, although an increase in type I MOB only occurred in the three lake water incubations where oxidation could be observed. Accordingly, the increase in CO2 was on average 5 times higher in these three lake water incubations. For one lake where no oxidation was measured, we tested if temperature and CH4 availability could trigger CH4 oxidation. However, regardless of incubation temperatures and CH4 concentrations, ranging from 2 to 20 degrees C and 1-500M, respectively, no oxidation was observed. Our study indicates that some lakes with active wintertime CH4 oxidation may have low emissions during ice melt, while other and particularly nutrient poor lakes may accumulate large amounts of CH4 below ice that, in the absence of CH4 oxidation, will be emitted following ice melt. This variability in CH4 oxidation rates between lakes needs to be accounted for in large-scale CH4 emission estimates.

  • 30.
    Dokulil, Martin T.
    et al.
    Univ Innsbruck, Res Dept Limnol, Mondsee, Austria..
    de Eyto, Elvira
    Inst Marine, Furnace, Newport, Ireland..
    Maberly, Stephen C.
    UK Ctr Ecol & Hydrol, Lancaster, England..
    May, Linda
    UK Ctr Ecol & Hydrol, Edinburgh, Midlothian, Scotland..
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Woolway, R. Iestyn
    European Space Agcy, ECSAT, Climate Off, Harwell Campus, Didcot, Oxon, England..
    Increasing maximum lake surface temperature under climate change2021In: Climatic Change, ISSN 0165-0009, E-ISSN 1573-1480, Vol. 165, no 3-4, article id 56Article in journal (Refereed)
    Abstract [en]

    Annual maximum lake surface temperature influences ecosystem structure and function and, in particular, the rates of metabolic activities, species survival and biogeography. Here, we evaluated 50 years of observational data, from 1966 to 2015, for ten European lakes to quantify changes in the annual maximum surface temperature and the duration above a potentially critical temperature of 20 degrees C. Our results show that annual maximum lake surface temperature has increased at an average rate of +0.58 degrees C decade(-1) (95% confidence interval 0.18), which is similar to the observed increase in annual maximum air temperature of +0.42 degrees C decade(-1) (95% confidence interval 0.28) over the same period. Increments in lake maximum temperature among the ten lakes range from +0.1 in the west to +1.9 degrees C decade(-1) in the east. Absolute maximum lake surface water temperatures were reached in Worthersee, 27.5 degrees C, and Neusiedler See, 31.7 degrees C. Periods exceeding a critical temperature of 20 degrees C each year became two to six times longer than the respective average (6 to 93). The depth at which water temperature exceeded 20 degrees C increased from less than 1 to more than 6 m in Mondsee, Austria, over the 50 years studied. As a consequence, the habitable environment became increasingly restricted for many organisms that are adapted to historic conditions.

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  • 31.
    Eklöf, Karin
    et al.
    SLU Department of Aquatic Sciences and Assessment.
    Kraus, Andrea
    SLU Department of Aquatic Sciences and Assessment.
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Meili, Markus
    Stockholm University.
    Bishop, Kevin
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Forestry Influence by Stump Harvest and Site Preparation on Methylmercury, Total Mercury and Other Stream Water Chemistry Parameters Across a Boreal Landscape2012In: Ecosystems (New York. Print), ISSN 1432-9840, E-ISSN 1435-0629, Vol. 15, no 8, p. 1308-1320Article in journal (Refereed)
    Abstract [en]

    Forestry has been reported to cause elevated mercury (Hg) concentrations in runoff water. However, the degree to which forestry operations influence Hg in runoff varies among sites. A synoptic study, covering 54 catchments distributed all over Sweden, subjected to either stump harvest (SH), site preparation (SP) or no treatment (Ref), was undertaken to reveal the degree of forestry impact and causes of eventual variation. All streams were sampled twice, in autumn 2009 and summer 2010. There were no significant differences in total mercury (THg) and methylmercury (MeHg) concentrations between the three treatments in either 2009 or 2010. However, when pooling the treated catchments (that is, SH and SP) and taking catchment properties such as latitude into account, the treatment had a significant influence on the THg and MeHg concentrations. Although the treatment effect on THg and MeHg did not differ between SH and SP, the study did reveal significant forestry effects on potassium (K) and total nitrogen (TN) that were greater in the SH catchments and lower in the SP catchments. Partial least square (PLS) regressions indicated that organic matter was the most important variable influencing both the THg and MeHg concentrations. There were no significant differences between the treatment groups when comparing the ratios of THg/total organic carbon (TOC) and MeHg/TOC, suggesting that the high concentrations of THg and MeHg observed at some of the treated catchments are associated with increased concentrations of TOC rather than new methylation or increased mobilization caused by factors other than TOC.

  • 32.
    Engel, Fabian
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Attermeyer, Katrin
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Ayala, Ana I
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Fischer, Helmut
    Kirchesch, Volker
    Pierson, Don
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Phytoplankton gross primary production increases along cascading impoundments in a temperate, low-discharge river: Insights from high frequency water quality monitoring2019In: Scientific Reports, E-ISSN 2045-2322, Vol. 9, article id 6701Article in journal (Refereed)
    Abstract [en]

    Damming alters carbon processing along river continua. Estimating carbon transport along rivers intersected by multiple dams requires an understanding of the effects of cascading impoundments on the riverine metabolism. We analyzed patterns of riverine metabolism and phytoplankton biomass (chlorophyll a; Chla) along a 74.4-km river reach intersected by six low-head navigation dams. Calculating gross primary production (GPP) from continuous measurements of dissolved oxygen concentration, we found a maximum increase in the mean GPP by a factor of 3.5 (absolute difference of 0.45 g C m−3 d−1) along the first 26.5 km of the study reach, while Chla increased over the entire reach by a factor of 2.9 (8.7 µg l−1). In the intermittently stratified section of the deepest impoundment the mean GPP between the 1 and 4 m water layer differed by a factor of 1.4 (0.31 g C m−3 d−1). Due to the strong increase in GPP, the river featured a wide range of conditions characteristic of low- to medium-production rivers. We suggest that cascading impoundments have the potential to stimulate riverine GPP, and conclude that phytoplankton CO2 uptake is an important carbon flux in the river Saar, where a considerable amount of organic matter is of autochthonous origin.

