Abstract
Comparisons of ecological and reproductive data among three well-studied and two lesser-studied populations of Gonatodes humeralis in the Amazon region revealed geographic variation in adult snout-vent length, morphology, habitat distribution, perch height, and prey types. Populations were similar in size of prey, and there was no correlation of lizard body size with prey size. A population of G. humeralis in the western Amazon (Ecuador) occurred only on human-made structures and was not found in undisturbed forest. Populations in the Brazilian Amazon occurred primarily in undisturbed forest. Apparent habitat shift in Ecuador suggests that the population studied was introduced by humans. Geographical variation in ecological traits suggests the value of repeated studies in different parts of species' ranges.
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