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Location Philippines, Region IX
Central coordinates 122o 4.00' East  6o 53.00' North
IBA criteria A1, A2
Area 11,935 ha
Altitude 200 - 1,100m
Year of IBA assessment 2001

Haribon Foundation



Site description Pasonanca Watershed is only 7 km north of Zamboanga City at the tip of the Zamboanga Peninsula in southwestern Mindanao. It has the largest block of old growth lowland dipterocarp forest remaining in Region 9, and a DENR Protected Area Survey Assessment (PASA) reports that old growth and secondary growth forest covers about 60% of the area. The rest is agricultural land, coconut plantations and built-up areas. Rock formations and numerous rivers and springs provide additional habitats for wildlife. It has a rolling terrain with moderate to steep slopes. Tenured migrants have occupied part of the watershed since the 1950s. Since it is close to the city, housing projects have been constructed by developers at the edge of the watershed. There is also a picnic and camping area adjacent to the watershed, including a Boy Scouts of the Philippines camp. Pasonanca Watershed is the only source of potable water for Zamboanga City, and the Tumaga River also provides industrial and irrigation water for the area around the city.

Key Biodiversity Many of the threatened and restricted-range species of the Mindanao and Eastern Visayas Endemic Bird Area have been recorded in or near to Pasonanca Watershed, including recent records of the threatened Mindanao Bleeding-heart, Philippine Kingfisher, Philippine Leafbird and Little Slaty Flycatcher, and Zamboanga Bulbul, which is confined to western Mindanao and Basilan. It is likely that the good quality habitat there supports some important populations of these birds.

Populations of IBA trigger species

Species Season Period Population estimate Quality of estimate IBA Criteria IUCN Category
Philippine Cockatoo Cacatua haematuropygia resident  2001  present  A1  Critically Endangered 
Japanese Night-heron Gorsachius goisagi winter  2001  present  A1  Endangered 
Chinese Egret Egretta eulophotes non-breeding  2001  present  A1  Vulnerable 
Philippine Eagle Pithecophaga jefferyi resident  2001  present  A1  Critically Endangered 
Mindanao Bleeding-heart Gallicolumba crinigera resident  2001  present  A1  Vulnerable 
Spotted Imperial-pigeon Ducula carola resident  2001  present  A1  Vulnerable 
Giant Scops-owl Otus gurneyi resident  2001  present  A1  Vulnerable 
Alcedo argentata resident  2001  present  A1  Not Recognised 
Ceyx melanurus resident  2001  present  A1  Not Recognised 
Blue-capped Kingfisher Actenoides hombroni resident  2001  present  A1  Vulnerable 
Rufous-lored Kingfisher Todiramphus winchelli resident  2001  present  A1  Vulnerable 
Mindanao Broadbill Eurylaimus steerii resident  2001  present  A1  Vulnerable 
Azure-breasted Pitta Pitta 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 Leafbird Chloropsis flavipennis resident  2001  present  A1  Vulnerable 

Protected areas

Protected area Designation Area (ha) Relationship with IBA Overlap with IBA (ha)  
Pasonanca Natural Park 12,066 protected area contains site 11,935  
Pasonanca Buffer Zone Natural Park - Buffer Zone 5,479 protected area overlaps with site 700  

Habitats

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

Protection status Pasonanca Watershed Forest Reservation was declared by Presidential Proclamation No. 199 on 17 December 1987. The protected area covers 12,106.61 ha with a buffer zone of 5,307 ha.

References Haribon Foundation (1998).

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Recommended citation  BirdLife International (2014) Important Bird Areas factsheet: Pasonanca Natural Park. Downloaded from http://www.birdlife.org on 29/11/2014

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