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  • 33.
    Engel, Fabian
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Attermeyer, Katrin
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. WasserCluster Lunz – Biologische Station GmbH.
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    A simplified approach to detect a significant carbon dioxide reduction by phytoplankton in lakes and rivers on a regional and global scale2020In: The Science of Nature: Naturwissenschaften, ISSN 0028-1042, E-ISSN 1432-1904, Vol. 107, no 4, article id 29Article in journal (Refereed)
    Abstract [en]

    Carbon dioxide (CO2) uptake by phytoplankton can significantly reduce the partial pressure of CO2 (pCO2) in lakes and rivers, and thereby CO2 emissions. Presently, it is not known in which inland waters on Earth a significant pCO2 reduction by phytoplankton is likely. Since detailed, comparable carbon budgets are currently not available for most inland waters, we modified a proxy to assess the pCO2 reduction by phytoplankton, originally developed for boreal lakes, for application on a global scale. Using data from 61 rivers and 125 lakes distributed over five continents, we show that a significant pCO2 reduction by phytoplankton is widespread across the temperate and sub-/tropical region, but absent in the cold regions on Earth. More specifically, we found that a significant pCO2 reduction by phytoplankton might occur in 24% of the lakes in the temperate region, and 39% of the lakes in the sub-/tropical region. We also showed that such a reduction might occur in 21% of the rivers in the temperate region, and 5% of the rivers in the sub-/tropical region. Our results indicate that CO2 uptake by phytoplankton is a relevant flux in regional and global carbon budgets. This highlights the need for more accurate approaches to quantify CO2 uptake by primary producers in inland waters, particularly in the temperate and sub-/tropical region.

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  • 34.
    Engel, Fabian
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Drakare, Stina
    Swedish Univ Agr Sci SLU, Dept Aquat Sci & Assessment, POB 7050, S-75007 Uppsala, Sweden.
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Environmental conditions for phytoplankton influenced carbon dynamics in boreal lakes2019In: Aquatic Sciences, ISSN 1015-1621, E-ISSN 1420-9055, Vol. 81, no 2, article id 35Article in journal (Refereed)
    Abstract [en]

    The partial pressure of CO2 (pCO(2)) in lake water, and thus CO2 emissions from lakes are controlled by hydrologic inorganic carbon inputs into lakes, and in-lake carbon transformation (mainly organic carbon mineralization and CO2 uptake by primary producers). In boreal lakes, CO2 uptake by phytoplankton is often considered to be of minor importance. At present, however, it is not known in which and how many boreal lakes phytoplankton CO2 uptake has a sizeable influence on the lake water pCO(2). Using water physico-chemical and phytoplankton data from 126 widely spread Swedish lakes from 1992 to 2012, we found that pCO(2) was negatively related to phytoplankton carbon in lakes in which the phytoplankton share in TOC (C-phyto:TOC ratio) exceeded 5%. Total phosphorus concentration (TP) was the strongest predictor of spatial variation in the C-phyto:TOC ratio, where C-phyto:TOC ratios>5% occurred in lakes with TP>30 mu gl(-1). These lakes were located in the hemi-boreal zone of central and southern Sweden. We conclude that during summer, phytoplankton CO2 uptake can reduce the pCO(2) not only in warm eutrophic lakes, but also in relatively nutrient poor hemi-boreal lakes.

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  • 35.
    Engel, Fabian
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Farrell, Kaitlin J.
    McCullough, Ian M.
    Scordo, Facundo
    Denfeld, Blaize A.
    Dugan, Hilary A.
    de Eyto, Elvira
    Hanson, Paul C.
    McClure, Ryan P.
    Nõges, Peeter
    Nõges, Tiina
    Ryder, Elizabeth
    Weathers, Kathleen C.
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    A lake classification concept for a more accurate global estimate of the dissolved inorganic carbon export from terrestrial ecosystems to inland waters2018In: The Science of Nature: Naturwissenschaften, ISSN 0028-1042, E-ISSN 1432-1904, Vol. 105, no 3, article id 25Article in journal (Refereed)
    Abstract [en]

    The magnitude of lateral dissolved inorganic carbon (DIC) export from terrestrial ecosystems to inland waters strongly influences the estimate of the global terrestrial carbon dioxide (CO2) sink. At present, no reliable number of this export is available, and the few studies estimating the lateral DIC export assume that all lakes on Earth function similarly. However, lakes can function along a continuum from passive carbon transporters (passive open channels) to highly active carbon transformers with efficient in-lake CO2 production and loss. We developed and applied a conceptual model to demonstrate how the assumed function of lakes in carbon cycling can affect calculations of the global lateral DIC export from terrestrial ecosystems to inland waters. Using global data on in-lake CO2 production by mineralization as well as CO2 loss by emission, primary production, and carbonate precipitation in lakes, we estimated that the global lateral DIC export can lie within the range of 0.70(-0.31)(+0.27) 1.52(-0.90)(+1.09) Pg C yr(-1) depending on the assumed function of lakes. Thus, the considered lake function has a large effect on the calculated lateral DIC export from terrestrial ecosystems to inland waters. We conclude that more robust estimates of CO2 sinks and sources will require the classification of lakes into their predominant function. This functional lake classification concept becomes particularly important for the estimation of future CO2 sinks and sources, since in-lake carbon transformation is predicted to be altered with climate change.

