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Summary: Proc. Nati. Acad. Sci. USA
Vol. 87, pp. 2715-2719, April 1990
Evolution
Correspondence between sexual isolation and allozyme differentiation:
A test in the salamander Desmognathus ochrophaeus
(gene frequencies/sexual isolation/genetic differentlatlon/speciation)
STEPHEN G. TILLEY*, PAUL A. VERRELLt, AND STEVAN J. ARNOLDt
*Department of Biological Sciences, Smith College, Northampton, MA 01063; and tDepartment of Ecology and Evolution, University of Chicago, 940 East
57th Street, Chicago, IL 60637
Communicated by Robert R. Sokal, January 4, 1990
ABSTRACT Ethological reproductive isolation and ge-
netic divergence across 26 protein loci were measured among
populations of the salamander Desmognathus ochrophaeus in
the southern Appalachian Mountains. Levels of ethological
isolation varied from none to complete and were statistically
significant for all but two pairings between populations inhab-
iting different mountain ranges. When geographic and genetic
distances were treated as independent variables in multiple
correlation analyses, they accounted forabouthalfthe variance
in levels of ethological isolation. When genetic distance is held
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