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Weyhenmeyer, Gesa A.ORCID iD iconorcid.org/0000-0002-4013-2281
Alternative names
Publications (10 of 196) Show all publications
Lewis, A. S. L., Lau, M. P., Jane, S. F., Rose, K. C., Be'eri-Shlevin, Y., Burnet, S. H., . . . Carey, C. C. (2024). Anoxia begets anoxia: A positive feedback to the deoxygenation of temperate lakes. Paper presented at 2024/01/02/12:20:55. Global Change Biology, 30(1), Article ID e17046.
Open this publication in new window or tab >>Anoxia begets anoxia: A positive feedback to the deoxygenation of temperate lakes
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2024 (English)In: Global Change Biology, ISSN 1354-1013, E-ISSN 1365-2486, Vol. 30, no 1, article id e17046Article in journal (Refereed) Published
Abstract [en]

Declining oxygen concentrations in the deep waters of lakes worldwide pose a pressing environmental and societal challenge. Existing theory suggests that low deep-water dissolved oxygen (DO) concentrations could trigger a positive feedback through which anoxia (i.e., very low DO) during a given summer begets increasingly severe occurrences of anoxia in following summers. Specifically, anoxic conditions can promote nutrient release from sediments, thereby stimulating phytoplankton growth, and subsequent phytoplankton decomposition can fuel heterotrophic respiration, resulting in increased spatial extent and duration of anoxia. However, while the individual relationships in this feedback are well established, to our knowledge, there has not been a systematic analysis within or across lakes that simultaneously demonstrates all of the mechanisms necessary to produce a positive feedback that reinforces anoxia. Here, we compiled data from 656 widespread temperate lakes and reservoirs to analyze the proposed anoxia begets anoxia feedback. Lakes in the dataset span a broad range of surface area (1–126,909 ha), maximum depth (6–370 m), and morphometry, with a median time-series duration of 30 years at each lake. Using linear mixed models, we found support for each of the positive feedback relationships between anoxia, phosphorus concentrations, chlorophyll a concentrations, and oxygen demand across the 656-lake dataset. Likewise, we found further support for these relationships by analyzing time-series data from individual lakes. Our results indicate that the strength of these feedback relationships may vary with lake-specific characteristics: For example, we found that surface phosphorus concentrations were more positively associated with chlorophyll a in high-phosphorus lakes, and oxygen demand had a stronger influence on the extent of anoxia in deep lakes. Taken together, these results support the existence of a positive feedback that could magnify the effects of climate change and other anthropogenic pressures driving the development of anoxia in lakes around the world.

Place, publisher, year, edition, pages
John Wiley & Sons, 2024
Keywords
air temperature, anoxia, chlorophyll a, dissolved oxygen, feedback, hypolimnion, lake, oxygen demand, phosphorus, residence time
National Category
Ecology Geosciences, Multidisciplinary
Identifiers
urn:nbn:se:uu:diva-519022 (URN)10.1111/gcb.17046 (DOI)
Conference
2024/01/02/12:20:55
Funder
Swedish Research Council, 2020-03222Swedish Research Council Formas, 2020-01091
Available from: 2024-01-02 Created: 2024-01-02 Last updated: 2024-01-03Bibliographically approved
Reinl, K. L., Harris, T. D., North, R. L., Almela, P., Berger, S. A., Bizic, M., . . . Yokota, K. (2023). Blooms also like it cold. Limnology and Oceanography Letters, 8(4), 546-564
Open this publication in new window or tab >>Blooms also like it cold
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2023 (English)In: Limnology and Oceanography Letters, E-ISSN 2378-2242, Vol. 8, no 4, p. 546-564Article, review/survey (Refereed) Published
Abstract [en]

Cyanobacterial blooms have substantial direct and indirect negative impacts on freshwater ecosystems including releasing toxins, blocking light needed by other organisms, and depleting oxygen. There is growing concern over the potential for climate change to promote cyanobacterial blooms, as the positive effects of increasing lake surface temperature on cyanobacterial growth are well documented in the literature; however, there is increasing evidence that cyanobacterial blooms are also being initiated and persisting in relatively cold-water temperatures (< 15 °C), including ice-covered conditions. In this work, we provide evidence of freshwater cold-water cyanobacterial blooms, review abiotic drivers and physiological adaptations leading to these blooms, offer a typology of these lesser-studied cold-water cyanobacterial blooms, and discuss their occurrence under changing climate conditions.