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  • 36. Erlandsson, Martin
    et al.
    Buffam, Ishi
    Folster, Jens
    Laudon, Hjalmar
    Temnerud, Johan
    Weyhenmeyer, Gesa A.
    Bishop, Kevin
    Thirty-five years of synchrony in the organic matter concentrations of Swedish rivers explained by variation in flow and sulphate2008In: Global Change Biology, ISSN 1354-1013, E-ISSN 1365-2486, Vol. 14, no 5, p. 1191-1198Article in journal (Refereed)
  • 37.
    Erlandsson, Martin
    et al.
    University of Reading, UK.
    Cory, Neil
    SLU.
    Fölster, Jens
    SLU Department of Aquatic Sciences and Assessment.
    Köhler, Stephan
    SLU Department of Aquatic Sciences and Assessment.
    Laudon, Hjalmar
    SLU Department of Forest Ecology and Management.
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL. Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Bishop, Kevin
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Increasing Dissolved Organic Carbon Redefines the Extent of Surface Water Acidification and Helps Resolve a Classic Controversy2011In: BioScience, ISSN 0006-3568, E-ISSN 1525-3244, Vol. 61, no 8, p. 614-618Article in journal (Refereed)
    Abstract [en]

    Concentrations of organic acids in freshwaters have increased significantly during recent decades across large parts of Europe and North America. Different theories of the causes (e.g., recovery from acidification, climate change, land use) have different implications for defining the preindustrial levels for dissolved organic carbon (DOC), which are crucial for assessing acidification and other aspects of water quality. We demonstrate this by classifying the acidification status of 66 lakes with long-term observations, representative of about 12,700 acid-sensitive lakes in nemoral and boreal Sweden. Of these lakes, 47% are classified as significantly acidified (Delta pH >= 0.4), assuming preindustrial DOC levels were equal to those observed in 1990. But if instead, the higher DOC levels observed in 2009 define preindustrial conditions, half as many lakes are acidified (24%). This emphasizes the need to establish reference levels for DOC and casts new light on the classic controversy about natural versus anthropogenic acidification.

  • 38. Erlandsson, Martin
    et al.
    Folster, Jens
    Laudon, Hjalmar
    Weyhenmeyer, Gesa A.
    Bishop, Kevin
    Natural variability in lake pH on seasonal, interannual and decadal time scales: Implications for assessment of human impact2008In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 42, no 15, p. 5594-5599Article in journal (Refereed)
  • 39.
    Farkas, Julia
    et al.
    Norwegian Univ Sci & Technol, Dept Biol, N-7491 Trondheim, Norway..
    Peter, Hannes
    Univ Innsbruck, Inst Ecol, A-6020 Innsbruck, Austria..
    Ciesielski, Tomasz M.
    Norwegian Univ Sci & Technol, Dept Biol, N-7491 Trondheim, Norway..
    Thomas, Kevin V.
    Norwegian Inst Water Res, N-0349 Oslo, Norway..
    Sommaruga, Ruben
    Univ Innsbruck, Inst Ecol, A-6020 Innsbruck, Austria..
    Salvenmoser, Willi
    Univ Innsbruck, Inst Zool, A-6020 Innsbruck, Austria..
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Tranvik, Lars J.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Jenssen, Bjorn M.
    Norwegian Univ Sci & Technol, Dept Biol, N-7491 Trondheim, Norway..
    Impact of TiO2 nanoparticles on freshwater bacteria from three Swedish lakes2015In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 535, p. 85-93Article in journal (Refereed)
    Abstract [en]

    Due to the rapidly rising production and usage of nano-enabled products, aquatic environments are increasingly exposed to engineered nanoparticles (ENPs), causing concerns about their potential negative effects. In this study we assessed the effects of uncoated titanium dioxide nanoparticles (TiO(2)NPs) on the growth and activity of bacterial communities of three Swedish lakes featuring different chemical characteristics such as dissolved organic carbon (DOC) concentration, pH and elemental composition. TiO2NP exposure concentrations were 15, 100, and 1000 mu g L-1, and experiments were performed in situ under three light regimes: darkness, photosynthetically active radiation (PAR), and ambient sunlight including UV radiation (UVR). The nanoparticles were most stable in lake water with high DOC and low chemical element concentrations. At the highest exposure concentration (1000 mu g L-1 TiO2NP) the bacterial abundance was significantly reduced in all lake waters. In the medium and high DOC lake waters, exposure concentrations of 100 mu g L-1 TiO2NP caused significant reductions in bacterial abundance. The cell-specific bacterial activity was significantly enhanced at high TiO2NP exposure concentrations, indicating the loss of nanoparticle-sensitive bacteria and a subsequent increased activity by tolerant ones. No UV-induced phototoxic effect of TiO2NP was found in this study. We conclude that in freshwater lakes with high DOC and low chemical element concentrations, uncoated TiO(2)NPs show an enhanced stability and can significantly reduce bacterial abundance at relatively low exposure concentrations.

  • 40. Frassl, Marieke A.
    et al.
    Hamilton, David P.
    Denfeld, Blaize A.
    de Eyto, Elvira
    Hampton, Stephanie E.
    Keller, Philipp S.
    Sharma, Sapna
    Lewis, Abigail S. L.
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    O'Reilly, Catherine M.
    Lofton, Mary E.
    Catalán, Núria
    Ten simple rules for collaboratively writing a multi-authored paper2018In: PloS Computational Biology, ISSN 1553-734X, E-ISSN 1553-7358, Vol. 14, no 11, article id e1006508Article in journal (Other academic)
    Abstract [en]

    Science is increasingly done in large teams, making it more likely that papers will be written by several authors from different institutes, disciplines, and cultural backgrounds. A small number of “Ten simple rules” papers have been written on collaboration and on writing but not on combining the two. Collaborative writing with multiple authors has additional challenges, including varied levels of engagement of coauthors, provision of fair credit through authorship or acknowledgements, acceptance of a diversity of work styles, and the need for clear communication. Miscommunication, a lack of leadership, and inappropriate tools or writing approaches can lead to frustration, delay of publication, or even the termination of a project.

    To provide insight into collaborative writing, we use our experience from the Global Lake Ecological Observatory Network (GLEON) to frame 10 simple rules for collaboratively writing a multi-authored paper. We consider a collaborative multi-authored paper to have three or more people from at least two different institutions. A multi-authored paper can be a result of a single discrete research project or the outcome of a larger research program that includes other papers based on common data or methods. The writing of a multi-authored paper is embedded within a broader context of planning and collaboration among team members. Our recommended rules include elements of both the planning and writing of a paper, and they can be iterative, although we have listed them in numerical order. It will help to revisit the rules frequently throughout the writing process. With the 10 rules outlined below, we aim to provide a foundation for writing multi-authored papers and conducting exciting and influential science.

