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Dipterocarpus kerrii 

Scope: Global
Language: English
Status_ne_offStatus_dd_offStatus_lc_offStatus_nt_offStatus_vu_offStatus_en_onStatus_cr_offStatus_ew_offStatus_ex_off

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Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Magnoliopsida Theales Dipterocarpaceae

Scientific Name: Dipterocarpus kerrii King

Assessment Information [top]

Red List Category & Criteria: Endangered A2cd ver 3.1
Year Published: 2017
Date Assessed: 2017-02-24
Assessor(s): Ly, V., Nanthavong, K., Pooma, R., Luu, H.T., Nguyen, H.N., Barstow, M., Vu, V.D., Hoang, V.S., Khou, E. & Newman, M.
Reviewer(s): Chua, L.S.L.
Facilitator/Compiler(s): Rivers, M.C.
Justification:
Dipterocarpus kerrii is a large tree species. It is found in the lowland evergreen forests of Thailand, Malaysia, Sumatra, the Philippines, Myanmar and the Andaman Islands. The species is assessed as Vulnerable. There has been between a 30 and 50% population reduction in the last three generations (300 years); decline is projected to continue into the future. The species is threatened by habitat loss as a consequence of forest clearance for agricultural expansion. It is also at risk due to selective logging and tapping of the species for oleoresins. It is found within some protected areas but only in one ex situ collections. It is recommended more ex situ collections of the species be produced and the species habitat be further protected. Monitoring of the species harvest, trade should also occur and genetic diversity requires assessment.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species is native to southern and south eastern Asia. The species is found in the Philippines, Myanmar, Singapore (Chong et al. 2009) Peninsular Thailand, Viet Nam, Lao PDR (Phongoudome et al. 2003) and Malaysia. It is also found on the Andaman Islands, Sumatra and Sabah (Ashton 2004). The species is found from sea level up to 700 m asl and has an estimated extent of occurrence (EOO) of over 3 million km2.
Countries occurrence:
Native:
India (Andaman Is.); Indonesia (Sumatera); Lao People's Democratic Republic; Malaysia (Peninsular Malaysia, Sabah); Myanmar; Philippines; Singapore; Thailand; Viet Nam
Additional data:
Upper elevation limit (metres):700
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:This is a common and widespread species. Within the Malaysian Permanent Reserved Forests there are an estimated 224,000 adult stems (Chua et al. 2010). The Sabah subpopulation is scattered (Ashton 2004). The species has 100 year generation length. Over the last three generations (300 years) there has been between 30% and 50% population reduction due to expansion of agriculture and exploitation for timber. The species will decline into the future but at a yet unknown rate.
Current Population Trend:Decreasing
Additional data:

Habitat and Ecology [top]

Habitat and Ecology:This large tropical tree species can grow to over 40 m tall (Singh et al. 2014). The species is considered an emergent (Ashton 2004). It is found in mixed, well drained dipterocarp forest across its range. It is usually found on hill sides and is also common along the coast (Chua et al. 2010, Ashton 2004). The species seed are wind dispersed. It produces sesquiterpenoids as defence against a variety of insect pests (Ghazoul 2016). Currently the species habitat is in decline due to clearance for agricultural expansion.
Systems:Terrestrial
Continuing decline in area, extent and/or quality of habitat:Yes
Generation Length (years):100

Use and Trade [top]

Use and Trade: This tree is used for timber (Mark et al. 2015). It belongs to the genus Dipterocarpus which produce commercially valuable medium hardwood and have the trade name Keruing. The wood is used for internal construction work (Singh et al. 2014). Trees can be found in plantations within Malaysia (Weinland 1998). The species is also tapped for oleoresins which are of great commercial value. These are used by the native Orang Asli in Peninsular Malaysia for caulking boats, to produce torches and in traditional medicine. Commercially the oil is used to produce perfumes (Jantan et al. 1990).

Threats [top]

Major Threat(s): The species is threatened by habitat loss and fragmentation. Habitat is continuing to decline in area, extent and quality due to clearance for agriculture. Individual trees are lost due to selective logging for timber. Also, trees become damaged and mortality is increased when they are tapped for oleoresins (Jantan et al. 1990). The species is known to hybridise with D. dyeri and D. grandiflorus having an adverse effect on genetic diversity of the population.

Conservation Actions [top]

Conservation Actions: This species is reported in just one ex situ collection (BGCI 2017). Further ex situ collections of this species should be made which encompass the species entire native range. The species can be found within protected areas. Within Peninsular Malaysia the species is assessed as Near Threatened but is listed as Vulnerable (B2b(iii)+c(ii)) on Sabah (Chua et al. 2010). Within Singapore the species is also considered Vulnerable (Chong et al. 2009). Dipterocarpus species are considered a priority species for conservation in many of the countries in this species native range (Luoma-aho et al. 2003). It is recommended that the species habitat be further protected and decline in its range be monitored. The species should also be monitored for trade and harvest; restrictions on uptake should be put in place where necessary. An assessment of the species genetic diversity and structure should be taken.

Citation: Ly, V., Nanthavong, K., Pooma, R., Luu, H.T., Nguyen, H.N., Barstow, M., Vu, V.D., Hoang, V.S., Khou, E. & Newman, M. 2017. Dipterocarpus kerrii. The IUCN Red List of Threatened Species 2017: e.T33013A2830703. . Downloaded on 13 December 2017.
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