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Primary producers or consumers?: Increasing phytoplankton bacterivory along a gradient of lake warming and browning
Lund Univ, Dept Biol, Aquat Ecol, Lund, Sweden.;Inst Marine Sci, ICM, CSIC, Barcelona, Spain.;Univ Amsterdam, IBED, FAME, Dept Freshwater & Marine Ecol, Amsterdam, Netherlands..
Lund Univ, Dept Biol, Aquat Ecol, Lund, Sweden.;Monterey Bay Aquarium Res Inst, Moss Landing, CA 95039 USA.;Lund Univ, Dept Biol, Microbial Ecol, Lund, Sweden..
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Lund Univ, Dept Biol, Aquat Ecol, Lund, Sweden.ORCID iD: 0000-0001-9560-8374
Lund Univ, Dept Biol, Aquat Ecol, Lund, Sweden.;Lansstyrelsen Kalmar Lan, Tillvaxt Och Miljo, Vattenenheten, Kalmar, Sweden..
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2018 (English)In: Limnology and Oceanography, ISSN 0024-3590, E-ISSN 1939-5590, Vol. 63, no Suppl. 1, p. S142-S155Article in journal (Refereed) Published
Abstract [en]

Eukaryotic phytoplankton form the basis of aquatic food webs and play a key role in the global carbon cycle. Many of these evolutionarily diverse microalgae are also capable of feeding on other microbes, and hence simultaneously act both as primary producers and consumers. The net ecosystem impact of such mixotrophs depends on their nutritional strategy which is likely to alter with environmental change. Many temperate lakes are currently warming at unprecedented rates and are simultaneously increasing in water color (browning) due to increased run-off of humic substances. We hypothesized that the resulting reduction in light intensity and increased bacterial abundances would favor mixotrophic phytoplankton over obligate autotrophs, while higher temperatures might boost their rates of bacterivory. We tested these hypotheses in a mesocosm experiment simulating a gradient of increasing temperature and water color in temperate shallow lakes as expected to occur over the coming century. Mixotrophs showed a faster increase in abundance under the climate change scenario during spring, when they dominated the phytoplankton community. Furthermore, both bacterial abundances and rates of phytoplankton bacterivory increased under future climate conditions. Bacterivory contributed significantly to phytoplankton resource acquisition under future climate conditions, while remaining negligible throughout most of the season in treatments resembling today's conditions. Hence, to our knowledge, we here provide the first evidence for an increasing importance of bacterivory by phytoplankton in future temperate shallow lakes. Such a change in phytoplankton nutritional strategies will likely impact biogeochemical cycles and highlights the need to conceptually integrate mixotrophy into current ecosystem models.

Place, publisher, year, edition, pages
WILEY , 2018. Vol. 63, no Suppl. 1, p. S142-S155
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Ecology Oceanography, Hydrology and Water Resources
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URN: urn:nbn:se:uu:diva-350893DOI: 10.1002/lno.10728ISI: 000427077300010OAI: oai:DiVA.org:uu-350893DiVA, id: diva2:1209014
Funder
Swedish Research Council FormasAvailable from: 2018-05-21 Created: 2018-05-21 Last updated: 2018-05-21Bibliographically approved

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Urrutia Cordero, Pablo

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