Place, publisher, year, edition, pages
John Wiley & Sons, 2023
National Category
Ecology Oceanography, Hydrology and Water Resources
Identifiers
urn:nbn:se:uu:diva-513132 (URN)10.1002/lol2.10316 (DOI)000934614000001 ()
Funder
Swedish Research Council, 2020-03222Swedish Research Council Formas, 2020-01091Swedish Research Council Formas, 2020-01825German Research Foundation (DFG), 1987/2-1European Science Foundation (ESF), CZ.02.1.01/0.0/0.0/16_025/0007417European Regional Development Fund (ERDF), CZ.02.1.01/0.0/0.0/16_025/0007417
Available from: 2023-10-03 Created: 2023-10-03 Last updated: 2023-10-03Bibliographically approved
Münzner, K., Langenheder, S., Weyhenmeyer, G. A., Csitári, B. & Lindström, E. S. (2023). Carbon dioxide reduction by photosynthesis undetectable even during phytoplankton blooms in two lakes. Scientific Reports, 13(1), Article ID 13503.
Open this publication in new window or tab >>Carbon dioxide reduction by photosynthesis undetectable even during phytoplankton blooms in two lakes
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2023 (English)In: Scientific Reports, E-ISSN 2045-2322, Vol. 13, no 1, article id 13503Article in journal (Refereed) Published
Abstract [en]

Lakes located in the boreal region are generally supersaturated with carbon dioxide (CO2), which emerges from inflowing inorganic carbon from the surrounding watershed and from mineralization of allochthonous organic carbon. While these CO2 sources gained a lot of attention, processes that reduce the amount of CO2 have been less studied. We therefore examined the CO2 reduction capacity during times of phytoplankton blooms. We investigated partial pressure of CO2 (pCO(2)) in two lakes at times of blooms dominated by the cyanobacterium Gloeotrichia echinulata (Erken, Sweden) or by the nuisance alga Gonyostomum semen (Erssjon, Sweden) during two years. Our results showed that pCO(2) and phytoplankton densities remained unrelated in the two lakes even during blooms. We suggest that physical factors, such as wind-induced water column mixing and import of inorganic carbon via inflowing waters suppressed the phytoplankton signal on pCO(2). These results advance our understanding of carbon cycling in lakes and highlight the importance of detailed lake studies for more precise estimates of local, regional and global carbon budgets.

Place, publisher, year, edition, pages
Nature Publishing Group, 2023
National Category
Ecology
Identifiers
urn:nbn:se:uu:diva-510983 (URN)10.1038/s41598-023-40596-6 (DOI)001052369000024 ()37598248 (PubMedID)
Funder
Swedish Research Council, 2020-01091Swedish Research Council FormasEU, Horizon 2020
Available from: 2023-09-06 Created: 2023-09-06 Last updated: 2023-09-06Bibliographically approved
Golub, M., Koupaei-Abyazani, N., Vesala, T., Mammarella, I., Ojala, A., Bohrer, G., . . . Desai, A. R. (2023). Diel, seasonal, and inter-annual variation in carbon dioxide effluxes from lakes and reservoirs. Environmental Research Letters, 18(3), Article ID 034046.
Open this publication in new window or tab >>Diel, seasonal, and inter-annual variation in carbon dioxide effluxes from lakes and reservoirs
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2023 (English)In: Environmental Research Letters, E-ISSN 1748-9326, Vol. 18, no 3, article id 034046Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2023
National Category
Earth and Related Environmental Sciences
Identifiers
urn:nbn:se:uu:diva-500036 (URN)10.1088/1748-9326/acb834 (DOI)000953683700001 ()
Funder
Academy of Finland, 337549Academy of Finland, 337552EU, Horizon Europe, 101056921Swedish Research Council, 2016-04153Swedish Research Council, 2020-03222
Note

Correction in: Environmental Research Letters, vol. 18, issue 10, article number 109501

DOI: 10.1088/1748-9326/acfb97

Available from: 2023-04-11 Created: 2023-04-11 Last updated: 2024-01-17Bibliographically approved
Nava, V., Chandra, S., Aherne, J., Alfonso, M. B., Antao-Geraldes, A. M., Attermeyer, K., . . . Leoni, B. (2023). Plastic debris in lakes and reservoirs. Nature, 619(7969), 317-322
Open this publication in new window or tab >>Plastic debris in lakes and reservoirs
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2023 (English)In: Nature, ISSN 0028-0836, E-ISSN 1476-4687, Vol. 619, no 7969, p. 317-322Article in journal (Refereed) Published
Abstract [en]

