Affiliation: | Laboratoire Populations, Genetique, et Evolution, Centre National de la Recherche Scientifique, 91198 Gif-sur-Yvette, Cedex, France,;Laboratoire de Biometrie, Biologie Evolutive, Universite Lyon, 43 Boulevard du 11 Novembre, 69622 Villeurbanne Cedex, France,;Department of Biology, Box 8795, College of William &Mary, Williamsburg, Virginia 23187–8795, USA, and;Department of Biology, Box 351800, University of Washington, Seattle, Washington 98195–1800, USA |