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  • 41. Golub, Malgorzata
    et al.
    Koupaei-Abyazani, Nikaan
    Vesala, Timo
    Mammarella, Ivan
    Ojala, Anne
    Bohrer, Gil
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Blanken, Peter D
    Eugster, Werner
    Koebsch, Franziska
    Chen, Jiquan
    Czajkowski, Kevin
    Deshmukh, Chandrashekhar
    Guérin, Frederic
    Heiskanen, Jouni
    Humphreys, Elyn
    Jonsson, Anders
    Karlsson, Jan
    Kling, George
    Lee, Xuhui
    Liu, Heping
    Lohila, Annalea
    Lundin, Erik
    Morin, Tim
    Podgrajsek, Eva
    Provenzale, Maria
    Rutgersson, Anna
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Sachs, Torsten
    Sahlée, Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Serça, Dominique
    Shao, Changliang
    Spence, Christopher
    Strachan, Ian B.
    Xiao, Wei
    Desai, Ankur R.
    Diel, seasonal, and inter-annual variation in carbon dioxide effluxes from lakes and reservoirs2023In: Environmental Research Letters, E-ISSN 1748-9326, Vol. 18, no 3, article id 034046Article in journal (Refereed)
    Abstract [en]

    Accounting for temporal changes in carbon dioxide (CO2) effluxes from freshwaters remains a challenge for global and regional carbon budgets. Here, we synthesize 171 site-months of flux measurements of CO2 based on the eddy covariance method from 13 lakes and reservoirs in the Northern Hemisphere, and quantify dynamics at multiple temporal scales. We found pronounced sub-annual variability in CO2 flux at all sites. By accounting for diel variation, only 11% of site-months were net daily sinks of CO2. Annual CO2 emissions had an average of 25% (range 3%–58%) interannual variation. Similar to studies on streams, nighttime emissions regularly exceeded daytime emissions. Biophysical regulations of CO2 flux variability were delineated through mutual information analysis. Sample analysis of CO2 fluxes indicate the importance of continuous measurements. Better characterization of short- and long-term variability is necessary to understand and improve detection of temporal changes of CO2 fluxes in response to natural and anthropogenic drivers. Our results indicate that existing global lake carbon budgets relying primarily on daytime measurements yield underestimates of net emissions.

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  • 42.
    Grubisic, Lorena M.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Brutemark, Andreas
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Wikner, Johan
    Bamstedt, Ulf
    Bertilsson, Stefan
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Effects of stratification depth and dissolved organic matter on brackish bacterioplankton communities2012In: Marine Ecology Progress Series, ISSN 0171-8630, E-ISSN 1616-1599, Vol. 453, p. 37-48Article in journal (Refereed)
    Abstract [en]

    Bacterioplankton growth is often directly or indirectly controlled by external energy subsidies via organic matter inputs or solar radiation. We carried out a mesocosm experiment to assess how bacterioplankton communities responded to elevated levels of dissolved organic matter (DOM) and experimentally controlled stratification depth. The month-long experiment consisted of 2500 l mesocosms subjected to 4 experimental manipulations in triplicate: the stratification depth was set to either 1.5 or 3.5 m, with or without experimental addition of ambient levels of chromophoric DOM. DOM addition had a significant effect on bacterial community composition as assessed by terminal restriction fragment length polymorphism of amplified 16S rRNA genes. In contrast, there were no effects of the DOM amendment on bacterial biomass or production. Mixing depth and the coupled effective light climate in the photic zone also had a significant effect on bacterial community composition. Furthermore, shallow mixing depth was associated with enhanced primary production, whereas DOM addition had a negative effect on phyto plankton biomass and productivity. Our results suggest that bacterial community composition is coupled to primary production under the studied coastal nutrient regime, and point to a key role of DOM quality in controlling bacterioplankton communities.

  • 43. Hampton, Stephanie E.
    et al.
    Galloway, Aaron W. E.
    Powers, Stephen M.
    Ozersky, Ted
    Woo, Kara H.
    Batt, Ryan D.
    Labou, Stephanie G.
    O’Reilly, Catherine M.
    Sharma, Sapna
    Lottig, Noah R.
    Stanley, Emily H.
    North, Rebecca L.
    Stockwell, Jason D.
    Adrian, Rita
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Arvola, Lauri
    Baulch, Helen M.
    Bertani, Isabella
    Bowman, Larry L.
    Carey, Cayelan C.
    Catalan, Jordi
    Colom-Montero, William
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Domine, Leah M.
    Felip, Marisol
    Granados, Ignacio
    Gries, Corinna
    Grossart, Hans-Peter
    Haberman, Juta
    Haldna, Marina
    Hayden, Brian
    Higgins, Scott N.
    Jolley, Jeff C.
    Kahilainen, Kimmo K.
    Kaup, Enn
    Kehoe, Michael J.
    MacIntyre, Sally
    Mackay, Anson W.
    Mariash, Heather L.
    McKay, Robert M.
    Nixdorf, Brigitte
    Nõges, Peeter
    Nõges, Tiina
    Palmer, Michelle
    Pierson, Don C.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Post, David M.
    Pruett, Matthew J.
    Rautio, Milla
    Read, Jordan S.
    Roberts, Sarah L.
    Rücker, Jacqueline
    Sadro, Steven
    Silow, Eugene A.
    Smith, Derek E.
    Sterner, Robert W.
    Swann, George E. A.
    Timofeyev, Maxim A.
    Toro, Manuel
    Twiss, Michael R.
    Vogt, Richard J.
    Watson, Susan B.
    Whiteford, Erika J.
    Xenopoulos, Marguerite A.
    Ecology under lake ice2017In: Ecology Letters, ISSN 1461-023X, E-ISSN 1461-0248, Vol. 20, no 1, p. 98-111Article, review/survey (Refereed)
    Abstract [en]

    Winter conditions are rapidly changing in temperate ecosystems, particularly for those that experience periods of snow and ice cover. Relatively little is known of winter ecology in these systems, due to a historical research focus on summer ‘growing seasons’. We executed the first global quantitative synthesis on under-ice lake ecology, including 36 abiotic and biotic variables from 42 research groups and 101 lakes, examining seasonal differences and connections as well as how seasonal differences vary with geophysical factors. Plankton were more abundant under ice than expected; mean winter values were 43.2% of summer values for chlorophyll a, 15.8% of summer phytoplankton biovolume and 25.3% of summer zooplankton density. Dissolved nitrogen concentrations were typically higher during winter, and these differences were exaggerated in smaller lakes. Lake size also influenced winter-summer patterns for dissolved organic carbon (DOC), with higher winter DOC in smaller lakes. At coarse levels of taxonomic aggregation, phytoplankton and zooplankton community composition showed few systematic differences between seasons, although literature suggests that seasonal differences are frequently lake-specific, species-specific, or occur at the level of functional group. Within the subset of lakes that had longer time series, winter influenced the subsequent summer for some nutrient variables and zooplankton biomass.

