This species is found in the Sierra Madres in the northeast of Luzon Island, in the Philippines, from near 0–1,200 m asl. It has also been recorded on Mount Dayap, Sitio Siete, Barangay Villa Aurora in Maria Aurora municipality, on Luzon Island (Siler et al. 2011). It is expected to occur more widely on Luzon than currently mapped (A. Diesmos pers. comm. March 2018), but the extent of occurrence (EOO) of its current known range is 17,078 km2, which is thought to represent fewer than 10 threat-defined locations.
Habitat and Ecology
This species inhabits arboreal microhabitats in lower montane and lowland forests. Breeding is by direct development. It is not likely to tolerate habitat disturbance (A. Diesmos pers. comm. March 2018).
This species is common in intact and lightly disturbed lowland forests, but is uncommon at higher elevations. Due to ongoing decline in the extent and quality of habitat, the population is suspected to be decreasing.
The major threat is habitat loss due to small-scale shifting agriculture, expanding human settlements, wood collection for firewood and charcoal production, and illegal logging by commercial entities. In addition, the construction of a major east-west road was completed in 2016 through the western part of Isabela Province and the presence of the road is anticipated to intensify illegal logging activities (Philippines Red List Assessment Workshop May 2017). In addition, nickel, chromite and gold mining are taking place within the Northern Sierra Madre and the Central Cordillera, as well as limestone and sand quarrying (Philippines Red List Assessment Workshop May 2017).
This species is known to occur in Aurora National Park. Since the 2004 assessment, in collaboration with various regional academic institutions, NGO-led awareness campaigns have been taking place to educate the public regarding the need to protect remaining forests on Luzon Island, resulting in positive responses by local communities and improved protection for priority species.
There remains a need for improved protection of the remaining forests in the Sierra Madres. Enforcement of protected area boundaries and appropriate management practices are required to safeguard the remaining habitat, as well as ongoing awareness campaigns to raise public support.
Further work is required to better understand the population size, distribution, and trends.
Red List Status
Listed as Vulnerable because its extent of occurrence (EOO) is 17,078 km2, it is thought to occur in fewer than 10 threat-defined locations, and there is continuing decline in the extent and quality of its forest habitat on Luzon in the Philippines.
Due to observed morphological, bioacoustic and ecological differences, subpopulations of this species between 300-600 m asl are thought to belong to Platymantis polillensis (Siler et al. 2011), although this needs to be verified.
IUCN SSC Amphibian Specialist Group 2018. Platymantis sierramadrensis. The IUCN Red List of Threatened Species 2018: e.T58481A58480782. http://dx.doi.org/10.2305/IUCN.UK.2018-2.RLTS.T58481A58480782.en .Downloaded on 19 January 2019