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Population Dynamics of the Saxicolous Lizard Tropidurus itambere (Tropiduridae) in a Seasonal Habitat of Southeastern Brazil
Monique Van Sluys
Vol. 56, No. 1 (Mar., 2000), pp. 55-62
Stable URL: http://www.jstor.org/stable/3893127
Page Count: 8
You can always find the topics here!Topics: Lizards, Population ecology, Herpetology, Sex ratio, Juveniles, Wildlife habitats, Biomass, Population density, Population estimates, Species
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I studied the population dynamics of Tropidurus itambere in an outcrop formation in Valinhos, São Paulo State, southeastern Brazil. I carried out a mark-recapture study on a 1.72 ha grid from February 1993 to January 1995. I estimated density (number of individuals/ha), biomass (g/ha), sex ratio, age structure, and the observed population growth rate (r) monthly. Survival (persistence) rates of males and females were estimated between successive reproductive seasons. Density varied seasonally, increasing during the recruitment period. The observed population growth rates varied monthly and their mean value (r̄ = 0.015) was positive, though small, suggesting that this population was marginally increasing. The sex ratio of juveniles was 1:1, suggesting there is no between-sex differences in birth rate. Within adults, female-biased sex ratios occurred during the reproductive seasons (December-March), and these biases may result from the spacing pattern of adults in the habitat in these seasons. Survival rates between successive reproductive seasons did not differ statistically between sexes, although survival rates for females (0.35) were higher than for males (0.25).
Herpetologica © 2000 Herpetologists' League