Grazing by large river zooplankton: a key to summer potamoplankton decline? The case of the Meuse and Moselle rivers in 1994 and 1995

  • Véronique Gosselain
  • Jean-Pierre Descy
  • Laurent Viroux
  • Célia Joaquim-Justo
  • Astrid Hammer
  • Arnaud Métens
  • Sabine Schweitzer
Conference paper
Part of the Developments in Hydrobiology book series (DIHY, volume 129)

Abstract

To explain summer declines in phytoplankton biomass in large rivers, we compared the effect of zooplankton grazing on the planktonic algae of two large European rivers, the Meuse and the Moselle. In situ grazing was measured during two years (1994 and 1995), using the Haney method. Total zooplankton community filtration rates recorded in the river Meuse ranged between 1 and 32% of the water volume filtered per day. A drastic algal decline was observed early July both years and may be explained by high densities of a rotifer-dominated zooplankton community (500–700 ind. 1−1) with more than 75% of Brachionus calyciflorus. During the summer period in 1994, when grazing was over 20%, edible algal biomass was controlled by a diversified rotifer community (up to 2500 ind. 1−1), while a non-edible algal assemblage developed. In contrast, phytoplankton biomass remained comparatively low in the Moselle throughout the low-flow period, as did zooplankton numbers during most of this time (fewer than 200 ind. l −1 during the summer period). The proportion of crustaceans in this zooplankton was rather higher than in the Meuse, and they dominated at times, in biomass as well as in numbers. Nevertheless, measured in situ grazing rates (1–15%) could not explain the low summer algal biomass, even if low filtration rates may at times represent a significant carbon loss for phytoplankton, when and where net algal production was low. As a conclusion, the role of phytoplankton — zooplankton interactions in controlling algal biomass in large rivers is discussed.

Key word

potamoplankton plankton interactions in situ grazing European rivers 

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Copyright information

© Springer Science+Business Media Dordrecht 1998

Authors and Affiliations

  • Véronique Gosselain
    • 1
  • Jean-Pierre Descy
    • 1
  • Laurent Viroux
    • 1
  • Célia Joaquim-Justo
    • 2
  • Astrid Hammer
    • 3
  • Arnaud Métens
    • 1
  • Sabine Schweitzer
    • 4
  1. 1.Laboratory of Freshwater Ecology (LFE)Facultés Universitaires Notre-Dame de la PaixNamurBelgium
  2. 2.Laboratoire d’EcotoxicologieInstitut de Zoologie, Université de LiègeLiègeBelgium
  3. 3.Erasmus student at LFEfrom the University of RostockGermany
  4. 4.Centre de Recherches Ecologiques de l’Université de MetzFrance

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