Clinal variation and heterozygote deficit at the lap-locus in Mytilus edulis |
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Authors: | H H Lassen F J Turano |
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Institution: | (1) Institute of Ecology and Genetics, University of Aarhus, Århus, Denmark;(2) Department of Ecology and Evolution, State University of New York, Stony Brook, New York, USA |
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Abstract: | Electrophoretic investigations of Mytilus edulis populations on the New York and Connecticut coasts of Long Island Sound (USA) revealed a cline in the frequency of the Lap 94-allele at a 20 km zone at the entrance to the estuary. Significant deficits of heterozygotes were found in the region of the cline and are discussed in terms of a model of mixing between oceanic mussel populations of high gene frequency and estuarine populations of low frequency. The pattern of estuarine circulation is assumed to provide a mechanical basis for isolation between oceanic and estuarine populations and to determine the position of the gene frequency cline. |
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