Experimental Analysis of Habitat Selection and Maintenance of Genetic Variation
A major goal of evolutionary genetics is to provide explanations for the maintenance of genetic variation within populations. Among numerous possibilities that have been considered, substantial attention has been devoted to effects of heterogeneous environments (Hedrick, 1986), the basic premise being that selection pressures will then be variable in space and/or in time, and that such variable selection may play a significant role in maintaining polymorphism. Nevo (1988, and references therein) argues that there is sufficient evidence from natural populations to implicate environmental heterogeneity as a significant factor in maintaining polymorphisms. Nevertheless, he does point out that it is not at all clear what proportion of polymorphic loci are maintained by environmental heterogeneity or by other mechanisms, and emphasises the need for critical experimentation to substantiate causal ecological-genetic relationships.
KeywordsHabitat Selection Yeast Species Oviposition Preference Isofemale Line Physical Environmental Factor
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