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Ansonia longidigita 

Scope: Global
Language: English
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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Amphibia Anura Bufonidae

Scientific Name: Ansonia longidigita Inger, 1960
Common Name(s):
English Long-fingered Slender Toad, Long-fingered Stream Toad
Taxonomic Source(s): Frost, D.R. 2014. Amphibian Species of the World: an Online Reference. Version 6 (27 January 2014). New York, USA. Available at: http://research.amnh.org/herpetology/amphibia/index.html. (Accessed: 27 January 2014).

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2018
Date Assessed: 2018-03-06
Assessor(s): IUCN SSC Amphibian Specialist Group
Reviewer(s): Luedtke, J.
Contributor(s): Iskandar, D., Das, I., Lakim, M., Mediyansyah, Munir, M., Kamsi, M., Yambun, P., Inger, R.F., Stuebing, R. & Pui, Y.
Facilitator/Compiler(s): Luedtke, J., Neam, K., Hobin, L.
Justification:
Listed as Least Concern in view of its wide distribution and presumed large population.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This Bornean endemic is known from throughout Kalimantan (Indonesia), Brunei, and Sabah and Sarawak (Malaysia). It is present in relatively steep terrain from 150–2,200 m asl.
Countries occurrence:
Native:
Brunei Darussalam; Indonesia (Kalimantan); Malaysia (Sabah, Sarawak)
Additional data:
Lower elevation limit (metres):150
Upper elevation limit (metres):2200
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:It is known to be abundant at its known localities. There are some localised habitat loss that may be causing some declines, however the population is considered to be relatively stable (P. Yambun pers. comm. January 2018).
Current Population Trend:Stable
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:Adults can be found on the floor and herb stratum of lowland and montane rainforests. It has also been recorded from old secondary forest and selectively logged forest (Inger et al. 2017), provided that clear water is maintained and available (P. Yambun pers. comm. January 2018). It requires small, clear, rocky-bottomed streams to breed in, an environment that persists only where forest cover is intact. Larvae live in torrents, clinging to rocks and feeding on lithophytes.
Systems:Terrestrial; Freshwater
Continuing decline in area, extent and/or quality of habitat:Yes
Movement patterns:Not a Migrant

Use and Trade [top]

Use and Trade: There are no records of this species being utilized.

Threats [top]

Major Threat(s): The principal threat to the species is rapid clear-cutting of lowland tropical rainforest in forest concession land and for oil palm plantations (Indonesia Red List Assessment Workshop May 2017). The subsequent siltation of streams is an additional threat. In Sarawak, the lowland forest range of this species outside of protected areas is threatened by logging concessions, small scale subsistence logging and agriculture, and oil palm plantations (I. Das and Y.M. Pui pers. comm. March 2018).

Conservation Actions [top]

Conservation Actions: Conservation Actions
This species is known to occur in several protected areas throughout Borneo. In Sabah, it occurs in many well-protected areas, including Kinabalu and Crocker Range National Parks, Danum Valley Conservation Area, Tawau Hills Park, and Imbak Canyon Conservation Area. However, in Kalimantan, some of the existing forest preserves and parks are not well protected as local use of the forests causes degradation.

Conservation Needed
Effective preservation of lowland forest is needed to conserve this species because oil palm plantations are encroaching into protected areas. Some oil palm companies and forestry companies designate High Conservation Value areas, which is required by some financial institutions providing loans. However, not all lenders require these areas to be set aside and the habitat within the HCVs could disappear if the lender or requirements change (Indonesia Red List Assessment Workshop May 2017).

Research Needed
More information is needed on this species' distribution, population status, and trends.

Classifications [top]

1. Forest -> 1.6. Forest - Subtropical/Tropical Moist Lowland
suitability:Suitable season:resident major importance:Yes
1. Forest -> 1.9. Forest - Subtropical/Tropical Moist Montane
suitability:Suitable season:resident major importance:Yes
5. Wetlands (inland) -> 5.1. Wetlands (inland) - Permanent Rivers/Streams/Creeks (includes waterfalls)
suitability:Suitable season:resident major importance:Yes
1. Land/water protection -> 1.1. Site/area protection
1. Land/water protection -> 1.2. Resource & habitat protection
2. Land/water management -> 2.1. Site/area management

In-Place Research, Monitoring and Planning
In-Place Land/Water Protection and Management
  Occur in at least one PA:Yes
In-Place Species Management
In-Place Education
2. Agriculture & aquaculture -> 2.1. Annual & perennial non-timber crops -> 2.1.2. Small-holder farming
♦ timing:Ongoing    
→ Stresses
  • 1. Ecosystem stresses -> 1.1. Ecosystem conversion
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

2. Agriculture & aquaculture -> 2.1. Annual & perennial non-timber crops -> 2.1.3. Agro-industry farming
♦ timing:Ongoing    
→ Stresses
  • 1. Ecosystem stresses -> 1.1. Ecosystem conversion
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

5. Biological resource use -> 5.3. Logging & wood harvesting -> 5.3.1. Intentional use: (subsistence/small scale) [harvest]
♦ timing:Ongoing    
→ Stresses
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

5. Biological resource use -> 5.3. Logging & wood harvesting -> 5.3.2. Intentional use: (large scale) [harvest]
♦ timing:Ongoing    
→ Stresses
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

9. Pollution -> 9.3. Agricultural & forestry effluents -> 9.3.2. Soil erosion, sedimentation
♦ timing:Ongoing    
→ Stresses
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

1. Research -> 1.2. Population size, distribution & trends
3. Monitoring -> 3.1. Population trends

Bibliography [top]

Das, I. 2007. Amphibians and reptiles of Brunei. Natural History Publications (Borneo), Kota Kinabalu.

Inger, R.F. 1960. A review of the Oriental toads of the genus Ansonia Stoliczka. Fieldiana: Zoology 39: 473-503.

Inger, R.F. 1966. The systematics and zoogeography of the Amphibia of Borneo. Fieldiana: Zoology 52: 1-402.

Inger, R.F. 1992. Variation of apomorphic characters in stream-dwelling tadpoles of the bufonid genus Ansonia (Amphibia: Anura). Zoological Journal of the Linnean Society 105: 225-237.

Inger, R.F. and Stuebing, R.B. 1997. A Field Guide to the Frogs of Borneo. Borneo Natural History Publishers, Kota Kinabalu, Malaysia.

Inger, R., Stuebing, R., Grafe, U. and Dehling, M. (eds). 2017. A Field Guide to the Frogs of Borneo. Natural History Publications, Kota Kinabulu.

IUCN. 2018. The IUCN Red List of Threatened Species. Version 2018-1. Available at: www.iucnredlist.org. (Accessed: 28 June 2018).

Malkmus, R., Manthey, U., Vogel, G., Hoffmann, P. and Kosuch, J. 2002. Amphibians and reptiles of Mount Kinabalu (North Borneo). A.R.G. Gantner Verlag K.G., Ruggell, Liechtenstein.


Citation: IUCN SSC Amphibian Specialist Group. 2018. Ansonia longidigita. The IUCN Red List of Threatened Species 2018: e.T54473A114916400. . Downloaded on 17 August 2018.
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