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Effects of zooplankton on sedimentation in pelagic ecosystems: Theory and test in two lakes of the Canadian shield

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Abstract

A simple heuristic theory based on conservation of matter and describing the fate of autotrophic production in pelagic ecosystems was developed to assist in conceptualizing how zooplankton affect sedimentation processes in lakes and oceans. The theory predicted that effects of zooplankton on the fraction of autotrophic incorporation that sediments (the “export ratio”) will be a function of factors related both to zooplankton digestion and egestion and to tendencies of particulate matter to sediment directly prior to mineralization. As a result, effects of zooplankton grazing on the export ratio were predicted to be site-dependent, a function of physical conditions and zooplankton communities characterizing an ecosystem. The theory was tested by monitoring autotrophic production of C, N, and P, sedimentation of C, N, and P, and zooplankton biomass in two lakes of the Canadian shield characterized by contrasting morphometry and food-web structure. In Lake 110, a small elongate lake protected from wind exposure, export ratios of C, N, and P declined strongly with zooplankton biomass. In contrast, in L240, a larger lake with considerably greater wind exposure, export ratios increased with zooplankton biomass. These results were consistent with predictions of our theory that effects of zooplankton on sedimentation processes will depend on the tendency of particulate matter to directly sediment relative to the tendency of egested materials to sediment. However, no significant differences in relationships between export ratios for C, N, and P and zooplankton biomass were found.

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Authors and Affiliations

  1. Department of Zoology, Arizona State University, Tempe, AZ, 85287-1501, USA

    James J. Elser & Dean K. Foster

  2. Department of Fisheries and Oceans, Freshwater Institute, Winnipeg, MB, R3T 2N6, Canada

    Robert E. Hecky

Authors
  1. James J. Elser
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  2. Dean K. Foster
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  3. Robert E. Hecky
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Elser, J.J., Foster, D.K. & Hecky, R.E. Effects of zooplankton on sedimentation in pelagic ecosystems: Theory and test in two lakes of the Canadian shield. Biogeochemistry 30, 143–170 (1995). https://doi.org/10.1007/BF02186411

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  • DOI: https://doi.org/10.1007/BF02186411

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