This species was previously known only from the lowland rainforests of Polillo Island, and Quezon and Aurora Provinces on Luzon Island in the Philippines, between 50–350 m asl. Its range has now been extended to the Camarines Norte, Ilocos Norte, Cagayan, and Bulacan Provinces of Luzon Island, where it occurs between 18–915 m asl (Siler et al. 2011, Brown et al. 2012). As a result of these new records, its extent of occurrence (EOO) has expanded to 48,727 km2.
Habitat and Ecology
This species inhabits arboreal microhabitats in lower montane and lowland forests, and is active in shrub-layer vegetation. Individuals have been found to be common on exposed ferns and saplings in forest gaps and along forest edges (Siler et al. 2011). It breeds by direct development, and its advertisement call is described by Siler et al. (2011).
The number of mature frogs possibly falls within the range of 100–300 individuals on Polillo Island. It was previously reported to be uncommon on eastern Luzon however, with the additional records on this island, it is now found to be common and abundant (Siler et al. 2011, Brown et al. 2012, McLeod et al. 2011, and Philippines Red List Assessment Workshop May 2017). The same study by Siler et al. (2011) also found it to be the most abundant frog encountered at most sites in the Aurora Province. Due to ongoing decline in the quality and extent of its habitat, the overall population is suspected to be decreasing.
Throughout its range, the species is threatened by habitat loss and disturbance caused by small-scale slash-and-burn agriculture, wood collection for firewood and charcoal production, and expanding human settlements (Philippines Red List Assessment Workshop May 2017). Field studies have shown that the Polillo Island subpopulation of this species is possibly in decline due to the continued destruction of the lowland dipterocarp forest. On Luzon Island, quarrying of the karst formation for limestone and marble is also a cause of forest loss.
This species range on Luzon Island includes Aurora Memorial National Park, Kalbario-Patapat Natural Park, and several Protected Landscapes.
The continued protection of the remaining forest on Polillo and Luzon should be a priority in order to ensure the long-term survival of this species, while degraded forest habitats also need to be rehabilitated.
Further work is required to improve the understanding of the species' population size, distribution, and trends.
Red List Status
Listed as Least Concern in view of its wide distribution and presumed large population.
IUCN SSC Amphibian Specialist Group 2018. Platymantis polillensis. The IUCN Red List of Threatened Species 2018: e.T17551A58474441. http://dx.doi.org/10.2305/IUCN.UK.2018-1.RLTS.T17551A58474441.en .Downloaded on 16 January 2019