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

Author:
  • WJ Van de Bund
  • S Romo
  • MJ Villena
  • M Valentin
  • E Van Donk
  • E Vicente
  • K Vakkilainen
  • Marie Svensson
  • D Stephen
  • Annika Ståhl-Delbanco
  • J Rueda
  • B Moss
  • MR Miracle
  • T Kairesalo
  • Lars-Anders Hansson
  • J Hietala
  • Mikael Gyllström
  • J Goma
  • P Garcia
  • M Fernandez-Alaez
  • C Fernandez-Alaez
  • C Ferriol
  • SE Collings
  • E Becares
  • DM Balayla
  • T Alfonso
Publishing year: 2004
Language: English
Pages: 1608-1618
Publication/Series: Freshwater Biology
Volume: 49
Issue: 12
Document type: Journal article
Publisher: Wiley-Blackwell

Abstract english

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 mum). 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

  • Ecology

Other

Published
  • ISSN: 0046-5070
Lars-Anders Hansson
E-mail: lars-anders [dot] hansson [at] biol [dot] lu [dot] se

Professor

Aquatic ecology

+46 46 222 41 69

E-C140

50

Professor

NanoLund

14

Research group

Aquatic Ecology

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