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Israel Journal of Zoology
  Issue:  Volume 47, Number 4 / 2001
  Pages:  367 - 386
  URL:  Linking Options

   Special Issue: Ecology of Temporary Pools
  Guest Editor(s): L. Blaustein and S.S. Schwartz
 
DISPERSAL OF INVERTEBRATES AMONG TEMPORARY PONDS: ARE GENETIC ESTIMATES ACCURATE?

ANDREW J. BOHONAK A1 and GEORGE K. RODERICK A1

A1 Division of Insect Biology, Department of Environmental Science, Policy and Management, University of California, 201 Wellman Hall #3112, Berkeley, California 94720-3112, USA

Abstract:

Dispersal is difficult to quantify in most temporary pond invertebrates. As a consequence, researchers often infer the movement of individuals from indirect estimates of gene flow. Here, we review the assumptions associated with the most common gene flow estimate, which approximates migration using a simple island model and assumes equilibrium. Particular attention is focused on empirical studies of temporary pond invertebrates, where nonequilibrium conditions may be particularly important. When populations have not reached a long-term equilibrium between the migration of genes and random drift, estimates of movement can be biased dramatically. Eight comparative and theoretical tests for ascertaining these biases are described here. In some cases, specific hypotheses regarding contemporary and historical processes can also be tested statistically using computer simulations. Although the accuracy of gene flow estimates in temporary pond species varies widely, empirical and theoretical methods for assessing this accuracy are almost always available.


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