This species is found in the Sierra Madres, on north-eastern Luzon Island, in the Philippines. Its extent of occurrence (EOO) is 17,160 km2 and it probably occurs in two to five threat-defined locations.
Habitat and Ecology
This semi-aquatic, arboreal species inhabits cool streams and rivers in lower montane and lowland forests. It breeds and lays its eggs in water, and it is presumed that tadpoles develop in water.
It is thought to be quite common from its known localities (Siler et al. 2011). Surveys in 2009 in southern Sierra Madre Mountain Range, Aurora Province in central Luzon Island recorded this species (Siler et al. 2011). The species was not documented during extensive montane surveys at the northern tip of Luzon (Mt. Cagua, Municipality of Gonzaga, Brown et al. 2013). 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 has been recorded from Aurora Memorial National Park.
The most important conservation measure required is the protection of the remaining tracts of intact lowland rainforest in the Sierra Madres of Luzon.
An improved understanding of the species' population size, distribution and trends is needed.
Red List Status
Listed as Vulnerable because its extent of occurrence (EOO) is 17,160 km2, it probably occurs at two to five threat-defined locations, and there is continuing decline in the extent and quality of its forest habitat on Luzon in the Philippines.
This species was moved from the genus Hylarana to Sanguirana by Fuiten et al. (2011).
IUCN SSC Amphibian Specialist Group 2018. Sanguirana tipanan. The IUCN Red List of Threatened Species 2018: e.T58739A58481969. http://dx.doi.org/10.2305/IUCN.UK.2018-1.RLTS.T58739A58481969.en .Downloaded on 21 January 2019