Friday, April 19, 2013
to primary rainforest, in mangrove swamps, fruit orchards, along gallery forests and riparian zones in Brazilian cerrado and caatinga, as well as urban and suburban situations where they will sometimes seek shelter in human dwellings. Prey is encountered during the night via active and ambush foraging, with some species employing both strategies.
Treeboa diets are largely comprised of lizards, birds, marsupials, rodents, and/or bats; prey is killed by constriction and, like all snakes, they are gape-limited. Several species undergo ontogenetic shifts in diet (e.g. lizards to rodents), some feed on birds and mammals, and others are stenophagic for mammals as adults.
In a forthcoming paper, Henderson et al. (2013) conducted the first study of morphology and diet that considers all nine treeboa species. Using adult specimens from museum collections, they examined several morphometric and meristic variables and their possible relationship to Corallus diets.
They found three basic morphologies within the genus: (1) a short, narrow head and a slender body (C. cookii, C. grenadensis, C. hortulanus, and C. ruschenbergerii), useful for exploiting a wide variety of prey (2) a relatively stout body with a long, wide head (C. batesii, C. caninus, and C. cropanii) associated with feeding on large mammals; and (3) an intermediate morphology, found in C. annulatus and C. blombergii, which may be indicative of endotherm generalists. These morphological and dietary patterns exhibit a strong degree of congruence with a recent molecular phylogeny of Corallus and highlight a heretofore unexamined ecological diversification within Corallus.
Henderson, R. W., M. J. Pauers, and T. J. Colston. 2013. On the congruence of morphology, trophic ecology, and phylogeny in Neotropical treeboas (Squamata: Boidae: Corallus). Biological Journal of the Linnean Society.