Thesis

Home range, homing and orientation in Uta stansburiana

Home range, homing and orientation in a population of Uta Stansburiana were studied over a period of thirteen months. I found the home range sizes (males 36.8 m2, females 30.7 m2 and juveniles 16.4 m2} to be smaller than those reported in previous studies, with no significant difference between adult male and female home range size. There was considerable overlap among the home ranges of both adult males and females. About 25 % of the adults of both sexes which were displaced 50 to 60 m homed. Juveniles were not observed to home. Anosmic adult lizards, those with the parietal eye covered, and normal animals oriented and homed equally well. Blind adults did not orient or home. Uta released in an open arena in the field showed significant orientation to toward their original capture site if displaced less than 40 m from their home range area were visible. Lizards farther than 40 m from their home area, or which could not see landmarks within their home area from the arena center, failed to show significant orientational ability. Lizards tested in enclosed arenas exhibited behavior related to thermoregulation rather than orientation toward home.

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