|Location||Philippines, Region IX|
|Central coordinates||122o 3.00' East 6o 35.00' North|
|IBA criteria||A1, A2|
|Altitude||0 - 968m|
|Year of IBA assessment||2001|
Site description Basilan Island lies c.20 km south of the tip of the Zamboanga Peninsula of south-western Mindanao. It is a hilly island, with several peaks that ascend to almost 1,000 m, including Mt Kebang (Twin Peak) and Mt Mohadji. This IBA includes the forests that remain in the hilly central part of the island, which are recommended by the DENR-9 for protection under the NIPAS as the Basilan Natural Biotic Area. An area of 234 ha of primary forest is reported to remain on Mt Mohadji, which also has patches of secondary forest which cover a total area of 2,500 ha. These areas were logged more than 20 years ago, but have now regenerated. Most of this is lowland forest, with limited areas of mossy forest around the highest peaks.
Key Biodiversity Many of the threatened and restricted-range species of the Mindanao and Eastern Visayas Endemic Bird Area have been recorded on Basilan, but there is little recent information on their status there. Several of these birds were found to be relatively abundant there in the past, notably the threatened Mindanao Bleeding-heart and Celestial Monarch. It is possible that the remaining forests on the island could prove to be very important for the conservation of some of these birds. The Zamboanga Bulbul is known only from Basilan and the western half of Mindanao, a distribution that it shares with several subspecies of birds. A total of 12 subspecies are endemic to Basilan alone, the four listed above in the table plus Colasisi Loriculus philippensis dohertyi, Philippine Fairy-bluebird Irena cyanogaster melanochlamys, Streaked Ground-babbler Ptilocichla mindanensis basilanica, Brown tit-babbler Macronous striaticeps striaticeps, Philippine Tailorbird Orthotomus castaneiceps mearnsi, Rufous-tailed Jungle-flycatcher Rhinomyias ruficauda ruficauda, Yellow-bellied Whistler Pachycephala philippensis basilanica and Little Spiderhunter Arachnothera longirostra randi.
|Species||Season||Period||Population estimate||Quality of estimate||IBA Criteria||IUCN Category|
|Chinese Egret Egretta eulophotes||non-breeding||2001||present||-||A1||Vulnerable|
|Nisaetus philippensis||resident||2001||present||-||A1||Not Recognised|
|Mindanao Bleeding-heart Gallicolumba crinigera||resident||2001||present||-||A1||Vulnerable|
|Dark-eared Brown-dove Phapitreron brunneiceps||resident||2001||present||-||A1||Vulnerable|
|Alcedo argentata||resident||2001||present||-||A1||Not Recognised|
|Ceyx melanurus||resident||2001||present||-||A1||Not Recognised|
|Rufous-lored Kingfisher Todiramphus winchelli||resident||2001||present||-||A1||Vulnerable|
|Mindanao Broadbill Eurylaimus steerii||resident||2001||present||-||A1||Vulnerable|
|Celestial Monarch Hypothymis coelestis||resident||2001||present||-||A1||Vulnerable|
|Little Slaty Flycatcher Ficedula basilanica||resident||2001||present||-||A1||Vulnerable|
|Philippine Cockatoo Cacatua haematuropygia||resident||2001||present||-||A1||Critically Endangered|
|Protected area||Designation||Area (ha)||Relationship with IBA||Overlap with IBA (ha)|
|Basilan||Natural Biotic Area||4,490||protected area contains site||4,363|
|Basilan Buffer Zone||Natural Biotic Area - Buffer Zone||2,037||protected area is adjacent to site||0|
|IUCN habitat||Habitat detail||Extent (% of site)|
|Artificial - terrestrial||-|
Protection status This IBA includes part of Basilan National Park, which was declared by Proclamation No. 457 on 25 September 1939 and amended by Proclamation No. 1531 on 2 February 1976. Basilan Natural Biotic Area is recommended for protection by the DENR-9 under the NIPAS.
References Davis et al. (1995).
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Recommended citation BirdLife International (2016) Important Bird and Biodiversity Area factsheet: Basilan Natural Biotic Area. Downloaded from http://www.birdlife.org on 29/04/2016
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