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Primary producers o...
Primary producers or consumers? : Increasing phytoplankton bacterivory along a gradient of lake warming and browning
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- Wilken, Susanne (author)
- 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.,Monterey Bay Aquarium Research Institute,Lund University
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- Soares, Margarida (author)
- Lund University,Lunds universitet,Enhet akvatisk ekologi,Biologiska institutionen,Naturvetenskapliga fakulteten,Mikrobiologisk ekologi,Forskargrupper vid Lunds universitet,Division aquatic ecology,Department of Biology,Faculty of Science,Microbial Ecology,Lund University Research Groups
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- Urrutia Cordero, Pablo (author)
- Uppsala University,Lund University,Lunds universitet,Uppsala universitet,Limnologi,Lund Univ, Dept Biol, Aquat Ecol, Lund, Sweden,Enhet akvatisk ekologi,Biologiska institutionen,Naturvetenskapliga fakulteten,Division aquatic ecology,Department of Biology,Faculty of Science
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- Ratcovich, Jens (author)
- Lund Univ, Dept Biol, Aquat Ecol, Lund, Sweden.;Lansstyrelsen Kalmar Lan, Tillvaxt Och Miljo, Vattenenheten, Kalmar, Sweden.,Lund University,County Administrative Board, Kalmar County
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- Ekvall, Mattias K. (author)
- Lund University,Lunds universitet,Enhet akvatisk ekologi,Biologiska institutionen,Naturvetenskapliga fakulteten,Division aquatic ecology,Department of Biology,Faculty of Science
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- Van Donk, Ellen (author)
- Netherlands Inst Ecol, NIOO, KNAW, Dept Aquat Ecol, Wageningen, Netherlands.;Univ Utrecht, Dept Ecol & Biodivers, Utrecht, Netherlands.,Netherlands Institute of Ecology (NIOO-KNAW),Utrecht University
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- Hansson, Lars Anders (author)
- Lund University,Lunds universitet,Enhet akvatisk ekologi,Biologiska institutionen,Naturvetenskapliga fakulteten,Division aquatic ecology,Department of Biology,Faculty of Science
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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. Monterey Bay Aquarium Research Institute (creator_code:org_t)
- 2017-11-01
- 2018
- English.
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In: Limnology and Oceanography. - : WILEY. - 0024-3590 .- 1939-5590. ; 63:Suppl. 1, s. S142-S155
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Abstract
Subject headings
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- 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.
Subject headings
- NATURVETENSKAP -- Biologi -- Ekologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Ecology (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Oceanografi, hydrologi och vattenresurser (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Oceanography, Hydrology and Water Resources (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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