. The avifauna of Mt. Kitanglad, Bukidnon Province, Mindanao, Philippines. Birds; Birds. Species diversity -H- - - Philippines (% endemism) -0—Greater Mindanao (% endemism) -A- - - Mindanao (% endemism). 500 700 900 1100 1300 1500 1700 1900 2100 2300 Fig. 4. Elevational biodiversity trends: species diversity, Philippine endemism. Greater Mindanao endemism, and strict Mindanao endemism, all plotted against elevation (in m) along the 500 2250-m transect covered by the FMNH expeditions. Luzon, Kitanglad's species richness may be comparable with the total of—250 species believed to occur there (Po
. The avifauna of Mt. Kitanglad, Bukidnon Province, Mindanao, Philippines. Birds; Birds. Species diversity -H- - - Philippines (% endemism) -0—Greater Mindanao (% endemism) -A- - - Mindanao (% endemism). 500 700 900 1100 1300 1500 1700 1900 2100 2300 Fig. 4. Elevational biodiversity trends: species diversity, Philippine endemism. Greater Mindanao endemism, and strict Mindanao endemism, all plotted against elevation (in m) along the 500 2250-m transect covered by the FMNH expeditions. Luzon, Kitanglad's species richness may be comparable with the total of—250 species believed to occur there (Poulsen, 1995). Compared with these sites, Kitanglad's avifauna is similar in richness at lower elevations but richer toward higher elevations. Given the relatively broad elevational distributions of Philippine birds, we suspect that approximately 200 species may represent a limit for single lowland-to-highland transect avian diversity in the Philippines. Avifaunistic Changes—Of the —172 bird spe- cies known to be resident in the Kitanglad region, the early collectors (most prominently Salomonsen, Rabor, and Gonzales) collected 129 () (and probably sighted many more; overall field time not known). Recent field crews, during almost 4 months of intensive fieldwork at all elevations holding significant forest, as well as many months of effort by bird-watchers, detect- ed 153 () species. Hence, the early surveys did not detect as high a proportion of overall known species richness as the modern ones. However, to understand how best to interpret the results of the early surveys, it is worth examining which groups of species were better detected by the early surveys and which were better detected by the modern work. The 18 species documented historically but with no recent records in spite of intensive studies are Falco sevenis, Streptopelia bitorquata, Ninox philippensis, Hiriindapus giganteus, Alcedo atthis. Halcyon capensis, Ewystomus orientalis, Eurykiimus steerii
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Keywords: ., bookcollectionbiodiversity, bookcontributoruni, booksubjectbirds
