. The avifauna of Mt. Kitanglad, Bukidnon Province, Mindanao, Philippines. Birds; Birds. logged in 1974-1975. but the 'Twin Peaks" of Mt. Dulang-Dulang were completely covered with primary forest. Upriver toward Kitan- glad. broad forested areas burned because of lightning years ago; they were covered with high grass and charred remains of trees. Work was concentrated at 1000-1600 m. occasion- ally up to 2100 m. TB and GD visited the Dalwangan area on 3-6 Oct. 1991. making extensive opportunis- tic observations up to 1600 m; other infor- mation was kindly provided by visiting bird- watche
. The avifauna of Mt. Kitanglad, Bukidnon Province, Mindanao, Philippines. Birds; Birds. logged in 1974-1975. but the 'Twin Peaks" of Mt. Dulang-Dulang were completely covered with primary forest. Upriver toward Kitan- glad. broad forested areas burned because of lightning years ago; they were covered with high grass and charred remains of trees. Work was concentrated at 1000-1600 m. occasion- ally up to 2100 m. TB and GD visited the Dalwangan area on 3-6 Oct. 1991. making extensive opportunis- tic observations up to 1600 m; other infor- mation was kindly provided by visiting bird- watchers. Finally, we summarize records from historical natural history museum collections (abbrevia- tions provided when specific specimens are cited in the text): Academy of Natural Sciences of Philadelphia (ansp). Bell Museum of Natural History. California Academy of Sciences, Dela- ware Museum of Natural History (dmnh). Field Museum of Natural History (fmnh). Florida State Museum (fsm), Los Angeles County Museum of Natural History, Museum of Verte- brate Zoology. Philippine National Museum (pnm), Silliman University Natural Science Mu- seum (sunsm). University of Kansas Natural History Museum (kunhm). Western Foundation of Vertebrate Zoology. Yale Peabody Museum (ypm), Naturmuseum Senkenberg (smf), and Zoological Museum of the University of Copen- hagen (ZMUC). The seasonal distribution of collecting and birding trips reviewed here is given in Figure 2. When recent survey data were sufficiently extensive, we evaluated the completeness of our inventories using quantitative methodologies (Soberon & Llorente. 1993; Peterson & Slade. 1998). These approaches consist of extrapolation from known fauna sizes to predicted fauna sizes and then use of both figures to arrive at estimates of percent completeness of inventory data. In particular, we used the bootstrapped Chao equation approach (Peterson & Slade. 1998). in which species richness is predicted as •Jexp — '^obs T c
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