Orthetrum borneense 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Arthropoda Insecta Odonata Libellulidae

Scientific Name: Orthetrum borneense Kimmins, 1936

Assessment Information [top]

Red List Category & Criteria: Data Deficient ver 3.1
Year Published: 2009
Date Assessed: 2007-06-21
Assessor(s): Dow, R.A.
Reviewer(s): Kalkman, V. & Clausnitzer, V. (Odonata Red List Authority)
Orthetrum borneense is known only from the type series collected from montane forest above 1,200 m on Mount Dulit in northeastern Sarawak (on the border between Miri and Kapit divisions, overlooking the Tinjar river) in 1932. No survey has been made at a suitable altitude on Mount Dulit since the original collecting; an attempt by this G.T. Reels and this assessor (R. Dow) to reach such altitudes on the mountain failed in 2006, when approximately 500 m was the highest altitude that could be reached (Dow 2007). The Dulit range has been selectively logged, with logging activities ceasing on Mount Dulit in the early 1990s (based on information from local communities), but it appears likely that steep terrain hampered the logging process on parts of the mountain. At least part of the Dulit range is listed as a proposed national park by the Sarawak Forestry Corporation, but as logging licences for the area are still active; a national park cannot be gazetted until these licences have expired and logging activities may resume on the mountain before that time and, aware that the logging licences may not be renewed, the logging companies might clear-fell wherever it is practical. It is not possible to classify the species as other than data deficient until either further collecting is carried out at suitable altitudes in the Dulit range or the species is discovered elsewhere, however at present it appears to be severely range restricted at least; unless it is found elsewhere it seems likely that once further sampling has been carried out on the Dulit range an assessment of at least Vulnerable will be justified.

Geographic Range [top]

Range Description:Orthetrum borneense is known only from the type series collected on Mount Dulit, on the border between Miri and Kapit divisions, in northeast Sarawak (Kimmins 1936).
Countries occurrence:
Malaysia (Sarawak)
Additional data:
Lower elevation limit (metres):1200
Upper elevation limit (metres):1350
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:Known only from the type series of seven males and three females, collected in 1932 (Kimmins 1936).
Current Population Trend:Unknown
Additional data:
Population severely fragmented:Unknown

Habitat and Ecology [top]

Habitat and Ecology:Known from montane forest on Mount Dulit, Sarawak; beyond this nothing is known, but it is likely to breed in forest pools.

Threats [top]

Major Threat(s): Habitat loss due to logging and fire are major known threats. Much of the Dulit range has been selectively logged (information from local inhabitants, forestry workers and from my own experience of visiting the area in 2006), but some areas of steep terrain above 500 m appear to remain in a pristine condition. The Dulit Range is a possible future National Park; it is to be hoped that the park can be established before further logging occurs in the area.

Conservation Actions [top]

Conservation Actions: More data is urgently needed on the distribution of this species. If it is actually restricted to Mount Dulit then the proposed protection of that mountain in a national park will be a significant conservation measure, however illegal logging is likely to remain a threat.

Citation: Dow, R.A. 2009. Orthetrum borneense. The IUCN Red List of Threatened Species 2009: e.T163624A5625971. . Downloaded on 24 June 2018.
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