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Responses of phytoplankton to fish predation and nutrient loading in shallow lakes: a pan-European mesocosm experiment

Bund van de, W. and Romo, S. and Villena, M.J. and Valentín, M. and Van Donk, E. and Vicente, E. and Vakkilainen, K. and Svensson, M. and Stephen, D. and Ståhl-Delbanco, A. and Rueda, J. and Moss, B. and Miracle Rosa, M. and Kairesalo, T. and Hansson, L-A. and Hietala, J. and Gyllström, M. and Goma, J. and García, P. and Fernández-Aláez, M. and Fernández-Aláez, C. and Ferriol, C. and Collings, S.E. and Bécares, E. and Balayla, D. and Alfonso, T. (2004) Responses of phytoplankton to fish predation and nutrient loading in shallow lakes: a pan-European mesocosm experiment. Freshwater Biology, 49, 1608-1618. ISSN 0046-5070.

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Official URL: http://dx.doi.org/10.1111/j.1365-2427.2004.01307.x

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 L1 P and 10 mg L1 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 m). 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]

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:11589
Deposited On:23 Nov 2011 01:00
Last Modified:31 Mar 2014 10:37

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