Plastic debris is thought to be widespread in freshwater ecosystems globally(1). However, a lack of comprehensive and comparable data makes rigorous assessment of its distribution challenging(2,3). Here we present a standardized cross-national survey that assesses the abundance and type of plastic debris (>250 mu m) in freshwater ecosystems. We sample surface waters of 38 lakes and reservoirs, distributed across gradients of geographical position and limnological attributes, with the aim to identify factors associated with an increased observation of plastics. We find plastic debris in all studied lakes and reservoirs, suggesting that these ecosystems play a key role in the plastic-pollution cycle. Our results indicate that two types of lakes are particularly vulnerable to plastic contamination: lakes and reservoirs in densely populated and urbanized areas and large lakes and reservoirs with elevated deposition areas, long water-retention times and high levels of anthropogenic influence. Plastic concentrations vary widely among lakes; in the most polluted, concentrations reach or even exceed those reported in the subtropical oceanic gyres, marine areas collecting large amounts of debris(4). Our findings highlight the importance of including lakes and reservoirs when addressing plastic pollution, in the context of pollution management and for the continued provision of lake ecosystem services.

Place, publisher, year, edition, pages
Springer Nature, 2023
National Category
Ecology Environmental Sciences Oceanography, Hydrology and Water Resources
Identifiers
urn:nbn:se:uu:diva-510354 (URN)10.1038/s41586-023-06168-4 (DOI)001032441500020 ()37438590 (PubMedID)
Funder
EU, Horizon 2020, 965367Australian Research Council, DP190101848Swedish Research Council, 2020-03222Swedish Research Council Formas, 2020-01091
Available from: 2023-08-28 Created: 2023-08-28 Last updated: 2023-08-28Bibliographically approved
Arnott, S. E., Fugère, V., Symons, C. C., Melles, S. J., Beisner, B. E., Cañedo-Argüelles, M., . . . Derry, A. M. (2023). Widespread variation in salt tolerance within freshwater zooplankton species reduces the predictability of community-level salt tolerance. Limnology and Oceanography Letters, 8(1), 8-18
Open this publication in new window or tab >>Widespread variation in salt tolerance within freshwater zooplankton species reduces the predictability of community-level salt tolerance
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2023 (English)In: Limnology and Oceanography Letters, E-ISSN 2378-2242, Vol. 8, no 1, p. 8-18Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
John Wiley & Sons, 2023
National Category
Ecology
Identifiers
urn:nbn:se:uu:diva-492873 (URN)10.1002/lol2.10277 (DOI)000843682900001 ()
Funder
Swedish Research Council, 2017-00635Swedish Research Council, 2017-06421EU, European Research CouncilEU, Horizon 2020, 801370
Available from: 2023-01-10 Created: 2023-01-10 Last updated: 2023-09-11Bibliographically approved
Hintz, W. D., Arnott, S. E., Symons, C. C., Greco, D. A., McClymont, A., Brentrup, J. A., . . . Weyhenmeyer, G. A. (2022). Current water quality guidelines across North America and Europe do not protect lakes from salinization. Proceedings of the National Academy of Sciences of the United States of America, 119(9), Article ID e2115033119.
Open this publication in new window or tab >>Current water quality guidelines across North America and Europe do not protect lakes from salinization
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2022 (English)In: 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) Published
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.

Place, publisher, year, edition, pages
Proceedings of the National Academy of Sciences (PNAS), 2022
Keywords
biodiversity, climate change, environmental policy, land use, water quality
National Category
Environmental Sciences Ecology
Identifiers
urn:nbn:se:uu:diva-471680 (URN)10.1073/pnas.2115033119 (DOI)000766706200014 ()35193976 (PubMedID)
Funder
EU, Horizon 2020, 801370EU, Horizon 2020, 2017-06421Swedish Research CouncilSwedish Research Council, 2017-00635
Available from: 2022-04-04 Created: 2022-04-04 Last updated: 2023-03-23Bibliographically approved
Weyhenmeyer, G. A. (2022). Data on lake ice quality from the international IceBlitz campaign in 2020/2021.
Open this publication in new window or tab >>Data on lake ice quality from the international IceBlitz campaign in 2020/2021
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2022 (English)Data set, Primary data
National Category
Earth and Related Environmental Sciences
Research subject
Earth Science with specialization in Environmental Analysis
Identifiers
urn:nbn:se:uu:diva-468290 (URN)
Funder
Swedish Research Council, 2020-03222Swedish Research Council Formas, 2020-01091
Available from: 2022-02-23 Created: 2022-02-23 Last updated: 2022-02-23Bibliographically approved
Jansen, J., Woolway, R. I., Kraemer, B. M., Albergel, C., Bastviken, D., Weyhenmeyer, G. A., . . . Jennings, E. (2022). Global increase in methane production under future warming of lake bottom waters. Global Change Biology, 28(18), 5427-5440
Open this publication in new window or tab >>Global increase in methane production under future warming of lake bottom waters
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2022 (English)In: Global Change Biology, ISSN 1354-1013, E-ISSN 1365-2486, Vol. 28, no 18, p. 5427-5440Article in journal (Refereed) Published
Abstract [en]

