| Citation |
IUCN SSC Amphibian Specialist Group 2018. Platymantis insulatus. The IUCN Red List of Threatened Species 2018: e.T17519A58473068. http://dx.doi.org/10.2305/IUCN.UK.2018-1.RLTS.T17519A58473068.en. Downloaded on 07 May 2019. |
Description |
Geographic Range
NATIVE
Extant (resident)
Philippines
NUMBER OF LOCATIONS
4
UPPER ELEVATION LIMIT
600 metres
LOWER ELEVATION LIMIT
0 metres
Geographic Range in detail
Population
CURRENT POPULATION TREND
Decreasing
NUMBER OF MATURE INDIVIDUALS
POPULATION SEVERELY FRAGMENTED
Yes
CONTINUING DECLINE OF MATURE INDIVIDUALS
Population in detail
EXTREME FLUCTUATIONS
NO. OF SUBPOPULATIONS
CONTINUING DECLINE IN SUBPOPULATIONS
EXTREME FLUCTUATIONS IN SUBPOPULATIONS
ALL INDIVIDUALS IN ONE SUBPOPULATION
NO. OF INDIVIDUALS IN LARGEST SUBPOPULATION
DESCRIPTION
It is common on all four islands and abundant in appropriate atmospheric conditions (heavy rains). In fact, the 2014 surveys found the species to be more abundant than previously thought (Philippines Red List Assessment Workshop May 2017). However, due to ongoing decline in the extent and quality of habitat, the population is suspected to be decreasing, and the species was found to be relatively less abundant in area with disturbed habitat (i.e. with non-native vegetation). As 100% of the population is spread across four islands between which there is no dispersal, it is considered to be severely fragmented.
Habitat and Ecology
SYSTEM
Terrestrial
HABITAT TYPE
Forest, Rocky areas (eg. inland cliffs, mountain peaks), Caves and Subterranean Habitats (non-aquatic)
GENERATION LENGTH (YEARS)
CONGREGATORY
MOVEMENT PATTERNS
Not a Migrant
CONTINUING DECLINE IN AREA, EXTENT AND/OR QUALITY OF HABITAT
Yes
Habitat and Ecology in detail
HABITAT AND ECOLOGY
This species inhabits limestone karst forest and caves in forested lowlands; during 2014 surveys, only eight of the 10 Gigantes islands were found to contain suitable habitat and the species was recorded only on four of these islands (Philippines Red List Assessment Workshop May 2017). Individuals have often been recorded from the most moist and coolest parts of caves (Bucol et al. 2010). The species breeds by direct development and gravid females have been found to contain 22-24 eggs on each ovary (Bucol et al. 2010). Juveniles have been observed in cave entrances in Gigante Sur, and a month later froglets have been observed outside of these caves on the moist forest floor (Bucol et al. 2010). It is suspected that eggs are hatched inside the caves or deep crevices and that the juveniles only go outside to feed, although this requires further research (Bucol et al. 2010).
CLASSIFICATION SCHEME
Habitats Suitability Major importance
1. Forest 1.5. Forest - Subtropical/Tropical Dry Suitable Yes
1.6. Forest - Subtropical/Tropical Moist Lowland Suitable Yes
6. Rocky areas (eg. inland cliffs, mountain peaks)
7. Caves and Subterranean Habitats (non-aquatic) 7.1. Caves and Subterranean Habitats (non-aquatic) - Caves Suitable Yes
Threats
Residential & commercial development
Housing & urban areas
Agriculture & aquaculture
Annual & perennial non-timber crops
Energy production & mining
Mining & quarrying
Biological resource use
Logging & wood harvesting
Threats in detail |
