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Activity Patterns of Alsophis sibonius and Liophis juliae (Dipsadidae) in Cabrits National Park, Dominica, West Indies

ABSTRACT. 
 Two dipsadid snakes occur on the island of Dominica, Lesser Antilles. In June 2008, we conducted visual encounter surveys to document activity periods of Alsophis sibonius and Liophis juliae at Cabrits National Park. Based on 165 observations of A. sibonius over the course of 71.25 search hours, we determined that daytime activity is bimodal and inversely correlated with temperature. Most snakes were found in moderately disturbed habitats, near trails, and on leaf litter. All nine L. juliae were observed during the morning. More individuals of both species were observed at a greater range of times on rainy days. Our data supported predictions that A. sibonius would exhibit a bimodal activity period and would extend activity when cool/rainy weather moderated periods of midday heat. Neither species appeared to be deterred by human-mediated habitat alterations, effectively exploiting stone ruins and areas near trails.