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Zooplankton, phytoplankton and the microbial food web in two turbid and two clearwater shallow lakes in Belgium
Muylaert, K.; Declerck, S.; Geenens, V.; Van Wichelen, J.; Degans, H.; Vandekerkhove, J.; Van Der Gucht, K.; Vloemans, N.; Rommens, W.; Rejas, D.; Urrutia, R.; Sabbe, K.; Gillis, M.; Decleer, K.; De Meester, L.; Vyverman, W. (2003). Zooplankton, phytoplankton and the microbial food web in two turbid and two clearwater shallow lakes in Belgium. Aquat. Ecol. 37(2): 137-150. dx.doi.org/10.1023/A:1023988702926
In: Aquatic Ecology. Springer: Dordrecht; London; Boston. ISSN 1386-2588, more
Peer reviewed article  

Available in  Authors 
    VLIZ: Open Repository 56627 [ OMA ]

Keywords
    Biomanipulation; Eutrophic lakes; Food webs; Microbiology; Pelagic environment; Phytoplankton; Shallow water; Suspended particulate matter; Turbidity; Zooplankton; Belgium, West-Vlaanderen, Blankaart L. [Marine Regions]; Belgium, West-Vlaanderen, De Maten L. [Marine Regions]; Fresh water
Author keywords
    alternative stable states; biomanipulation; eutrophic shallow lakes; macrophytes; phytoplankton; zooplankton

Authors  Top 
  • Muylaert, K., more
  • Declerck, S., more
  • Geenens, V., more
  • Van Wichelen, J., more
  • Degans, H., more
  • Vandekerkhove, J.
  • Van Der Gucht, K., more
  • Vloemans, N.
  • Rommens, W., more
  • Rejas, D.
  • Urrutia, R.
  • Sabbe, K., more
  • Gillis, M., more
  • Decleer, K., more
  • De Meester, L., more
  • Vyverman, W., more

Abstract
    Components of the pelagic food web in four eutrophic shallow lakes in two wetland reserves in Belgium ('Blankaart' and 'De Maten') were monitored during the course of 1998-1999. In each wetland reserve, a clearwater and a turbid lake were sampled. The two lakes in each wetland reserve had similar nutrient loadings and occurred in close proximity of each other. In accordance with the alternative stable states theory, food web structure differed strongly between the clearwater and turbid lakes. Phytoplankton biomass was higher in the turbid than the clearwater lakes. Whereas chlorophytes dominated the phytoplankton in the turbid lakes, cryptophytes were the most important phytoplankton group in the clearwater lakes. The biomass of microheterotrophs (bacteria, heterotrophic nanoflagellates and ciliates) was higher in the turbid than the clearwater lakes. Biomass and community composition of micro- and macrozooplankton was not clearly related to water clarity. The ratio of macrozooplankton to phytoplankton biomass - an indicator of zooplankton grazing pressure on phytoplankton - was higher in the clearwater when compared to the turbid lakes. The factors potentially regulating water clarity, phytoplankton, microheterotrophs and macrozooplankton are discussed. Implications for the management of these lakes are discussed.

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