Biology and ecology of birds at Borapet reservoir in Nakorn Sawan province [in Thailand]
Obhas Khobkhet (Kasetsart Univ., Bangkok (Thailand). Faculty of Forestry. Dept. of Forest Biology)
The study of birds at Borapet Reservoir in Nakorn Sawan Province was undertaken from November, 1980 to December 1982. Observations were done monthly. Ninety-nine species of 70 genera, 33 families, and 12 orders of birds were found in 6 habitats namely: open water zone, floating weed zone, emergenced weed zone, island, swamp forest, and paddy field. They were classified as 69 residents 24 migrants, 5 residents and migrants, and 1 uncertain status. The gargancy (Anas querquedula Linnaeus), whistling teal (Dendrocygna javanica Horsfield), cotton teal (Nettapus coromaelianus Gmelin), pheasant-tailed jacana (Hydrophasianus chirurgus Scopoli) and house swift (Apus affinis J.E. Gary) were abundant, while black bittern (Dupetor flavicollis Latham), osprey (Pandion haliaetus Linnaeus), greater thick-knee (Esacus magnirostris Vieillot), whiskered tern (Chlidonias hybrida Pallas) and white-winged tern (Chlidonias leucoptera Temminck)were very rare in this area. Peak of bird species occurred in March, 1981 with 65 species. Low peak was tallied in September, 1981 with 40 species. The number of species were also related to amount of rainfall, temperature and relative humidity
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