Genetic Variability and Population Structure of Catostomus santaanae in the Santa Clara Drainage

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Abstract
Fifty specimens of C. (Pantosteus) santaanae were collected from each of 2 downstream and 2 upstream localities in the Santa Clara drainage in southern California. The 200 specimens were examined electrophoretically for the gene products of 33 presumptive loci. Four loci exhibited diallelic polymorphisms in both the upstream and downstream samples. The distribution within electromorph classes at each polymorphic locus was in agreement with Hardy-Weinberg expectations in the majority of cases. Genetic distances [D] between geographic samples were negligible; the maximum D = 0.003. Thus, a sample of C. santaanae from any site within the drainage could genetically characterize the population; however, contingency chi-square tests at 3 of the 4 polymorphic loci force rejection of the null hypothesis of random breeding throughout the drainage. The lack of rare alleles suggests a genetic bottleneck in the history of C. santaanae which could be due to the already documented decimation of the population via flooding or to an introduction involving a small number of individuals.

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