Angat watershed (9719)
Philippines, Asia
Site overview
KBA status: confirmed
Global KBA criteria: B2
Year of last assessment: 2006
National site name: Angat watershed
Central coordinates: Latitude: 14.9500, Longitude: 121.0333
System: terrestrial
Elevation (m): 490 to 920
Area of KBA (km2): 154.02964
Protected area coverage (%): 78.42
KBA classification: Global
Legacy site: Yes
Site details
Site description: Most of the remaining closed-canopy forests in Region III are found in Bulacan Province, principally in the Angat Dam Watershed which lies about 35 km to the north of Metro Manila. The watershed supports lowland dipterocarp stands on moderate to very rough terrain between elevations of 490 to 920 m, although much of the accessible forest is now degraded, and there are many areas of secondary bamboo. The forests here are of relatively low stature, and grow on what appear to be poor soils with no humus layer. The areas surrounding the forest are covered in sparse scrub and grassland. The forests here are essential for the water and the electricity supply of Manila, much of which is generated by the Angat Hydroelectric Dam.
Rationale for qualifying as KBA: This site qualifies as a Key Biodiversity Area of international significance that meets the thresholds for at least one criterion described in the Global Standard for the Identification of KBAs. KBA identified in the CI/CEPF Conservation Outcomes booklet for the Philippines Hotspot (2006). Taxonomy, nomenclature and threat category follow the 2004 IUCN Red List.
Additional biodiversity: The forests around Angat Dam are a popular destination for bird-watchers, and there are recent records of many of the threatened and restricted-range birds of the Luzon Endemic Bird Area. This is one of the few places where there are recent records of large flocks of Spotted Imperial-pigeon. Some of these species have also been recorded just outside the IBA at Ipo Dam, and the record of the extremely poorly known Worcester's Buttonquail there is of particular interest. Non-bird biodiversity: Mammals recorded in the area include two globally near-threatened species, Crab-Eating Macaque Macaca fascicularis and Philippine Warty Pig Sus philippensis, and the Data Deficient Philippine Brown Deer Cervus mariannus.
Habitats
Summary of habitats in KBA: Most of the remaining closed-canopy forests in Region III are found in Bulacan Province, principally in the Angat Dam Watershed which lies about 35 km to the north of Metro Manila. The watershed supports lowland dipterocarp stands on moderate to very rough terrain between elevations of 490 to 920 m, although much of the accessible forest is now degraded, and there are many areas of secondary bamboo. The forests here are of relatively low stature, and grow on what appear to be poor soils with no humus layer. The areas surrounding the forest are covered in sparse scrub and grassland. The forests here are essential for the water and the electricity supply of Manila, much of which is generated by the Angat Hydroelectric Dam.
| IUCN Habitat | Coverage % | Habitat detail |
|---|---|---|
| Artificial - Terrestrial | 33 | |
| Forest | 67 |
Threats
Summary of threats to biodiversity at KBA: Despite the importance of this watershed for the water and the electricity supply of Manila, there are communities living within the watershed and there is serious forest degradation in the vicinity of the dam. Many of the largest trees are being removed, and rattan is collected. It is estimated that the area of closed canopy forest in Bulacan Province was reduced by 47% between 1981 and 1992. Large scale trapping of Colasisi Loriculus philippensis for the bird trade has recently been observed in this IBA, and pigeons and malkohas are trapped for food.
Additional information
References: References: IUCN (1996); Lambert (1993).