Abstract
The superiority of large zooplankton in suppressingphytoplankton growth has often been inferred from theSize Efficiency Hypothesis (S.E.H.). The S.E.H. hasoriginally been formulated to account for thecompetitive superiority of large to small zooplanktonunder food limiting conditions. Extrapolation of itspredictions to the suppression of phytoplankton byzooplankton under high food availability, should bedone with care. In an attempt to assess the relevanceof the S.E.H. to biomanipulation theory inhypertrophic systems, a fish exclosure experiment wascarried out in which the efficiency of two differentlystructured zooplankton communities in reducingphytoplankton biomass was examined. By inoculatingpart of the enclosures with laboratory grownDaphnia magna, a community dominated by this largecladoceran species could be compared with a communitymainly consisting of Bosmina and smallerDaphnia species. After the exclusion of fish, therewas an exponential increase of total zooplanktonbiomass. Phytoplankton growth was efficientlysuppressed to equal levels in both treatments, thoughthere was a difference in timing: chlorophyll-a levelsin the enclosures inoculated with D. magnadropped one week earlier than in non-inoculatedenclosures. The time-lag was even more pronounced whenlarge phytoplankton was considered. In accordance withthe S.E.H., the time lags could be explained bydifferences in population growth potential as well asby differences in zooplankton grazing rates(indirectly measured as the minimal zooplanktonbiomass needed to suppress phytoplankton growth) andfood particle size range.
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Declerck, S., De Meester, L., Podoor, N. et al. The relevance of size efficiency to biomanipulation theory: a field test under hypertrophic conditions. Hydrobiologia 360, 265–275 (1997). https://doi.org/10.1023/A:1003175929208
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DOI: https://doi.org/10.1023/A:1003175929208