| Citation |
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 14 May 2019. |
Description |
Geographic Range
NATIVE
Extant (resident)
Philippines
NUMBER OF LOCATIONS
3
UPPER ELEVATION LIMIT
500 metres
LOWER ELEVATION LIMIT
0 metres
Geographic Range in detail
ESTIMATED AREA OF OCCUPANCY (AOO) (KM²)
CONTINUING DECLINE IN AREA OF OCCUPANCY (AOO)
EXTREME FLUCTUATIONS IN AREA OF OCCUPANCY (AOO)
ESTIMATED EXTENT OF OCCURRENCE (EOO) (KM²)
3541.15
CONTINUING DECLINE IN EXTENT OF OCCURRENCE (EOO)
EXTREME FLUCTUATIONS IN EXTENT OF OCCURRENCE (EOO)
CONTINUING DECLINE IN NUMBER OF LOCATIONS
EXTREME FLUCTUATIONS IN THE NUMBER OF LOCATIONS
RANGE DESCRIPTION
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.
Population
CURRENT POPULATION TREND
Decreasing
NUMBER OF MATURE INDIVIDUALS
POPULATION SEVERELY FRAGMENTED
No
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 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.
Habitat and Ecology
SYSTEM
Terrestrial
HABITAT TYPE
Forest
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 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).
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
1.9. Forest - Subtropical/Tropical Moist Montane 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
THREATS
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).
CLASSIFICATION SCHEME
Threats Timing Stresses Scope Severity Impact score Invasive species Virus
1. Residential & commercial development 1.1. Housing & urban areas Ongoing
1. Ecosystem stresses 1.1. Ecosystem conversion
1.2. Ecosystem degradation
Low Impact: 3
2. Agriculture & aquaculture 2.1. Annual & perennial non-timber crops 2.1.1. Shifting agriculture Ongoing
1. Ecosystem stresses 1.1. Ecosystem conversion
1.2. Ecosystem degradation
Low Impact: 3
2.1.2. Small-holder farming Ongoing
1. Ecosystem stresses 1.1. Ecosystem conversion
1.2. Ecosystem degradation
Low Impact: 3
2.1.3. Agro-industry farming Future
1. Ecosystem stresses 1.1. Ecosystem conversion
1.2. Ecosystem degradation
No/Negligible Impact: 1
3. Energy production & mining 3.2. Mining & quarrying Ongoing
1. Ecosystem stresses 1.1. Ecosystem conversion
1.2. Ecosystem degradation
Low Impact: 3
5. Biological resource use 5.3. Logging & wood harvesting 5.3.3. Unintentional effects: (subsistence/small scale) [harvest] Ongoing
1. Ecosystem stresses 1.2. Ecosystem degradation
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