Surprisingly few studies have examined how anole population density varies geographically, much less trying to explain why. In a recent study, McTaggart and colleagues surveyed herpetological abundance across Union Island (8.4 km2) in the Grenadines (near Grenada). Anolis aeneus was by far the most abundant herp on the island and was found almost everywhere. However, its abundance did vary from 0 to 62 individuals seen in visual encounters performed during the course of a morning and an afternoon. The sites lacking A. aeneus were a mangrove and a transect from a scrubby coastal hillock to a beach; overall, anole abundance was strongly correlated with vegetational complexity (categorized based on the number and variety of trees, height and connectedness of the canopy, and extent of human disturbance), perhaps not surprising for an arboreal lizard often found high in trees.
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