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Location Philippines, Region IV
Central coordinates 120o 55.00' East  12o 48.00' North
IBA criteria A1, A2
Area 5,000 ha
Altitude 50 - 400m
Year of IBA assessment 2001

Haribon Foundation



Site description Siburan is the largest tract of lowland forest known on Mindoro. It is adjacent to the large Sablayan penal colony, which restricts access to the forest and therefore provides some degree of protection. The forest is about 30 km south-east of Sablayan, with forest on the south and east edge of the penal colony. This forest is contiguous with the patchy forests on the limestone ridge running north from Malpalon (PH043). In 1991, it was estimated that about 1,500 ha of lowland forest remains, with a similar area of unvisited montane forest further east. The lowland forest is generally closed canopy with trees of up to 25 m or more and a relatively open forest floor. There are fewer limestone outcrops causing less disruption to the canopy than at Malpalon. The small Lake Lubao borders the forest.

Key Biodiversity Most of the threatened and restricted-range lowland forest birds of the Mindoro Endemic Bird Area have been recorded recently at Siburan. It is almost certainly the largest and most important lowland forest site on Mindoro, particularly given the current relatively low level of disturbance there. The protection of this IBA probably represents the best opportunity to prevent the extinction of the highly threatened Mindoro Bleeding-heart, Black-hooded Coucal and Mindoro Hornbill. Lake Lubao, bordering the forest, holds a few waterbirds.

Non-bird biodiversity: This IBA is likely to support endemic small mammals, etc., but surveys of the mammalian fauna and herpetofauna are yet to be conducted there.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Philippine Duck Anas luzonica resident  1990-1999  present  A1  Vulnerable 
Mindoro Bleeding-heart Gallicolumba platenae resident  1990-1999  present  A1, A2  Critically Endangered 
Spotted Imperial-pigeon Ducula carola resident  1950-1959  present  A1  Vulnerable 
Black-hooded Coucal Centropus steerii resident  1990-1999  present  A1, A2  Critically Endangered 
Mindoro Hornbill Penelopides mindorensis resident  1990-1999  20 individuals  A1, A2  Endangered 
Scarlet-collared Flowerpecker Dicaeum retrocinctum resident  1990-1999  common  A1  Vulnerable 

IBA Monitoring

2013 very high not assessed low
unset
Unknown

Agricultural expansion and intensification annual & perennial non-timber crops - shifting agriculture happening now some of area/population (10-49%) moderate to rapid deterioration high
Human intrusions and disturbance work and other activities happening now majority/most of area/population (50-90%) very rapid to severe deterioration very high
Natural system modifications other ecosystem modifications happening now some of area/population (10-49%) moderate to rapid deterioration high
Over-exploitation, persecution and control of species hunting & collecting terrestrial animals - intentional use (species being assessed is the target) happening now majority/most of area/population (50-90%) very rapid to severe deterioration very high
Over-exploitation, persecution and control of species logging & wood harvesting - unintentional effects: subsistence/small scale happening now majority/most of area/population (50-90%) very rapid to severe deterioration very high

Some of site covered (10-49%)  A management plan exists but it is out of date or not comprehensive  Some limited conservation initiatives are in place  low 

Habitats

IUCN habitat Habitat detail Extent (% of site)
Wetlands (inland)   -
Forest   -
Artificial - terrestrial   -

Protection status Not officially protected.

Further web sources of information 

Alliance for Zero Extinction (AZE) species/site profile. This site has been identified as an AZE due to it containing a Critically Endangered or Endangered species with a limited range.

References Brooks et al. (1995b); Dutson et al. (1992); Evans et al. (1993a).

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Mount Siburan. Downloaded from http://www.birdlife.org on 25/12/2014

To provide new information to update this factsheet or to correct any errors, please email BirdLife