| Citation |
IUCN SSC Amphibian Specialist Group 2017. Theloderma ryabovi. The IUCN Red List of Threatened Species 2017: e.T136002A87450322. http://dx.doi.org/10.2305/IUCN.UK.2017-2.RLTS.T136002A87450322.en. Downloaded on 08 May 2019. |
Description |
Geographic Range
NATIVE
Extant (resident)
Viet Nam
NUMBER OF LOCATIONS
2
UPPER ELEVATION LIMIT
1,210 metres
LOWER ELEVATION LIMIT
1,210 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)
2736
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 currently known only from 1,210 m Asl at a single locality in Kon Tum Province, central Viet Nam (Orlov et al. 2006). This is unlikely to represent the actual limits of the species range as similar habitat and elevations to those in its known locality occur in adjacent areas including south into north-eastern Gia Lai Province. Further surveys in these areas may uncover its presence, therefore its range has been projected beyond known sites to include these areas of suitable habitat. This species EOO is 2,736 km2, which consists of two threat-defined locations.
Population
CURRENT POPULATION TREND
Decreasing
NUMBER OF MATURE INDIVIDUALS
POPULATION SEVERELY FRAGMENTED
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
Nothing is currently known about the size of this species population except that it is known from only three adults and a number of juvenile individuals that were detected in a single survey (Orlov et al. 2006), despite the areas surrounding its type locality having been surveyed many times (J. Rowley pers. comm. December 2015). It is unclear whether this is due to true rarity or cryptic behaviour, and further research is needed to determine the species true abundance. Deforestation continues to affect habitat in the species range (Meyfroidt and Lambin 2008, Sodhi et al. 2009, Meyfroidt et al. 2013), and is very likely causing some declines.
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 is associated with montane primary forest and has been observed in trees 4m above the ground (Orlov et al. 2006). The species is a phytotelm breeder and reproduction presumably commences prior to April, during which time three adults including at least one male as well as tadpoles and metamorphs of different stages have been observed together in a tree hole partly filled with 20 cm of water (Orlov et al. 2006).
CLASSIFICATION SCHEME
Habitats Suitability Major importance
1. Forest 1.9. Forest - Subtropical/Tropical Moist Montane Suitable Yes
Threats
Agriculture & aquaculture
Annual & perennial non-timber crops
Transportation & service corridors
Roads & railroads
Threats in detail
THREATS
Habitat loss and degradation due to the effects of rapidly expanding agriculture is an ongoing threat to biodiversity throughout Southeast Asia (Sodhi et al. 2009). In the Central Highlands of Viet Nam large areas of forest are converted to agricultural land to grow cash crop plantations (e.g. rubber, coffee and tea) (Meyfroidt and Lambin 2008, Meyfroidt et al. 2013). Recent satellite imagery reveals areas of land cleared for agriculture throughout parts of this species range. The construction of roads in this area has also degraded habitat (T. Nguyen pers. comm. December 2015).
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
2. Species Stresses 2.2. Species disturbance
Unknown Unknown Unknown
2.1.3. Agro-industry farming Ongoing
1. Ecosystem stresses 1.1. Ecosystem conversion
1.2. Ecosystem degradation
2. Species Stresses 2.1. Species mortality
2.2. Species disturbance
Unknown Unknown Unknown
4. Transportation & service corridors 4.1. Roads & railroads Ongoing
1. Ecosystem stresses 1.2. Ecosystem degradation
Unknown Unknown |