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  • 44. Hastie, Adam
    et al.
    Lauerwald, Ronny
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Sobek, Sebastian
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Verpoorter, Charles
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Univ Lille, Univ Littoral Cole Opale, CNRS, LOG,UMR 8187, Wimereux, France.
    Regnier, Pierre
    CO2 evasion from boreal lakes: Revised estimate, drivers of spatial variability, and future projections2018In: Global Change Biology, ISSN 1354-1013, E-ISSN 1365-2486, Vol. 24, no 2, p. 711-728Article in journal (Refereed)
    Abstract [en]

    Lakes (including reservoirs) are an important component of the global carbon (C) cycle, as acknowledged by the 5th assessment report of the IPCC. In the context of lakes, the boreal region is disproportionately important contributing to 27% of the worldwide lake area, despite representing just 14% of global land surface area. In this study, we used a statistical approach to derive a prediction equation for the partial pressure of CO2 (pCO2) in lakes as a function of lake area, terrestrial net primary productivity (NPP) and precipitation (r2 = 0.56), and to create the first high resolution, circumboreal map (0.5) of lake pCO2. The map of pCO2 was combined with lake area from the recently published GLOWABO database and three different estimates of the gas transfer velocity k to produce a resulting map of CO2 evasion (FCO2). For the boreal region we estimate an average, lake area weighted,pCO2 of 966 (678- 1325) μatm and a total FCO2 of 189 (74-347) Tg C yr−1, and evaluate the corresponding uncertainties based on Monte Carlo simulation. Our estimate of FCO2 is approximately twofold greater than previous estimates, as a result of methodological and data source differences. We use our results along with published estimates of the other C fluxes through inland waters to derive a C budget for the boreal region, and find that FCO2 from lakes is the most significant flux of the land-ocean aquatic continuum, and of a similar magnitude as emissions from forest fires. Using the model and applying it to spatially resolved projections of terrestrial NPP and precipitation while keeping everything else constant, we predict a 107% increase in boreal lake FCO2 under emission scenario RCP8.5 by 2100. Our projections are largely driven by increases in terrestrial NPP over the same period, showing the very close connection between the terrestrial and aquatic C cycle.

  • 45.
    Hintz, William D.
    et al.
    Univ Toledo, Dept Environm Sci, 2801 W Bancroft St, Toledo, OH 43606 USA.;Univ Toledo, Lake Erie Ctr, Oregon, OH 43616 USA..
    Arnott, Shelley E.
    Queens Univ, Biol Dept, Kingston, ON K7L 3J9, Canada..
    Symons, Celia C.
    Univ Calif Irvine, Dept Ecol & Evolutionary Biol, Irvine, CA 92697 USA..
    Greco, Danielle A.
    Queens Univ, Biol Dept, Kingston, ON K7L 3J9, Canada..
    McClymont, Alexandra
    Queens Univ, Biol Dept, Kingston, ON K7L 3J9, Canada..
    Brentrup, Jennifer A.
    Dartmouth Coll, Dept Biol Sci, Hanover, NH 03755 USA..
    Canedo-Arguelles, Miguel
    Univ Barcelona, Inst Recerca Aigua, Freshwater Ecol Hydrol & Management Lab, Barcelona 08007, Spain..
    Derry, Alison M.
    Univ Quebec Montreal, Interuniv Grp Limnol, Dept Sci Biol, Montreal, PQ H2L 2C4, Canada..
    Downing, Amy L.
    Ohio Wesleyan Univ, Biol Dept, Delaware, OH 43015 USA..
    Gray, Derek K.
    Wilfrid Laurier Univ, Dept Biol, Waterloo, ON N2L 3C5, Canada..
    Melles, Stephanie J.
    Ryerson Univ, Urban Water Res Ctr, Chem & Biol Dept, Toronto, ON M5B 2K3, Canada..
    Relyea, Rick A.
    Rensselaer Polytech Inst, Darrin Fresh Water Inst, Dept Biol Sci, Troy, NY 12180 USA..
    Rusak, James A.
    Queens Univ, Biol Dept, Kingston, ON K7L 3J9, Canada.;Ontario Minist Environm Conservat & Pk, Dorset Environm Sci Ctr, Dorset, ON P0A 1E0, Canada..
    Searle, Catherine L.
    Purdue Univ, Dept Biol Sci, W Lafayette, IN 47906 USA..
    Astorg, Louis
    Univ Quebec Montreal, Interuniv Grp Limnol, Dept Sci Biol, Montreal, PQ H2L 2C4, Canada..
    Baker, Henry K.
    Univ Calif San Diego, Sect Ecol Behav & Evolut, La Jolla, CA 92093 USA..
    Beisner, Beatrix E.
    Univ Quebec Montreal, Interuniv Grp Limnol, Dept Sci Biol, Montreal, PQ H2L 2C4, Canada..
    Cottingham, Kathryn L.
    Dartmouth Coll, Dept Biol Sci, Hanover, NH 03755 USA..
    Ersoy, Zeynep
    Univ Evora, Mediterranean Inst Agr Environm & Dev, Rui Nabeiro Biodivers Chair, P-7004516 Evora, Portugal..
    Espinosa, Carmen
    Univ Vic, Ctr Study Mediterranean Rivers, Cent Univ Catalonia, Manlleu 08500, Spain..
    Franceschini, Jaclyn
    Wilfrid Laurier Univ, Dept Biol, Waterloo, ON N2L 3C5, Canada..
    Giorgio, Angelina T.
    Rensselaer Polytech Inst, Darrin Fresh Water Inst, Dept Biol Sci, Troy, NY 12180 USA..
    Gobeler, Norman
    Univ Helsinki, Tvarminne Zool Stn, Hango 10900, Finland..
    Hassal, Emily
    Ontario Tech Univ, Fac Sci, Oshawa, ON L1G 0C5, Canada..
    Hebert, Marie-Pier
    Univ Quebec Montreal, Interuniv Grp Limnol, Dept Sci Biol, Montreal, PQ H2L 2C4, Canada.;McGill Univ, Dept Biol, Montreal, PQ H3A 0G4, Canada..
    Huynh, Mercedes
    Wilfrid Laurier Univ, Dept Biol, Waterloo, ON N2L 3C5, Canada..
    Hylander, Samuel
    Linnaeus Univ, Ctr Ecol & Evolut Microbial Model Syst, Dept Biol & Environm Sci, SE-39231 Kalmar, Sweden..
    Jonasen, Kacie L.
    Purdue Univ, Dept Biol Sci, W Lafayette, IN 47906 USA..
    Kirkwood, Andrea E.
    Ontario Tech Univ, Fac Sci, Oshawa, ON L1G 0C5, Canada..
    Langenheder, Silke
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Langvall, Ola
    Swedish Univ Agr Sci, Unit Field Based Forest Res, SE-79230 Mora, Sweden..
    Laudon, Hjalmar
    Swedish Univ Agr Sci, Dept Forest Ecol & Management, SE-90183 Umeå, Sweden..
    Lind, Lovisa
    Karlstads Univ, Dept Environm & Life Sci, S-65188 Karlstad, Sweden..
    Lundgren, Maria
    Linnaeus Univ, Dept Biol & Environm Sci, SE-39231 Kalmar, Sweden..
    Proia, Lorenzo
    Univ Vic, Technol Ctr Biodivers Ecol & Environm & Food Tech, TECNIO Network, Cent Univ Catalonia, Vic 08500, Spain..
    Schuler, Matthew S.
    Montclair State Univ, Dept Biol, Montclair, NJ 07043 USA..
    Shurin, Jonathan B.
    Univ Calif San Diego, Sect Ecol Behav & Evolut, La Jolla, CA 92093 USA..
    Steiner, Christopher F.
    Wayne State Univ, Dept Biol Sci, Detroit, MI 48202 USA..
    Striebel, Maren
    Carl von Ossietzky Univ Oldenburg, Inst Chem & Biol Marine Environm, Plankton Ecol, D-26382 Wilhelmshaven, Germany..
    Thibodeau, Simon
    Univ Quebec Montreal, Interuniv Grp Limnol, Dept Sci Biol, Montreal, PQ H2L 2C4, Canada..
    Urrutia-Cordero, Pablo
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics.
    Vendrell-Puigmitja, Lidia
    Univ Vic, Technol Ctr Biodivers Ecol & Environm & Food Tech, TECNIO Network, Cent Univ Catalonia, Vic 08500, Spain..
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL. Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala Univ, Dept Ecol & Genet, Limnol, S-75236 Uppsala, Sweden..
    Current water quality guidelines across North America and Europe do not protect lakes from salinization2022In: Proceedings of the National Academy of Sciences of the United States of America, ISSN 0027-8424, E-ISSN 1091-6490, Vol. 119, no 9, article id e2115033119Article in journal (Refereed)
    Abstract [en]

