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Lindström, E. S., Eiler, A., Langenheder, S., Bertilsson, S., Drakare, S., Ragnarsson, H. & Tranvik, L. J. (2007). Does ecosystem size determine aquatic bacterial richness? Comment. Ecology, 88(1), 252-253
Öppna denna publikation i ny flik eller fönster >>Does ecosystem size determine aquatic bacterial richness? Comment
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2007 (Engelska)Ingår i: Ecology, ISSN 0012-9658, E-ISSN 1939-9170, Vol. 88, nr 1, s. 252-253Artikel i tidskrift (Refereegranskat) Published
Nationell ämneskategori
Biologiska vetenskaper Ekologi
Identifikatorer
urn:nbn:se:uu:diva-10586 (URN)10.1890/0012-9658(2007)88[252:DESDAB]2.0.CO;2 (DOI)
Tillgänglig från: 2008-01-28 Skapad: 2008-01-28 Senast uppdaterad: 2017-12-11
Drakare, S., Lennon, J. J. & Hillebrand, H. (2006). The imprint of the geographical, evolutionary and ecological context on species-area relationships.. Ecology Letters, 9, 215-227
Öppna denna publikation i ny flik eller fönster >>The imprint of the geographical, evolutionary and ecological context on species-area relationships.
2006 (Engelska)Ingår i: Ecology Letters, Vol. 9, s. 215-227Artikel i tidskrift (Refereegranskat) Published
Identifikatorer
urn:nbn:se:uu:diva-78942 (URN)
Tillgänglig från: 2006-03-31 Skapad: 2006-03-31 Senast uppdaterad: 2011-01-11
Hessen, D. O., Blomqvist, P., Dahl-Hansen, G., Drakare, S. & Lindström, E. S. (2004). Production and food web interactions of Arctic freshwater plankton and responses to increased DOC. Archiv für Hydrobiologie, 159(3), 289-307
Öppna denna publikation i ny flik eller fönster >>Production and food web interactions of Arctic freshwater plankton and responses to increased DOC
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2004 (Engelska)Ingår i: Archiv für Hydrobiologie, ISSN 0003-9136, Vol. 159, nr 3, s. 289-307Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A gradient of dissolved organic carbon (DOC) was added to enclosures in a high Arctic lake (Svalbard, 79 N). The aim was to simulate the effect of increased concentrations of DOC that will be a predicted effect of increased temperature and precipitation. The study aimed to provide information on the overall effects of such increased levels of DOC on the pelagic food-web, as well as the increased attenuation of UV-radiation (UV-R) caused by increased DOC. The biomass development of phytoplankton, heterotrophic bacteria and ciliates from 15. July (shortly after ice-off) to 8. August revealed a consistent pattern across all enclosures. Initial phytoplankton biomass decreased from maxima around 600g Cl-1 towards 50g Cl-1 by the end of July. Similarly, ciliate biomass decreased from ~100 to 5g Cl-1, while heterotrophic bacteria decreased from initially 280 g Cl-1 to biomasses near 100 g Cl-1. Over the same period, zooplankton biomass (almost a monoculture of Daphnia tenebrosa) increased from <40 to some 170g Cl-1. These patterns were reflected also in decreasing absolute production of bacteria and phytoplankton, while production:biomass ratio remained fairly constant. In general, the study demonstrated a very dynamic system over the brief ice-free season, where Daphnia grazing had a strong impact on the unicellular biota. Additions of DOC initially stimulated planktonic production, yet this effect was soon overruled by Daphnia grazing. This stimulating effect could be a result both of increased UV-R attenuation and some growth stimulating effect. Since no corresponding stimulating effect was observed in the bag shielded with Mylar filter to screen off UV-B, the latter cause seems most likely.

Nyckelord
Arctic, dissolved carbon, UV-radiation, plankton, Daphnia, trophic interactions
Nationell ämneskategori
Ekologi
Identifikatorer
urn:nbn:se:uu:diva-72419 (URN)10.1127/0003-9136/2004/0159-0289 (DOI)
Tillgänglig från: 2008-04-14 Skapad: 2008-04-14 Senast uppdaterad: 2017-12-14Bibliografiskt granskad
Bergström, A.-K., Jansson, M., Drakare, S. & Blomqvist, P. (2003). Occurence of mixotrophic flagellates in relation to bacterioplankton production, light regime and availability of inorganic nutrients in unproductive lakes with differing humic contents.. Freshwater Biology, 48, 868-877
Öppna denna publikation i ny flik eller fönster >>Occurence of mixotrophic flagellates in relation to bacterioplankton production, light regime and availability of inorganic nutrients in unproductive lakes with differing humic contents.
