Abstract

We surveyed the genetic structure of zooplankton populations in small natural ponds to measure geographic patterns of differentiation and to evaluate the rates of genetic exchange. Populations of eight taxa (the calanoid Aglaodiaptomus clavipoides, A. conipedatus, A. stagnalis, Aglaodiaptomus sp., Onychodiaptomus sanguineus, and Osphranticum labronectum, the cladoceran Daphnia laevis, and the conchostracan Lynceus gracilicornis) were sampled from 26 ponds in the uplands and alluvial terraces of the Savannah River Site near Aiken, South Carolina, USA. Genetic divergence ○÷ was high, with values of 0.053-0.297 for three calanoid copepods and one cladoceran

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