Cuernos de Negros (9766)
Philippines, Asia
Site overview
KBA status: confirmed
Global KBA criteria: A1e, B2
Year of last assessment: 2018
National site name: Cuernos de Negros
Central coordinates: Latitude: 9.2667, Longitude: 123.1333
System: marine, terrestrial
Elevation (m): 300 to 1864
Area of KBA (km2): 235.82506
Protected area coverage (%): 31.98
KBA classification: Global
Legacy site: Yes
Site details
Site description: This IBA includes the remaining forests of the Cuernos de Negros, an extensive mountain range in southern Negros Oriental province. The highest peaks are around Mt Talinis, which rises to 1,864 m, and are still covered with primary mid-mountain and mossy forest. On the eastern slopes of the mountains continuous forest descends to 1,100 m, and there are degraded patches on steep slopes down to 850 m. The forest is primary but clearance for agriculture has been extensive in the valleys and on some hillsides, reaching 1,300 m. To the north of Mt Talinis there are substantial areas of primary and secondary lowland dipterocarp forest around the twin lakes at Balinsasayao, with some patches of secondary growth in recently cleared areas. These two small crater lakes are separated by a narrow mountain ridge, and situated in a hollow between four mountains, Mt Mahungot to the south, Mt Kalbasaan to the north, Mt Balinsasayao to the east and Mt Guintabon to the west of the Twin Lakes. Lake Balinsasayao lies to the north-west of the ridge and Lake Danao to the south-east. Some lowland forest remains in the Dumaguete City watershed at c.300-500 m. In the past, the most extensive tracts of lowland forest were on the western side of the Cuernos de Negros, but there is little recent information on the status of the forests in this insurgency-troubled and remote part of the IBA. The area around Mt Talinis is under the jurisdiction of the Philippine National Oil Corporation (PNOC), which has a large geothermal power plant lower down the mountain. Negros Geothermal Reservation covers 133,000 ha, of which an area of 4,096 ha was reported to be forested in 1987. The forests of this IBA are the watershed for all of southern Negros Island. The Twin Lakes area is sparsely populated by subsistence farmers.
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. Alliance for Zero Extinction (2018): site confirmed as an AZE site during the AZE project (2015-2018). Taxonomy, nomenclature and Red List category follow the IUCN 2016 Red List.
Additional biodiversity: Most of the threatened and restricted-range species of the Negros and Panay Endemic Bird Area have been recorded in the Cuernos de Negros. The extensive montane forests there support important populations of several of these species, notably Negros Striped-babbler, which remains locally common in this IBA and is otherwise only known by a single record in Mt Canlaon National Park (PH063). The low altitude forests around Lake Balinsasayao and in the poorly known western section of the Cuernos de Negros may prove to support important populations of several of the lowland and lower montane specialists which are endemic to this EBA, including Visayan and Writhed-billed Hornbills, White-winged Cuckoo-shrike, Flame-templed Babbler, White-throated Jungle-flycatcher and Visayan Flowerpecker. Non-bird biodiversity: The critically endangered Philippine Spotted Deer Cervus alfredi, Visayan Warty Pig Sus cebifrons and Negros Shrew Crocidura negrina occur in this IBA. This area includes some of the last known habitat for the Negros endemic Naked-backed Fruit Bat Dobsonia chapmani (which may already be extinct). It also supports populations of other large fruit bats, including the critically endangered Philippine Tube-nosed Fruit Bat Nyctimene rabori, the endangered Golden-crowned Flying Fox Acerodon jubatus and the vulnerable Little Golden-mantled Flying Fox Pteropus pumilus.
Habitats
Summary of habitats in KBA: This IBA includes the remaining forests of the Cuernos de Negros, an extensive mountain range in southern Negros Oriental province. The highest peaks are around Mt Talinis, which rises to 1,864 m, and are still covered with primary mid-mountain and mossy forest. On the eastern slopes of the mountains continuous forest descends to 1,100 m, and there are degraded patches on steep slopes down to 850 m. The forest is primary but clearance for agriculture has been extensive in the valleys and on some hillsides, reaching 1,300 m. To the north of Mt Talinis there are substantial areas of primary and secondary lowland dipterocarp forest around the twin lakes at Balinsasayao, with some patches of secondary growth in recently cleared areas. These two small crater lakes are separated by a narrow mountain ridge, and situated in a hollow between four mountains, Mt Mahungot to the south, Mt Kalbasaan to the north, Mt Balinsasayao to the east and Mt Guintabon to the west of the Twin Lakes. Lake Balinsasayao lies to the north-west of the ridge and Lake Danao to the south-east. Some lowland forest remains in the Dumaguete City watershed at c.300-500 m. In the past, the most extensive tracts of lowland forest were on the western side of the Cuernos de Negros, but there is little recent information on the status of the forests in this insurgency-troubled and remote part of the IBA. The area around Mt Talinis is under the jurisdiction of the Philippine National Oil Corporation (PNOC), which has a large geothermal power plant lower down the mountain. Negros Geothermal Reservation covers 133,000 ha, of which an area of 4,096 ha was reported to be forested in 1987. The forests of this IBA are the watershed for all of southern Negros Island. The Twin Lakes area is sparsely populated by subsistence farmers.
| IUCN Habitat | Coverage % | Habitat detail |
|---|---|---|
| Forest | 67 | |
| Artificial - Terrestrial | 33 |
Threats
Summary of threats to biodiversity at KBA: The Twin Lakes area has been logged in the past and illegal commercial logging is continuing to be a problem. The illegal cutting of timber is believed to be reducing the inflow of water to the lakes and causing a fall in water levels. There is also some kaingin agriculture and conversion of forest to vegetable gardens. Hunting and snaring occurs, and the collection of canes, rattans and tree ferns. The Twin Lakes area is a catchment forest, and a local government reforestation project was run from a bunkhouse there in 1991. The staff reported that some illegal kaingineros have already been evicted from within the forest. However, reforestation was not taking place on the cleared land beyond the forest boundary, but in remaining lowland forest, where strips or blocks of undergrowth were cleared to replant with seedlings of commercially desirable species. This is likely to have a great impact on the forest structure there.
Additional information
References: Brooks et al. (1992); Davies et al. (1990); Diesmos and Pedregosa (1995); Erickson and Heideman (1983); Heaney et al. (1992); Pa-alan (1993); Scott (1989).