A Common Phylogeographic Boundary for the Sample Clauses

A Common Phylogeographic Boundary for the. Southeastern United States Eco-Region? A secondary purpose of this study is to elucidate the population genetic structure and evolutionary history of raccoons in the southeastern US to test the hypothesized phylogeographic boundary that defines the southeastern US eco-region (Avise 2000) with the highly vagile raccoon as a model system. With the advent of molecular methods, and during the initial rise in popularity of phylogeography, many faunal surveys involved taxa found in the southeastern US (Avise 2000) and facilitated the characterization of Remington’s (1968) proposed Northern Florida Suture-Zone. Comparison of these phylogeographic studies resulted in the identification of similar diversification/ differentiation patterns in unrelated species within the southeast, evident from mitochondrial DNA analyses. Broadly, freshwater and marine species tended to separate into eastern and western populations whereas populations of terrestrial species in peninsular Florida often differed from those found on the US mainland. As a result, it has been hypothesized that certain species assemblages in the southeastern US might have been influenced by shared events, glacial cycling for example, throughout their evolutionary histories and that a phylogeographic boundary in the area of the Northern Florida Suture-Zone, perhaps due to the Suwannee Strait or a similar feature during the Pleistocene, defines the southeastern US eco-region (Avise 1992; Ellsworth et al. 1994; Avise 1996; Xxxxxx and Xxxxx 1998; Xxxxx 2000). Although several examples can be gleaned from freshwater fishes (Philipp et al. 1983; Xxxxxxxxxx and Avise 1986; Swift et al. 1986; Avise 1992; Xxxxxxx et al. 1995) and costal-restricted vertebrates and invertebrates (Xxxx 1986; Avise et al. 1992; Xxxxxx and Xxxxx 1998), examples from terrestrial mammalian species have been less abundant. Of note, southeastern pocket gophers (Avise et al. 1979) and eastern woodrats (Xxxxx and Xxxxxxxx 1992) have shown patterns of genetic differentiation that could be consistent with the phylogeographic boundary hypothesis. In addition, a distinct line located near the proposed Suwannee Strait separates short-tailed shrews into 2 subspecies (Benedict et al. 2006). Interestingly, an extremely narrow contact zone of the subspecies has been detected less than 2 kilometers from the original dividing line. In all 3 of these cases, small mammals capable of limited dispersal were examined thus making it difficult to definitively...
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