    Human-induced salinization caused by the use of road deicing salts, agricultural practices, mining operations, and climate change is a major threat to the biodiversity and functioning of freshwater ecosystems. Yet, it is unclear if freshwater ecosystems are protected from salinization by current water quality guidelines. Leveraging an experimental network of land-based and in-lake mesocosms across North America and Europe, we tested how salinization-indicated as elevated chloride (C-) concentration-will affect lake food webs and if two of the lowest Cl- thresholds found globally are sufficient to protect these food webs. Our results indicated that salinization will cause substantial zooplankton mortality at the lowest Cl- thresholds established in Canada (120 mg Cl-/L) and the United States (230 mg Cl-/L) and throughout Europe where Cl- thresholds are generally higher. For instance, at 73% of our study sites, Cl- concentrations that caused a >= 50% reduction in cladoceran abundance were at or below Cl thresholds in Canada, in the United States, and throughout Europe. Similar trends occurred for copepod and rotifer zooplankton. The loss of zooplankton triggered a cascading effect causing an increase in phytoplankton biomass at 47% of study sites. Such changes in lake food webs could alter nutrient cycling and water clarity and trigger declines in fish production. Current Cl- thresholds across North America and Europe clearly do not adequately protect lake food webs. Water quality guidelines should be developed where they do not exist, and there is an urgent need to reassess existing guidelines to protect lake ecosystems from human-induced salinization.

  • 46. Hock, R
    et al.
    Rasul, G.
    Adler, C.
    Cáceres, B.
    Gruber, S.
    Hirabayashi, Y.
    Jackson, M.
    Kääb, A.
    Kang, S.
    Kutuzov, S.
    Milner, A.
    Molau, U.
    Morin, S.
    Orlove, B.
    Steltzer, H.
    Allen, S.
    Arenson, L.
    Baneerjee, S.
    Barr, I.
    Bórquez, R.
    Brown, L.
    Cao, B.
    Carey, M.
    Cogley, G.
    Fischlin, A.
    de Sherbinin, A.
    Eckert, N.
    Geertsema, M.
    Hagenstad, M.
    Honsberg, M.
    Hood, E.
    Huss, M.
    Jimenez Zamora, E.
    Kotlarski, S.
    Lefeuvre, P-M
    Ignacio López Moreno, J.
    Lundquist, J.
    McDowell, G.
    Mills, S.
    Mou, C.
    Nepal, S.
    Noetzli, J.
    Palazzi, E.
    Pepin, N.
    Rixen, C.
    Shahgedanova, M.
    McKenzie Skiles, S.
    Vincent, C.
    Viviroli, D.
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL. Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Yangjee Sherpa, P.
    Weyer, N.
    Wouters, B.
    Yasunari, T.
    You, Q.
    Zhang, Y
    High Mountain Areas2019In: IPCC Special Report on the Ocean and Cryosphere in a Changing Climate / [ed] H.-O. Pörtner, D.C. Roberts, V. Masson-Delmotte, P. Zhai, M. Tignor, E. Poloczanska, K. Mintenbeck, A. Alegría, M. Nicolai, A. Okem, J. Petzold, B. Rama, N.M. Weyer (eds.), IPCC - Intergovernmental Panel on Climate Change , 2019, p. 131-202Chapter in book (Other academic)
    Abstract [en]

