This species occurs in the rainforests of Romblon, Tablas, and Sibuyan Islands in the Philippines, between sea level up to 500 m asl (Siler et al. 2012, A. Diesmos pers. comm. March 2018). It is thought to be restricted to Romblon Island Group Pleistocene Aggregate Island Complex (PAIC) (A. Diesmos pers. comm. March 2018) where its extent of occurrence (EOO) is 3,541 km2, representing three threat-defined locations.
Habitat and Ecology
This species inhabits the forest floor stratum in lower montane and lowland forests. It has a microhabitat preference for the banks of fast-flowing streams, and individuals have been observed on rocks mid-stream and on the banks of rivers and streams (Siler et al. 2012). When disturbed, it will jump into flowing water (Siler et al. 2012). It breeds by direct development. It is not likely to tolerate habitat disturbance (A. Diesmos pers. comm. March 2018).
It is very common in forested areas throughout its range (A. Diesmos pers. comm. March 2018). Due to ongoing decline in the extent and quality of habitat, the population is suspected to be decreasing.
The subpopulation on the smaller islands of Tablas are particularly threatened by continuing habitat loss due to small-scale logging, conversion of lowland rainforest to agricultural land, and marble quarrying (Philippines Red List Assessment Workshop May 2017). On Sibuyan, massive deforestation was observed caused by collection for firewood and charcoal making, in addition to widespread artisanal gold mining (Philippines Red List Assessment Workshop May 2017).
The subpopulation on Sibuyan Island is generally well protected.
The most important conservation measure needed at present is the improved protection of forests both inside and outside of protected areas, and the designation of the remaining rainforests as protected areas.
Further survey work is needed to determine the current population status of the species.
Red List Status
Listed as Endangered, because its extent of occurrence (EOO) is 3,541 km2, it occurs in three threat-defined locations, and there is a continuing decline in the extent and quality of its forest habitat in the Philippines.
IUCN SSC Amphibian Specialist Group 2018. Platymantis levigatus. The IUCN Red List of Threatened Species 2018: e.T17537A58474030. http://dx.doi.org/10.2305/IUCN.UK.2018-2.RLTS.T17537A58474030.en .Downloaded on 20 January 2019