Abstract
Abstract Guana is a 297-ha island in the British Virgin Islands, a private wildlife sanctuary where human activity is largely restricted to small areas associated with an upscale resort hotel. Guana is free of mongooses and sustains a population of racers (Borikenophis portoricensis; Dipsadidae). Between 2001 and 2012 we marked B. portoricensis with Trovan passive integrated transponders and recorded 394 captures of 367 unique adults (males = 167; females = 200; sex ratio of 0.8 : 1) in an effective trapping area of 25.8 ha. Using contemporary capture–recapture models, we estimated annual adult apparent survival, abundance, and realized population growth. We detected no difference in apparent adult annual survival of males (0.50, 95% confidence interval [CI] = 0.34–0.66) and females (0.50, 95% CI = 0.33–0.66). Recapture probabilities of males (0.09, 95% CI = 0.04–0.18) and females (0.08, 95% CI = 0.04–0.16) were similarly indistinguishable. Annual estimates of adult abundance ranged from 368 to 540, but c...
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