OW much genetic divergence is associated with reproductive isolation? We presently know very little about the genetic changes that accompany speci1974). The application of electrophoretic methods to the study ation (LEWONTIN of genetic variation in natural populations, however, continues to increase our knowledge of genetic changes associated with different levels of phylogenetic divergence. In the present study, we report the presence of two reproductively isolated demes of brown trout (Salmo trutta) in a small mountain lake in Sweden. Although apparently completely reproductively isolated, these demes are genetically very similar and represent one of the least genetically divergent sympatric pair of reproductively isolated populations of vertebrates. et In an earlier paper (ALLENDORFal. 1976), we presented the first results of a genetic examination of populations of Scandinavian brown trout. These results indicated a large amount of genetic differentiation between populations within a small geographic area. There was also evidence of two genetically distinct demes of brown trout coexisting in a single small lake, Lake Bunnersjoarna. A total absence of heterozygotes at a lactate dehydrogenaselocus ( L D H - I ),coupled with highly significant allele frequency differences at another locus, was interpreted as evidence of two reproductively isolated demes of
Genetics – Genetics Society of America
Published: May 1, 1979
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