This species occurs in the rainforests of southeastern Luzon and Polillo Islands, in the Philippines, between 0–1,200 m asl. It is expected to occur more widely between known localities (A. Diesmos pers. comm. March 2018) and probably occurs at more than 10 threat-defined locations. The extent of occurrence (EOO) of its current known range is 29,752 km2.
Habitat and Ecology
It inhabits arboreal microhabitats in mossy lowland and montane rainforests, and also secondary forests (A. Diesmos pers. comm. March 2018). It breeds by direct development and deposits eggs in tree holes, arboreal Asplenium bird’s nest ferns, and Pandanus. Scheffers et al. (2014) recorded eggs from approximately one in five ferns, whereas no eggs were found in randomly sampled microhabitats adjacent to bird's nest ferns. It is not likely to tolerate any habitat disturbance (A. Diesmos pers. comm. March 2018).
It is common in forested areas and disturbed areas adjacent to forests. However, due to the impact of the ongoing decline in the quality and extent of its habitat, the population is suspected to be decreasing.
Its habitat is threatened 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). On Mount Banahaw, the southwest side of the mountain is heavily impacted by religious pilgrims and tourists who damage habitat while building campsites, but this is a small part of the species' range. Also at this site, the collection of aerial ferns and tree ferns as ornamentals represents a possible threat, as these plants are the preferred microhabitats for reproduction.
This species occurs in Mount Isarog Natural Park, Makiling National Park, Mount Banahaw-San Cristobal National Park, and its range overlaps with several other protected areas. 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.
The most important conservation measure is the continued management of protected areas. Enforcement of protected area boundaries and appropriate management practices are required to safeguard the 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
Near Threatened (NT)
Listed as Near Threatened because its extent of occurrence (EOO) is 29,752 km2, there is ongoing decline in the quality and extend of its habitat, and the number of locations likely exceeds the threshold of criterion B, making the species close to qualifying for Vulnerable.
IUCN SSC Amphibian Specialist Group 2018. Platymantis luzonensis. The IUCN Red List of Threatened Species 2018: e.T58464A58480349. http://dx.doi.org/10.2305/IUCN.UK.2018-2.RLTS.T58464A58480349.en .Downloaded on 18 January 2019