Trophic structure in a large assemblage of phyllostomid bats in Panama

NORBERTO P. GIANNINI; ELISABETH K. V. KALKO

OIKOS

Año: 2004 vol. 105 p. 209 - 220

0030-1299

Bats of the family Phyllostomidae are fundamental components of Neotropicalmammalian diversity and display the greatest dietary diversity seen in anymammalian family. We studied trophic structure in a species-rich local assemblage ofphyllostomids for which dietary data were collected during 10 years on Barro ColoradoIsland, Panama. Correspondence analysis of /3800 dietary records from 30 syntopic species showed a structure supporting traditional divisions of animalivorous and phytophagous phyllostomids. Putatively omnivorous species actually grouped among the latter. Phytophagous phyllostomids separated into Piper-specialists, Ficus - specialists, and eclectic plant eaters which in turn were the main consumers of flower products. Discrete dietary groups were compatible with several clades of the two current phylogenetic hypotheses of phyllostomids. We show that the trophic structure of the local contemporary assemblage is largely conservative with respect to traceable ancestral habits, strongly suggesting that overall trophic structure was likely determinedhistorically.