Regional versus local processes in determining zooplankton community composition of Little Rock Lake, Wisconsin, USA |
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Authors: | Lukaszewski Y; Arnott S; Frost T |
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Institution: | Center for Limnology, University of Wisconsin, Madison, WI 53706, USA; Present address: Ministry of Environment, PO Box 39, Dorset, Ontario P0A 1E0, Canada |
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Abstract: | The species present within a community result from a combination of local
and regional processes. We experimentally tested the importance of these
two processes for lake zooplankton communities by examining the ability of
additional species to persist when introduced into mesocosms in Little Rock
Lake, Wisconsin, from other nearby lakes in the Northern Highland Lake
District. We established a control treatment with only Little Rock Lake
zooplankton and two treatments that supplemented the Little Rock
communities with zooplankton from nearby lakes. Species richness declined
during the 3 weeks of the experiment so that, at the end of the third week,
the treatments with added zooplankton species had the same number of
species as the controls; increasing the initial number of species in the
community did not increase its final species richness. A plot of the mean
species richness in the local habitat against the mean species richness of
the regional pool fell below a 1:1 slope. This suggested that local
processes were more important in structuring Little Rock Lake zooplankton
communities.
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