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Genetic Variation in Side-Blotched Lizards on Islands in the Gulf of California

abstract1 (full description below): Evolution, Vol. 27, No. 4. (Dec., 1973), pp. 593-600.
Side-Blotched Lizards. PDF/Acrobat file     1974. Michael Soule; Suh Yung Yang

INTRODUCTION: This is the second paper concerned with the correlates and causes of variation in island populations of the side-blotched lizard (L'ta sta~zsburiana Baird and Girard, sensu lato). The first (SoulC, 1972) dealt only with the morphological variation of populations in the Gulf of California, Mexico. In that study it was found that the log of island area is the best predictor of morphological variation within local populations on islands, although distance from the mainland and other isolation variables are also important. In short, the study showed that the larger the island, the more variable the lizards, and the more remote the island, the less variable the lizards. Lye can now present the results of a survey of genetic variation in many of the same populations. The two studies are compared, and it is suggested that morphological variation may give more accurate estimates of genetic variation than does the electrophoretic data. Elsewhere (in prep.) we will use the genetic data as taxonomic characters and analyze the relationships of these populations to each other and to mainland populations in Baja California and Sonora, Mexico.