|Location||Philippines, Region III|
|Central coordinates||120o 29.00' East 14o 31.00' North|
|IBA criteria||A1, A2|
|Altitude||0 - 1,420m|
|Year of IBA assessment||2001|
Site description The Mariveles Mountains are in southern Bataan province, near the entrance to Manila Bay (PH010), and rise steeply from sea level to 1,420 m. An area of forest is shown there on recent forest cover maps, which is reported to include both lowland and montane forest, including mossy forest. This includes old reforestation plantations in the former Lamao Arsenal and old growth forest at the peak of Mt Mariveles.
Key Biodiversity Many of the threatened and restricted-range birds of the Luzon Endemic Bird Areas have been recorded in or near to this IBA, but there is little recent information on their status there. This is the only site in the Philippines where Ijima's Leaf-warbler has been recorded, although this species is difficult to locate and identify and presumably also winters elsewhere in the islands. It is also notable for the records of the highly threatened Isabela Oriole. This species, Luzon Striped-babbler and Furtive Flycatcher appear to have an unusual disjunct distribution, being recorded from the Bataan peninsula and the Sierra Madre in eastern Luzon. However, this may prove to be a result of gaps in the coverage of some other parts of Luzon by ornithologists. A subspecies of Elegant Tit, Parus elegans gilliardi, is only known from the Bataan peninsula.
Non-bird biodiversity: Baseline surveys of the mammals and herpetofauna have yet to be conducted in the area.
|Species||Season||Period||Population estimate||Quality of estimate||IBA Criteria||IUCN Category|
|Nisaetus philippensis||resident||2001||present||-||A1||Not Recognised|
|Green Racquet-tail Prioniturus luconensis||resident||2001||present||-||A1||Endangered|
|Ceyx melanurus||resident||2001||present||-||A1||Not Recognised|
|Isabela Oriole Oriolus isabellae||resident||2001||present||-||A1||Critically Endangered|
|Celestial Monarch Hypothymis coelestis||resident||2001||present||-||A1||Vulnerable|
|Izu Leaf-warbler Phylloscopus ijimae||winter||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)|
|Mariveles||Watershed Forest Reserve||321||protected area contained by site||321|
|IUCN habitat||Habitat detail||Extent (% of site)|
|Artificial - terrestrial||-|
Protection status The Mariveles Watershed Forest Reserve was established through R.A. 3092 in July 1996. It is proposed as a Natural Park under the NIPAS.
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Recommended citation BirdLife International (2015) Important Bird Areas factsheet: Mariveles mountains. Downloaded from http://www.birdlife.org on 29/05/2015
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