公告日期 : 2012-05-10
Microhabitat Partitioning of Frugivorous Birds: Exploration by a Multiple Correspondence Analysis
Authors：Chao-Chieh Chen, Yuan-Hsun Sun, Shiang-Lin Huang, Lien-Siang Chou
Resource partitioning is one of the important strategies of niche differentiation for species that utilize similar resources, especially within a guild. We used a multiple correspondence analysis (MCA) to explore relationships in habitat use by 3 commonly seen fruit-eating birds (Taiwan Barbet Megalaima nuchalis, Black Bulbul Hypsipetes leucocephalus, and Grey-cheeked Fulvetta Alcippe morrisonia) at the Fushan Experimental Forest in northeastern Taiwan. From June 1997 to May 1998, the fruit type and vegetation level usage of these 3 bird species were recorded monthly. An MCA bi-plot graphically illustrated that the Taiwan Barbet and Black Bulbul mainly took drupes in the canopy, whereas the Grey-cheeked Fulvetta largely consumed fruit other than drupes and berries in the understory. In particular, the MCA could distinguish subtle differences between the former 2 frugivores. The bi-plot showed that the Black Bulbul used berries in the subcanopy more frequently than the Taiwan Barbet. These results support differentiated use of microhabitat by these 3 bird species. We recommend application of the MCA for its capability to clearly illustrate subtle associations among categorical variables in behavioral and habitat studies of wildlife. Key words: Black Bulbul, fruit type, Grey-cheeked Fulvetta, Taiwan Barbet, vegetation level.