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Demography of the Tree Lizard, Urosaurus ornatus, in Central Arizona
Donald W. Tinkle and Arthur E. Dunham
Vol. 1983, No. 3 (Aug. 16, 1983), pp. 585-598
Stable URL: http://www.jstor.org/stable/1444322
Page Count: 14
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The life history and demography of a population of the tree lizard, Urosaurus ornatus, were studied in a diverse lizard community in central Arizona (Maricopa Co.) from 1971-1977. At this locality tree lizards are active from mid-April through Oct. The majority of females begin vitellogenesis by late May, and development of the initial clutch requires about 30 days. Females remain reproductive until late Aug. Duration of the reproductive season is about 90 days, sufficient for production of three clutches. Individual females produce multiple clutches averaging 7.1 eggs per clutch. Both sexes attain sexual maturity at about 45 mm SVL by May-June of the year following hatching. Periods of most rapid growth are in the fall and spring following hatching. Survivorship of yearlings and adults varies among years with average adult survivorship being 11%. Life tables based on average age-specific fecundity and mortality rates result in net replacement rates ( R0) of less than 1.0. Comparative demographic data from three other detailed studies of tree lizard populations are presented and discussed.