Abstract
Polyacrylamide gel electrophoresis was used to examine isozyme variation in 15 populations among five species of the Varipalpus group of Aedes (Ochlerotatus) . Two related species of tree-hole breeding Aedes, A. muelleri Dyar and A. purpureipes Aitken, were also examined. Ten enzyme loci were used. Aedes sierrensis (Ludlow) displayed little variation in enzyme phenotypes throughout a 2,000-km range from San Diego, Calif., to Seattle, Wash. Two diagnostic loci (ME and IDH-1) distinguished A. sierrensis from sympatric populations of A. deserticola Zavortink in California. Also, A. monticola Belkin & McDonald and A. varipalpus (Coquillett) were distinguished by diagnostic alleles at two enzyme loci (ODH and IDH-2). A. varipalpus samples were invariant at all loci examined. Two enzymes (MDH and α-GPD) appear to characterize the Varipalpus group and distinguish it from A. muelleri and A. purpureipes . Enzymatically, the Varipalpus group is a uniform assemblage of five species, although definite frequency differences exist among all members. Genetic variability in this study is similar to that reported in other Aedes studies. Phenetic cluster analysis and distance matrix trees produce different groupings of species than those suggested by morphological studies.
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