| Citation |
IUCN SSC Amphibian Specialist Group 2018. Platymantis paengi. The IUCN Red List of Threatened Species 2018: e.T135858A114723984. http://dx.doi.org/10.2305/IUCN.UK.2018-1.RLTS.T135858A114723984.en. Downloaded on 14 May 2019. |
Description |
Geographic Range
NATIVE
Extant (resident)
Philippines
NUMBER OF LOCATIONS
2
UPPER ELEVATION LIMIT
300 metres
LOWER ELEVATION LIMIT
180 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)
507.3
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 is endemic to Panay Island in the Philippines (Siler et al. 2007). It was previously known only from its type locality at 180–300 m asl on Mount Lihidan in the Municipality of Pandan in Antique Province (Siler et al. 2007). However, further work has extended the range on the northwest Panay peninsula and it is now also known from several localities in Antique and Aklan Provinces, and the northern part of the Central Panay Mountain Range (Antique Province) (Gaulke 2011). The extent of occurrence (EOO) has therefore increased from 11 km2 to 507 km2 and it is considered to occur at two 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
The species is generally uncommon within its range (Gaulke 2011), but has been observed to be quite common during periods of heavy rain in the region. It is believed that this species maintains healthy subpopulations in the karst forests of northwestern Panay. However, due to ongoing decline in the quality and extent of its habitat, the population is suspected to be decreasing.
Habitat and Ecology
SYSTEM
Terrestrial
HABITAT TYPE
Forest, Rocky areas (eg. inland cliffs, mountain peaks)
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
The species is a karst forest obligate. It is suspected that, of the main factors needed for this species to survive in these karst forests, moisture content within the forest and rocky crevices is critical (C. Siler pers. comm.). Males call from either the top of rock outcroppings or from within crevices in the rock formations (Siler et al. 2007). The species appears to be adaptable to a certain extent, as the type locality contains secondary-growth forest, but it is not clear whether or not it can tolerate complete opening up of its habitat. As the forest gets more heavily destroyed, the karst patches will eventually become more arid and possibly less suitable for this species (C. Siler pers. comm.). It is presumed to breed by direct development without dependence of water.
CLASSIFICATION SCHEME
Habitats Suitability Major importance
1. Forest 1.6. Forest - Subtropical/Tropical Moist Lowland Suitable Yes
6. Rocky areas (eg. inland cliffs, mountain peaks)
Threats
Agriculture & aquaculture
Annual & perennial non-timber crops
Energy production & mining
Mining & quarrying
Biological resource use
Logging & wood harvesting
Threats in detail
THREATS
There is widespread forest destruction at its type locality due to expanding local agriculture and nearly all surrounding soil-dominated habitat around karst patches on Panay has been heavily disturbed by farming (Siler et al. 2007, C. Siler pers. comm. 2008). However, the habitat is protected to some extent from agricultural expansion as it is very difficult to farm on the very rocky terrain, which may provide some protection for this unique forest microhabitat (C. Siler pers. comm. 2008). Additional threats, include the degradation of the forest for the harvesting of non-timber products (Gaulke 2011) and some limestone mining and quarrying is occurring within the karst formation on this island, which presents a direct threat to the habitat of this species (C. Siler pers. comm. 2008).
CLASSIFICATION SCHEME
Threats Timing Stresses Scope Severity Impact score Invasive species Virus
2. Agriculture & aquaculture 2.1. Annual & perennial non-timber crops 2.1.2. Small-holder farming Ongoing
1. Ecosystem stresses 1.1. Ecosystem conversion
1.2. Ecosystem degradation
Low Impact: 3
3. Energy production & mining 3.2. Mining & quarrying Ongoing
1. Ecosystem stresses 1.2. Ecosystem degradation
Low Impact: 3
5. Biological resource use 5.3. Logging & wood harvesting 5.3.5. Motivation Unknown/Unrecorded Ongoing
1. Ecosystem stresses 1.2. Ecosystem degradation |
