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Responses of phytoplankton to fish predation and nutrient loading in shallow lakes: a pan-European mesocosm experiment
Authors:W J Van De Bund  S Romo  M J Villena  M Valentín  E Van Donk  E Vicente  K Vakkilainen  M Svensson  D Stephen  A Ståhl-Delbanco  J Rueda  B Moss  M R Miracle  T Kairesalo  L-A Hansson  J Hietala  M Gyllström  J Goma  P García  M Fernández-Aláez  C Fernández-Aláez  C Ferriol  S E Collings  E Bécares  D M Balayla  T Alfonso
Institution:Centre for Limnology, Netherlands Institute of Ecology, Nieuwersluis, The Netherlands; Department of Microbiology and Ecology, University of Valencia, Burjassot, Valencia, Spain; Department of Ecological and Environmental Sciences, University of Helsinki, Lahti, Finland; Department of Ecology/Limnology, University of Lund, Lund, Sweden; School of Biological Sciences, University of Liverpool, Liverpool, U.K.; Faculty of Biology, Department of Ecology, University of Léon, Leon, Spain
Abstract:1. The impacts of nutrients (phosphorus and nitrogen) and planktivorous fish on phytoplankton composition and biomass were studied in six shallow, macrophyte‐dominated lakes across Europe using mesocosm experiments. 2. Phytoplankton biomass was more influenced by nutrients than by densities of planktivorous fish. Nutrient addition resulted in increased algal biomass at all locations. In some experiments, a decrease was noted at the highest nutrient loadings, corresponding to added concentrations of 1 mg L?1 P and 10 mg L?1 N. 3. Chlorophyll a was a more precise parameter to quantify phytoplankton biomass than algal biovolume, with lower within‐treatment variability. 4. Higher densities of planktivorous fish shifted phytoplankton composition toward smaller algae (GALD < 50 μm). High nutrient loadings selected in favour of chlorophytes and cyanobacteria, while biovolumes of diatoms and dinophytes decreased. High temperatures also may increase the contribution of cyanobacteria to total phytoplankton biovolume in shallow lakes.
Keywords:fish  food-web interactions  mesocosm experiments  nutrients  phytoplankton composition
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