    The cryosphere (including, snow, glaciers, permafrost, lake and river ice) is an integral element of high- mountain regions, which are home to roughly 10% of the global population. Widespread cryosphere changes affect physical, biological and human systems in the mountains and surrounding lowlands, with impacts evident even in the ocean. Building on the IPCC’s Fifth Assessment Report (AR5), this chapter assesses new evidence on observed recent and projected changes in the mountain cryosphere as well as associated impacts, risks and adaptation measures related to natural and human systems. Impacts in response to climate changes independently of changes in the cryosphere are not assessed in this chapter. Polar mountains are included in Chapter 3, except those in Alaska and adjacent Yukon, Iceland, and Scandinavia, which are included in this chapter.

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    fulltext
  • 47. Humborg, Christoph
    et al.
    Andersen, Hans Estrup
    Blenckner, Thorsten
    Gadegast, Mathias
    Giesler, Reiner
    Hartmann, Jens
    Hugelius, Gustaf
    Hürdler, Jens
    Kortelainen, Pirkko
    Blicher-Mathiesen, Gitte
    Venohr, Markus
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Environmental Impacts—Freshwater Biogeochemistry2015In: Second Assessment of Climate Change for the Baltic Sea Basin, Cham: Springer, 2015, p. 307-336Chapter in book (Other academic)
  • 48. Hébert, Marie-Pier
    et al.
    Symons, Celia C.
    Cañedo-Argüelles, Miguel
    Arnott, Shelley E.
    Derry, Alison M.
    Fugère, Vincent
    Hintz, William D.
    Melles, Stephanie J.
    Astorg, Louis
    Baker, Henry K.
    Brentrup, Jennifer A.
    Downing, Amy L.
    Ersoy, Zeynep
    Espinosa, Carmen
    Franceschini, Jaclyn M.
    Giorgio, Angelina T.
    Göbeler, Norman
    Gray, Derek K.
    Greco, Danielle
    Hassal, Emily
    Huynh, Mercedes
    Hylander, Samuel
    Jonasen, Kacie L.
    Kirkwood, Andrea
    Langenheder, Silke
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Langvall, Ola
    Laudon, Hjalmar
    Lind, Lovisa
    Lundgren, Maria
    McClymont, Alexandra
    Proia, Lorenzo
    Relyea, Rick A.
    Rusak, James A.
    Schuler, Matthew S.
    Searle, Catherine L.
    Shurin, Jonathan B.
    Steiner, Christopher F.
    Striebel, Maren
    Thibodeau, Simon
    Urrutia Cordero, Pablo
    Vendrell-Puigmitja, Lidia
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Beisner, Beatrix E.
    Lake salinization drives consistent losses of zooplankton abundance and diversity across coordinated mesocosm experiments2022In: Limnology and Oceanography Letters, E-ISSN 2378-2242Article in journal (Refereed)
    Abstract [en]

    Human-induced salinization increasingly threatens inland waters; yet we know little about the multifaceted response of lake communities to salt contamination. By conducting a coordinated mesocosm experiment of lake salinization across 16 sites in North America and Europe, we quantified the response of zooplankton abundance and (taxonomic and functional) community structure to a broad gradient of environmentally relevant chloride concentrations, ranging from 4 to ca. 1400 mg Cl− L−1. We found that crustaceans were distinctly more sensitive to elevated chloride than rotifers; yet, rotifers did not show compensatory abundance increases in response to crustacean declines. For crustaceans, our among-site comparisons indicate: (1) highly consistent decreases in abundance and taxon richness with salinity; (2) widespread chloride sensitivity across major taxonomic groups (Cladocera, Cyclopoida, and Calanoida); and (3) weaker loss of functional than taxonomic diversity. Overall, our study demonstrates that aggregate properties of zooplankton communities can be adversely affected at chloride concentrations relevant to anthropogenic salinization in lakes.

