Feeding ecology of land birds on West Island, Aldabra Atoll, Indian Ocean: a preliminary survey

Abstract

The feeding ecology of some endemic land birds on West Island, Aldabra Atoll, was examined for a complete year, involving the observation of all bird feeding activity in eight habitats for a standard period of time. Gizzard contents of a number of birds of three selected species, considered at that time ecologically close, were examined and identified to complement observational data. Results indicated that the two species previously considered to be ecologically closer than any other two species on the atoll ( Nectarinia sovimanga and Zosterops maderaspatana ) in fact seek predominantly different foods, by differing methods, from largely dissimilar feeding stations and habitats. Conversely, several other species share largely similar feeding stations and foods, and these are discussed with reference to possible competition and the present status of certain species. Seasonal food availability and the utilization of introduced vegetation and associated fauna and flora are discussed.