Lakes are significant emitters of methane to the atmosphere, and thus are important components of the global methane budget. Methane is typically produced in lake sediments, with the rate of methane production being strongly temperature dependent. Local and regional studies highlight the risk of increasing methane production under future climate change, but a global estimate is not currently available. Here, we project changes in global lake bottom temperatures and sediment methane production rates from 1901 to 2099. By the end of the 21st century, lake bottom temperatures are projected to increase globally, by an average of 0.86-2.60 degrees C under Representative Concentration Pathways (RCPs) 2.6-8.5, with greater warming projected at lower latitudes. This future warming of bottom waters will likely result in an increase in methane production rates of 13%-40% by the end of the century, with many low-latitude lakes experiencing an increase of up to 17 times the historical (1970-1999) global average under RCP 8.5. The projected increase in methane production will likely lead to higher emissions from lakes, although the exact magnitude of the emission increase requires more detailed regional studies.

Place, publisher, year, edition, pages
John Wiley & Sons, 2022
Keywords
aquatic, climate change, greenhouse gases, limnology, methane, temperature, tropics
National Category
Environmental Sciences Climate Research
Identifiers
urn:nbn:se:uu:diva-485430 (URN)10.1111/gcb.16298 (DOI)000815351300001 ()35694903 (PubMedID)
Funder
EU, FP7, Seventh Framework Programme, 336642EU, Horizon 2020, 725546Knut and Alice Wallenberg Foundation, KAW 2018-0191Swedish Research Council, 2020-06460Swedish Research Council, 2018-04524Swedish Research Council, 2016-04829Swedish Research Council, 2020-03222Swedish Research Council, 2017-04405Swedish Research Council Formas, 2018-01794Swedish Research Council Formas, 2020-01091German Research Foundation (DFG), AD 91/22-1
Available from: 2022-09-27 Created: 2022-09-27 Last updated: 2022-09-27Bibliographically approved
Hébert, M.-P., Symons, C. C., Cañedo-Argüelles, M., Arnott, S. E., Derry, A. M., Fugère, V., . . . Beisner, B. E. (2022). Lake salinization drives consistent losses of zooplankton abundance and diversity across coordinated mesocosm experiments. Limnology and Oceanography Letters
Open this publication in new window or tab >>Lake salinization drives consistent losses of zooplankton abundance and diversity across coordinated mesocosm experiments
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2022 (English)In: Limnology and Oceanography Letters, E-ISSN 2378-2242Article in journal (Refereed) Epub ahead of print
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.

Place, publisher, year, edition, pages
John Wiley & Sons, 2022
National Category
Ecology
Identifiers
urn:nbn:se:uu:diva-492874 (URN)10.1002/lol2.10239 (DOI)000750378500001 ()
Funder
EU, Horizon 2020, 801370EU, European Research CouncilSwedish Research Council
Available from: 2023-01-10 Created: 2023-01-10 Last updated: 2023-01-19
Projects
Regional differences in the quality of DOC in boreal lakes: drivers and consequences for the global carbon cycle [2009-02711_VR]; Uppsala UniversityIntegrating differences in the functioning of lakes in the global carbon cycle for improved estimates of the terrestrial carbon sink [2016-04153_VR]; Uppsala UniversityRapid ice quality changes in the Northern Hemisphere and consequences for the achievement of several global sustainable development goals [2020-03222_VR]; Uppsala UniversityChallenges and opportunities of rapidly changing ice properties on ecosystem services from freshwaters [2020-01091_Formas]; Uppsala University
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-4013-2281

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