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  • 49.
    Jane, Stephen F.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Rensselaer Polytech Inst, Dept Biol Sci, Troy, NY 12180 USA..
    Hansen, Gretchen J. A.
    Univ Minnesota, Dept Wildlife & Fisheries Biol, St Paul, MN 55108 USA..
    Kraemer, Benjamin M.
    IGB Leibniz Inst Freshwater Ecol & Inland Fisheri, Dept Ecosyst Res, Berlin, Germany..
    Leavitt, Peter R.
    Univ Regina, Inst Environm Change & Soc, Regina, SK, Canada.;Queens Univ Belfast, Inst Global Food Secur, Belfast, Antrim, North Ireland..
    Mincer, Joshua L.
    Rensselaer Polytech Inst, Dept Biol Sci, Troy, NY 12180 USA..
    North, Rebecca L.
    Univ Missouri, Sch Nat Resources, Columbia, MO USA..
    Pilla, Rachel M.
    Miami Univ, Dept Biol, Oxford, OH 45056 USA..
    Stetler, Jonathan T.
    Rensselaer Polytech Inst, Dept Biol Sci, Troy, NY 12180 USA..
    Williamson, Craig E.
    Miami Univ, Dept Biol, Oxford, OH 45056 USA..
    Woolway, R. Iestyn
    Dundalk Inst Technol, Ctr Freshwater & Environm Studies, Dundalk, Ireland.;ECSAT, European Space Agcy Climate Off, Harwell Campus, Didcot, Oxon, England..
    Arvola, Lauri
    Univ Helsinki, Lammi Biol Stn, Lammi, Finland..
    Chandra, Sudeep
    Univ Nevada, Dept Biol, Global Water Ctr, Reno, NV 89557 USA..
    DeGasperi, Curtis L.
    King Cty Water & Land Resources Div, Seattle, WA USA..
    Diemer, Laura
    FB Environm Associates, Portsmouth, NH USA..
    Dunalska, Julita
    Univ Warmia & Mazury, Dept Water Protect Engn & Environm Microbiol, Olsztyn, Poland.;Univ Gdansk, Inst Geog, Gdansk, Poland..
    Erina, Oxana
    Lomonosov Moscow State Univ, Dept Hydrol, Moscow, Russia..
    Flaim, Giovanna
    Fdn Edmund Mach, Res & Innovat Ctr, Dept Sustainable Agroecosyst & Bioresources, San Michele All Adige, Italy..
    Grossart, Hans-Peter
    Leibniz Inst Freshwater Ecol & Inland Fisheries, Dept Expt Limnol, Stechlin, Germany.;Potsdam Univ, Inst Biochem & Biol, Potsdam, Germany..
    Hambright, K. David
    Univ Oklahoma, Plankton Ecol & Limnol Lab, Geog Ecol Grp, Norman, OK 73019 USA.;Univ Oklahoma, Dept Biol, Ecol & Evolutionary Biol, Norman, OK 73019 USA..
    Hein, Catherine
    Wisconsin Dept Nat Resources, Madison, WI USA..
    Hejzlar, Josef
    Biol Ctr CAS, Inst Hydrobiol, Ceske Budejovice, Czech Republic..
    Janus, Lorraine L.
    New York City Dept Environm Protect, Bur Water Supply, Valhalla, NY USA..
    Jenny, Jean-Philippe
    Univ Savoie Mont Blanc, Inst Natl Rech Agron INRA, CARRTEL Limnol Ctr, Chambery, France..
    Jones, John R.
    Univ Missouri, Sch Nat Resources, Columbia, MO USA..
    Knoll, Lesley B.
    Univ Minnesota, Itasca Biol Stn & Labs, Lake Itasca, MN USA..
    Leoni, Barbara
    Univ Milano Bicocca, Dept Earth & Environm Sci, Milan, Italy..
    Mackay, Eleanor
    UK Ctr Ecol & Hydrol, Lake Ecosyst Grp, Lancaster, England..
    Matsuzaki, Shin-Ichiro S.
    Natl Inst Environm Studies, Biodivers Div, Ibaraki, Japan..
    McBride, Chris
    Environm Res Inst, Hamilton, New Zealand..
    Muller-Navarra, Dorthe C.
    Univ Hamburg, Dept Biol, Hamburg, Germany..
    Paterson, Andrew M.
    Ontario Minist Environm Conservat & Parks, Dorset Environm Sci Ctr, Dorset, ON, Canada..
    Pierson, Don
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Rogora, Michela
    CNR Water Res Inst IRSA, Verbania, Italy..
    Rusak, James A.
    Ontario Minist Environm Conservat & Parks, Dorset Environm Sci Ctr, Dorset, ON, Canada..
    Sadro, Steven
    Univ Calif Davis, Dept Environm Sci & Policy, Davis, CA 95616 USA..
    Saulnier-Talbot, Emilie
    Univ Laval, Dept Biol, Quebec City, PQ, Canada.;Univ Laval, Dept Geog, Quebec City, PQ, Canada..
    Schmid, Martin
    Swiss Fed Inst Aquat Sci & Technol, Eawag, Surface Waters Res & Management, Kastanienbaum, Switzerland..
    Sommaruga, Ruben
    Univ Innsbruck, Dept Ecol, Innsbruck, Austria..
    Thiery, Wim
    Vrije Univ Brussel, Dept Hydrol & Hydraul Engn, Brussels, Belgium.;Swiss Fed Inst Technol, Inst Atmospher & Climate Sci Zurich, Zurich, Switzerland..
    Verburg, Piet
    Natl Inst Water & Atmospher Res Ltd NIWA, Hamilton, New Zealand..
    Weathers, Kathleen C.
    Cary Inst Ecosyst Studies, Millbrook, NY USA..
    Weyhenmeyer, Gesa A.
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
    Yokota, Kiyoko
    SUNY Coll Oneonta, Dept Biol, SUNY Oneonta, Oneonta, NY 13820 USA..
    Rose, Kevin C.
    Rensselaer Polytech Inst, Dept Biol Sci, Troy, NY 12180 USA..
    Widespread deoxygenation of temperate lakes2021In: Nature, ISSN 0028-0836, E-ISSN 1476-4687, Vol. 594, no 7861, p. 66-70Article in journal (Refereed)
    Abstract [en]

    The concentration of dissolved oxygen in aquatic systems helps to regulate biodiversity(1,2), nutrient biogeochemistry(3), greenhouse gas emissions(4), and the quality of drinking water(5). The long-term declines in dissolved oxygen concentrations in coastal and ocean waters have been linked to climate warming and human activity(6,7), but little is known about the changes in dissolved oxygen concentrations in lakes. Although the solubility of dissolved oxygen decreases with increasing water temperatures, long-term lake trajectories are difficult to predict. Oxygen losses in warming lakes may be amplified by enhanced decomposition and stronger thermal stratification(8,9) or oxygen may increase as a result of enhanced primary production(10). Here we analyse a combined total of 45,148 dissolved oxygen and temperature profiles and calculate trends for 393 temperate lakes that span 1941 to 2017. We find that a decline in dissolved oxygen is widespread in surface and deep-water habitats. The decline in surface waters is primarily associated with reduced solubility under warmer water temperatures, although dissolved oxygen in surface waters increased in a subset of highly productive warming lakes, probably owing to increasing production of phytoplankton. By contrast, the decline in deep waters is associated with stronger thermal stratification and loss of water clarity, but not with changes in gas solubility. Our results suggest that climate change and declining water clarity have altered the physical and chemical environment of lakes. Declines in dissolved oxygen in freshwater are 2.75 to 9.3 times greater than observed in the world's oceans(6,7) and could threaten essential lake ecosystem services(2,3,5,11).

  • 50. Jankowski, Thomas
    et al.
    Weyhenmeyer, Gesa A.
    The role of spatial scale and area in determining richness-altitude gradients in Swedish lake phytoplankton communities2006In: Oikos, ISSN 0030-1299, E-ISSN 1600-0706, Vol. 115, no 3, p. 433-442Article in journal (Refereed)
1234 1 - 50 of 196
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