This species is known from many parts of Luzon Island, in the Philippines, between 0–2,000 m asl (Brown et al. 2012, A. Diesmos pers. comm. March 2018). It is also known from Catanduañes Island and has recently been reported from the southern parts of the Sierra Madre mountains on Luzon (A. Diesmos pers. comm. March 2018). It probably occurs a little more widely than current records suggest. Further taxonomic research is warranted to determine the true distribution of the nominal form of this species (Fuiten et al. 2011).
Habitat and Ecology
This species inhabits swift-flowing, cool mountain streams and rivers in montane rainforest. Individuals have been recorded on the banks of streams and in low over-hanging vegetation (Brown et al. 2012). Eggs are laid in streams, where the larvae develop. It is not likely to tolerate anthropogenic habitat disturbance, and always requires forest cover (A. Diesmos pers. comm. March 2018).
It is very common in many localities, especially in and around forested habitats, including secondary forest and forest edges. Due to ongoing decline in the extent and quality of its 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 has tested positive for Batrachochytrium dendrobatidis, although no ill effects or mortalities have yet been observed (Diesmos et al. 2012).
Parts of this species' range are protected in national parks, including Bataan National Park, Mounts Palay-Palay–Mataas-na-Gulod Protected Landscape, Quezon Protected Landscape. 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.
More protected areas need to be established on Luzon to protect the remaining forest on these islands, especially in the lowlands.
Further work is needed to better understand the population size, distribution, and trends.
Red List Status
Near Threatened (NT)
Listed as Least Concern in view of its wide distribution and presumed large population.
Hylarana igorota was removed from the synonymy of this species by Brown et al. (2000). It was subsequently moved from the genus Hylarana to Sanguirana by Fuiten et al. (2011). Further taxonomic research is warranted to determine the true distribution of the nominal form of this species (Fuiten et al. 2011).
IUCN SSC Amphibian Specialist Group 2018. Sanguirana luzonensis. The IUCN Red List of Threatened Species 2018: e.T58650A58481375. http://dx.doi.org/10.2305/IUCN.UK.2018-2.RLTS.T58650A58481375.en .Downloaded on 21 January 2019