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of Dissertation Presented to the Graduate Council of the University of Florida in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy THE POPULATION PHENETICS AND BEHAVIORAL ECOLOGY OF THE FLORIDA SCRUB LIZARD (SCELOPORUS WOOD I) By James Frederick Jackson June, 1972 Chairman: Dr. A. F. Carr, Jr. Major Department: Zoology Sceloporus woodi does not occupy all available sand-pine scrub habitat in Florida but is found only on the Lake Wales and northern Bartow Ridges, in the Ocala National Forest region, along the central and southern Atlantic Coast, and on the southwestern Gulf Coast. The poor dispersal is related to habitat restriction. Canonical analysis clustered S_. woodi populations according to phenetic affinity more effectively than did principal components analysis. The clusters correspond to the geographic regions above except that Lake Wales Ridge woodi are differentiated into northern and southern entities. Differentiation of populations within the geographic regions is inversely related to the opportunity for gene flow. Phenetic and paleogeographic considerations suggest an origin of S_. woodi in the Pliocene on the Lake Wales Ridge from a southwestern progenitor and dispersal northward in the early Pleistocene; dispersal occurred in the late Pleistocene from the Ocala National Forest region to the Atlantic Coast and from the Lake Wales Ridge to the Gulf Coast. Sceloporus woodi and {>. u. undulatus have different foraging tactics for exploitation of similar food resources. These differences are necessitated by differences in physiognomy between the sand-pine scrub association inhabited by S^. woodi and the longleaf-pine/turkey-oak association inhabited by S_. undulatus . On three ecotones between these plant associations, S_. woodi and S. undulatus hybridize in a very narrow zone. Habitat selection by the two species minimizes the width of the zone. No ethological reproductive isolating mechanisms were detected, and their failure to be evolved is ascribed to the minimal overlap of the species' distributions. Among twenty !S. woodi populations, levels of fluctuating asymmetry in six characters were not correlated. Hybrid zone populations showed levels of asymmetry intermediate between those for non-hybridizing populations of the two species. These results do not support a relationship between genetic coadaptation and asymmetry level .

The population phenetics and behavioral ecology of the Florida scrub lizard (Sceloporus woodi)