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Geographic Protein Variation and Divergence in Populations of the Salamander Plethodon cinereus

Richard Highton and T. Preston Webster
Evolution
Vol. 30, No. 1 (Mar., 1976), pp. 33-45
DOI: 10.2307/2407670
Stable URL: http://www.jstor.org/stable/2407670
Page Count: 13
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Geographic Protein Variation and Divergence in Populations of the Salamander Plethodon cinereus
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Abstract

Geographic variation at 24 polypeptide loci was studied in 24 populations of the red-backed salamander, Plethodon cinereus. At 6 loci, differentiation of the continuously distributed northern populations from the five southern isolates is complete or almost complete. The latter are recognized as a separate species, P. serratus. Differentiation within P. serratus is modest. The seven samples of P. cinereus that were collected from formerly glaciated areas are very uniform, while there is substantial divergence among the eight samples from unglaciated localities. Colonization since the last Pleistocene glaciation has apparently represented only a small portion of the diversity of the potential source area.

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