Abstract
During summer, Chaoborus punctipennis larval densities in the water column of fishless, eutrophic Triangle Lake become very high, and coincidently, the spined loricate rotifer Kelfcottia bostoniensis becomes the dominant zooplankter. Research was done to test the hypothesis that selective predation by Chaoborus on soft-bodied rotifers controls species dominance in the mid-summer zooplankton of this lake. In situ predation experiments showed positive selection by Chaoborus for the soft-bodied Synchaeta oblonga, negative selection for K. bostoniensis, and intermediate selection for Polyarthra vulgaris, a species with rapid escape tactics. However, during a 21 day in situ mesocosm experiment, zooplankton dominance and succession in Chaoborus-free enclosures was identical to that in enclosures with Chaoborus at lake density. Despite the selective predation, Chaoborus larvae may not exert significant top-down control on rotifers, whose intense reproductive output during mid-summer in temperate eutrophic lakes results in new individuals at rates that exceed predatory losses.
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Havens, K.E. Chaoborus predation and zooplankton community structure in a rotifer-dominated lake. Hydrobiologia 198, 215–226 (1990). https://doi.org/10.1007/BF00048636
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DOI: https://doi.org/10.1007/BF00048636