Graduate Thesis Or Dissertation
 

A dietary and morphometric analysis of sceloporine (Iguanidae) lizard populations

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/7s75dg138

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  • Analyses of sympatric and allopatric populations of Sceloporus occidentalis and S. graciosus from central Oregon indicate a high degree of similarity in diet. Relative abundance, the equivalent number of equally common taxa (E), and the probability of similarity (SIMI) were used in the analyses. Shifts in diet between populations of S. occidentalis can be attributed to subtle differences in available prey rather than interspecific competition for food with its sympatric congener. Both the diets and available prey exhibited temporal variation at all collection sites. The allopatric and sympatric S. occidentalis populations had significantly different body sizes. Absence of significant differences in ratios of metric variables between the populations indicated no difference in overall body shapes. The shift in body size should be attributed to factors other than interspecific dietary competition between the sympatric congeners. Examination of 19 morphological characters in populations of S. occidentalis from Santa Barbara County, California, and three counties from Oregon (Deschutes, Harney, and Jackson) revealed significant degrees of concordance in the morphometric analysis. The results initially suggest that the central population (Santa Barbara) was less variable than the peripheral populations--contrary to a generally accepted observation. The high levels of variation in the peripheral populations were most likely derived from the lumping of small isolated populations within each county. The four populations of S. occidentalis could be separated by the variation of metric characters using canonical correlation analysis. The Santa Barbara populations separated from the Oregon populations according to limb characteristics while each Oregon population separated along a gradient associated with skull characteristics.
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