2003 (Engelska)Ingår i: Freshwater Biology, Vol. 48, s. 868-877Artikel i tidskrift (Refereegranskat) Published
Identifikatorer
urn:nbn:se:uu:diva-78941 (URN)
Tillgänglig från: 2006-03-31 Skapad: 2006-03-31 Senast uppdaterad: 2011-01-13
Drakare, S., Blomqvist, P., Bergström, A.-K. & Jansson, M. (2003). Relationships between picophytoplankton and their environment along a gradient of lakes of different water colour and nutrient content. Freshwater Biology, 48, 729-740
Öppna denna publikation i ny flik eller fönster >>Relationships between picophytoplankton and their environment along a gradient of lakes of different water colour and nutrient content
2003 (Engelska)Ingår i: Freshwater Biology, Vol. 48, s. 729-740Artikel i tidskrift (Refereegranskat) Published
Identifikatorer
urn:nbn:se:uu:diva-47538 (URN)
Tillgänglig från: 2006-03-31 Skapad: 2006-03-31 Senast uppdaterad: 2011-01-13
Ahlgren, I. & Drakare, S. (2002). Factors controlling pelagic and sediment heterotrophic bacterial numbers and production in lakes.. Verh. Internat. Verein. Limnol, 28, 792-797
Öppna denna publikation i ny flik eller fönster >>Factors controlling pelagic and sediment heterotrophic bacterial numbers and production in lakes.
2002 (Engelska)Ingår i: Verh. Internat. Verein. Limnol, Vol. 28, s. 792-797Artikel i tidskrift (Refereegranskat) Published
Identifikatorer
urn:nbn:se:uu:diva-44730 (URN)
Tillgänglig från: 2007-01-29 Skapad: 2007-01-29 Senast uppdaterad: 2011-01-13
Blomqvist, P., Jansson, M., Drakare, S., Bergström, A.-K. & Brydsten, L. (2001). Effects of additions of DOC on pelagic biota in a clearwater system: Results from a whole lake experiment in northern Sweden. Microbial Ecology, 42(3), 383-394
Öppna denna publikation i ny flik eller fönster >>Effects of additions of DOC on pelagic biota in a clearwater system: Results from a whole lake experiment in northern Sweden
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2001 (Engelska)Ingår i: Microbial Ecology, Vol. 42, nr 3, s. 383-394Artikel i tidskrift (Refereegranskat) Published
Identifikatorer
urn:nbn:se:uu:diva-38519 (URN)
Tillgänglig från: 2006-03-31 Skapad: 2006-03-31 Senast uppdaterad: 2011-01-14
Jansson, M., Bergström, A.-K., Drakare, S. & Blomqvist, P. (2001). Nutrient limitation of bacterioplankton and phytoplankton in humic lakes in northern Sweden. Freshwater Biology, 46(5), 653-666
Öppna denna publikation i ny flik eller fönster >>Nutrient limitation of bacterioplankton and phytoplankton in humic lakes in northern Sweden
2001 (Engelska)Ingår i: Freshwater Biology, Vol. 46, nr 5, s. 653-666Artikel i tidskrift (Refereegranskat) Published
Nyckelord
bacterioplankton; humic lakes; nutrient limitation; phytoplankton; whole-lake fertilization
Identifikatorer
urn:nbn:se:uu:diva-36226 (URN)
Tillgänglig från: 2007-02-13 Skapad: 2007-02-13 Senast uppdaterad: 2011-01-13
Bergström, A.-K., Jansson, M., Blomqvist, P. & Drakare, S. (2001). The influence of water colour and effective light climate on mixotrophic phytoflagellates in three small Swedish dystrophic lakes. Verh. Internat. Verein. Limnol., 27, 1861-1865
Öppna denna publikation i ny flik eller fönster >>The influence of water colour and effective light climate on mixotrophic phytoflagellates in three small Swedish dystrophic lakes
2001 (Engelska)Ingår i: Verh. Internat. Verein. Limnol., Vol. 27, s. 1861-1865Artikel i tidskrift (Refereegranskat) Published
Identifikatorer
urn:nbn:se:uu:diva-38518 (URN)
Tillgänglig från: 2006-03-31 Skapad: 2006-03-31 Senast uppdaterad: 2011-01-14
Jansson, M., Bergström, A.-K., Blomqvist, P. & Drakare, S. (2000). Allochtonous organic carbon and phytoplankton/bacterioplankton production relationships in lakes. Ecology, 81(11), 3250-3255
Öppna denna publikation i ny flik eller fönster >>Allochtonous organic carbon and phytoplankton/bacterioplankton production relationships in lakes
2000 (Engelska)Ingår i: Ecology, Vol. 81, nr 11, s. 3250-3255Artikel i tidskrift (Refereegranskat) Published
Identifikatorer
urn:nbn:se:uu:diva-41579 (URN)
Tillgänglig från: 2007-01-29 Skapad: 2007-01-29 Senast uppdaterad: 2011-01-14
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