Marine Biology Research
Developmental stability, environment-dependent selection, heterozygote deficiency, Mytilus
The multiple discrete hybrid zones that characterize Mytilus blue mussels allow a novel, non-manipulative, examination of the selective pressures that create and maintain species. If endogenous genetic incompatibility is solely responsible for postzygotic isolation, then individuals of a specified hybrid genotype are expected to show similar average fitness across environments. However, if hybrid fitness differs across environments, then exogenous selection is implicated, either via ecological selection or environment-specific expression of intrinsic genetic incompatibilities. Correspondence between developmental instability of hybrids and heterozygote deficiency, estimated in two M. trossulus x M. galloprovincialis hybrid zones on the coast of North America, indicates that environment-dependent selection against hybrids may contribute to reproductive isolation among Pacific Mytilus species.
Springer, Stevan A. and Heath, Daniel D.. (2007). Environment-specific heterozygote deficiency and developmental instability in hybrid Mytilus. Marine Biology Research, 3, 182-187.
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