The avifauna of the Belalong forest, Brunei Darussalam

摘要: The areas explored were the full length of East (Main) Ridge to summit Bukit Belalong and down Sungai Temburong Belalong, West from Field Centre back much Kuala almost project boundary, a little beyond Babi. 24-hour periods mist netting carried out, 10 at Pondok Bujat, one in an alluvial forest close Babi, another along Centre. Netting was out twice Belalong. A total 218 individuals 58 species captured, which 214 57 ringed, others being net casualties. Moult weight recorded, with any changes retraps, as signs breeding activity. 198 recorded area, three identified genus only. 25 are not dependent, further 15 also likely be found outside forest. During expedition, 20 definite cases discovered involving 16 species. Within area zones recognised, namely riverside (Zone 1), slopes ridges up about 460 m 2) above 3). No true montane found. Bird demonstrate vertical stratification tall tropical forest, four levels fifth category for aerial feeders: ground level (leaf litter foragers) — species, nine exclusive this stratum; understorey 76 11 exclusive; mid 95 canopy 75 44 forest-dependent exclusively aerial, whereas other is canopy. Nine tied waterways, two (Enicurus spp.) foragers on land, (Ceyx erithacus) may some distance water. 128 (116 dependent) riparian zone 1); 139 (136 lower (up c. m, Zone 121 (114 higher (above m; ridge-top pole 14 palaearctic migrants together others, viz. Ninox scutulata Muscicapa daurica, have resident migrant populations. cycles calculated last 100 220+ days.