Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Magnoliopsida Nepenthales Nepenthaceae

Scientific Name: Nepenthes deaniana
Species Authority: Macfarlane
Taxonomic Notes: May be a form of N.alata.

Assessment Information [top]

Red List Category & Criteria: Near Threatened ver 3.1
Year Published: 2014
Date Assessed: 2013-08-07
Assessor(s): Clarke, C.M. & Lee, C.
Reviewer(s): Cantley, R.
Nepenthes deaniana is presently known only from the summit area on Thumb Peak (Mt Pulgar), near the town of Puerto Princessa on Palawan, Philippines. This is the type locality, but the type specimen (which was held in Manila) was destroyed during WW2. As no other Nepenthes have been seen on the summit of Thumb Peak, and the population that grows at this location matches the description of N. deaniana very well, it is assumed to represent this species. N. deaniana belongs to a group of several closely-related species that grow at or near the summits of mountain on the island of Palawan. Although N. deaniana is confined to a very small geographic area and is hence potentially Vulnerable under criterion D2, it is of little interest to horticulturists and its habitat is unlikely to suffer any significant disturbances in the foreseeable future. Public access to the mountain is strictly controlled by the management of the Iwahig Prison and Prison Farm, and very few people have visited the location where N. deaniana grows. Hence it is listed as Near Threatened as it comes close to qualifying as Vulnerable under criterion D2 and it is the ongoing conservation measures in place that keep the species secure, should access be allowed the species could decline very quickly.
Previously published Red List assessments:
2000 Data Deficient (DD)

Geographic Range [top]

Range Description: Nepenthes deaniana is presently known only from the summit area on Thumb Peak (Mt Pulgar), near the town of Puerto Princessa on Palawan, Philippines. Occurs between 1,100 and 1,240 m asl.
Countries occurrence:
Estimated area of occupancy (AOO) - km2: 8.0
Continuing decline in area of occupancy (AOO): No
Estimated extent of occurrence (EOO) - km2: 8
Continuing decline in extent of occurrence (EOO): No
Number of Locations: 1
Continuing decline in number of locations: No
Extreme fluctuations in the number of locations: No
Lower elevation limit (metres): 1100
Upper elevation limit (metres): 1240
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: The population of N. deaniana on Thumb Peak is relatively small, and appears to comprise approximately 1,000 mature individuals.
Current Population Trend: Unknown
Additional data:
Number of mature individuals: 1000 Continuing decline of mature individuals: Unknown
Extreme fluctuations: Unknown Population severely fragmented: No

Habitat and Ecology [top]

Habitat and Ecology: N. deaniana grows terrestrially in dense mossy forest and on  bare rocks around the summit of Thumb Peak in Palawan.
Systems: Terrestrial
Continuing decline in area, extent and/or quality of habitat: No

Use and Trade [top]

Use and Trade: N. deaniana has little horticulural value and is not utilized in any other ways.

Threats [top]

Major Threat(s): N. deaniana does not appear to be at risk from any specific threats at present. Its habitat is remote, rarely visited by people and is off-limits to commercial activities. The species is not prized in horticulture and is of little interest to all but the most dedicated of Nepenthes enthusiasts.

Conservation Actions [top]

Conservation Actions: Apart from its listing on CITES Appendix II, there are no specific conservation actions involving N. deaniana at present. As this species is of little horticultural interest and grows in an undisturbed habitat that is not subject to ongoing or projected anthropogenic disturbances, it appears that occasional monitoring of the site and population are the only actions needed at present.

Citation: Clarke, C.M. & Lee, C. 2014. Nepenthes deaniana. The IUCN Red List of Threatened Species 2014: e.T39653A19631578. . Downloaded on 05 October 2015.
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