Fruit preferences of Malabar Pied Hornbill Anthracoceros coronatus in Western Ghats, India

摘要

Food habits of Malabar Pied Hornbill Anthracoceros coronatus were studied from December 2000 to December 2001, in the Athikadavu valley, Western Ghats, India. A total of 147 individuals belonging to 18 fleshy-fruited tree species were monitored fortnightly. Thirteen fruit species, including five figs and eight non-figs, were recorded in the birds' diet. The overall number of tree species in fruit and fruiting individuals increased with the onset of summer, the Malabar Pied Hornbill's breeding season. The peak in fruiting is attributed to the peak in fruiting by figs. Figs formed the top three preferred food species throughout the year. During the non-breeding period (May to February), 60% of the diet was figs. During the peak breeding period (March and April), two nests were monitored for 150 hours. Ninety-eight per cent of food deliveries to nest inmates were fruits belonging to six species. Most fruits delivered at the nests constituted figs (75.6%). In addition, figs sustained hombills during the lean season and should be considered "keystone species" in the riverine forest ecosystem. Two non-fig species are also important. Habitat features and local threats at Athikadavu valley were assessed. The distribution and conservation status of Malabar Pied Hornbill in the Western Ghats was reviewed. Conservation of hornbill habitats, particularly the lowland riparian vegetation, is imperative.