Nepenthes suratensis 


Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Magnoliopsida Nepenthales Nepenthaceae

Scientific Name: Nepenthes suratensis
Species Authority: Catelano

Assessment Information [top]

Red List Category & Criteria: Critically Endangered A3c ver 3.1
Year Published: 2013
Date Assessed: 2013-01-26
Assessor(s): Clarke, C.M. & Sarunday, C.
Reviewer(s): Hilton-Taylor, C.
Contributor(s): Mayes, S.
Nepethes suratensis qualifies for a critically Endangered listing because it is suspected that the population will undergo at least an 80% reduction in the next three years (a period well within the three generation time window required) due to urban and agricultural expansion. This assessment is based on detailed knowledge of the only subpopulation (near the town of Kanchanadit) that has been surveyed. The existence of the two other subpopulations is known from anecdotal reports and these are thought to be much smaller and are probably undergoing similar declines. A further subpopulation at Tha Chana appears to have been completely lost in recent years. The region in Thailand that lies between the Isthmus of Kra and the Malaysian border has been thoroughly explored for Nepenthes in recent years, and the current extent of occurrence of N. suratensis has been established with a high degree of confidence.

Geographic Range [top]

Range Description: Nepenthes suratensis is endemic to Surat Thani Province, Thailand. It has been recorded from a small number of localities near the town of Kanchanadit, where it grows in lowland savanna and vine thickets over seasonally moist sandy substrates. It also grows on steep slopes on low hills.
Countries occurrence:
Estimated area of occupancy (AOO) - km2: 8
Continuing decline in area of occupancy (AOO): Yes
Extreme fluctuations in area of occupancy (AOO): Unknown
Estimated extent of occurrence (EOO) - km2: 8
Continuing decline in extent of occurrence (EOO): Yes
Extreme fluctuations in extent of occurrence (EOO): Unknown
Number of Locations: 3
Continuing decline in number of locations: Yes
Extreme fluctuations in the number of locations: Unknown
Lower elevation limit (metres): 10
Upper elevation limit (metres): 150
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: Only one subpopulation has been accurately surveyed to date. At present, this subpopulation comprises approximately 250 mature individuals. This is probably the largest subpopulation. The population overall is decreasing due to a variety of threats.
Current Population Trend: Decreasing
Additional data:
Number of mature individuals: 250 Continuing decline of mature individuals: Yes
Population severely fragmented: No
No. of subpopulations: 3 Continuing decline in subpopulations: Yes
Extreme fluctuations in subpopulations: Yes All individuals in one subpopulation: No

Habitat and Ecology [top]

Habitat and Ecology: Nepenthes suratensis grows in vine thickets and open shrubland over moist, sandy substrates, as well as on steep slopes on low hills, ranging from sea level up to approximately 150 m.
Systems: Terrestrial
Continuing decline in area, extent and/or quality of habitat: Yes
Generation Length (years): 10

Use and Trade [top]

Use and Trade: Nepenthes suratensis has some value in the local horticultural trade. Plants are collected from the wild for sale in local markets.

Threats [top]

Major Threat(s): The site of the main subpopulation is scheduled for urban development in the near future. If this development proceeds, this subpopulation is likely to be destroyed, leaving only two, very poorly documented subpopulations remaining in the wild.

Conservation Actions [top]

Conservation Actions: No conservation actions that directly involve wild subpopulations are currently operating. None of the subpopulations of Nepenthes suratensis lie within protected areas. The main subpopulation requires regular monitoring, given the threats of wild plant harvesting and imminent development of the site where it grows. The remaining two subpopulations need to be surveyed urgently in order to establish their size, ecology and potential threats they face.

Citation: Clarke, C.M. & Sarunday, C. 2013. Nepenthes suratensis. The IUCN Red List of Threatened Species 2013: e.T21848236A21848252. . Downloaded on 27 November 2015.
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