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Shorea obtusa 

Scope: Global
Language: English
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Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Magnoliopsida Theales Dipterocarpaceae

Scientific Name: Shorea obtusa Wall.

Assessment Information [top]

Red List Category & Criteria: Near Threatened ver 3.1
Year Published: 2017
Date Assessed: 2017-03-10
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:
Shorea obtusa is a large tree species. It is native to Indochina. The species is globally assessed as Near Threatened. The population has undergone a 20-29% reduction in the past three generations this due to logging and agricultural expansion. It almost qualifies for a threatened status under criterion A2cd. Logging and agricultural expansion are ongoing threats to the species it is therefore essential that population and habitat decline are monitored and remaining species habitat is protected to ensure the species does not become further threatened. The species is found within protected areas but only one ex situ collection. Further ex situ collections of the species should be made. The genetic diversity of the species in Thailand is still currently high however fragmentation of forest is predicted to cause this to decline. This is likely to be a more widespread threat to the species but this requires confirmation.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species is native to Indochina. It is recorded from Myanmar, Lao PDR, Cambodia and southern Viet Nam. The species is found up to 1,300 m asl and it has an estimated extent of occurrence (EOO) of over 1.3 million km2.
Countries occurrence:
Native:
Cambodia; Lao People's Democratic Republic; Myanmar; Viet Nam
Additional data:
Upper elevation limit (metres):1300
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:This species is abundant and widespread. It is considered a key stone species of dry forests within Thailand (Senakun et al. 2011). Within Thailand the species once persisted in a large contiguous forest but this forest is now fragmented into several smaller forest areas. Despite this, the genetic diveristy of the species currently remains high, but is likely to decline in the future (Senakun et al. 2011). Overall the population is in decline. The species has undergone a 20–29% population reduction in the past three generations (210 years). This is as consequence of logging and forest clearance for agricultural expansion.
Current Population Trend:Decreasing
Additional data:

Habitat and Ecology [top]

Habitat and Ecology:This is a large tree species and grows within dry lowland deciduous forest. The species can be found in sites with poor soils (Ghazoul et al. 2016). It is dominant component of dry forests within Thailand (Senakun et al. 2011) and flowers here within the dry season in February (Ghazoul et al. 2016). The species is able to grow within open savanna forests which are often created by fire due to its tolerance to small fires and resprouting capabilities (Ghazoul et al. 2016). The species can form ectomycorrhizal relationships (Lee et al. 1998). The species habitat is currently in decline in area and quality due to the expansion of agriculture.
Systems:Terrestrial
Continuing decline in area, extent and/or quality of habitat:Yes
Generation Length (years):70

Use and Trade [top]

Use and Trade: The tree is used for timber which can be used for house construction. The species can also be used as fire wood and produces a white resin used in torches. Cattle are grazed on the tree leaves.

Threats [top]

Major Threat(s): The species is predominantly threatened by habitat loss and conversion. The species native forest is being cleared for agricultural land, for the development of rice paddies, peanut and cashew nut forms and eucalyptus and acacia plantations. The species is also threatened by logging for the timber trade. Although the species currently exhibits high genetic diversity within Thailand, this is predicted to decline in the future as forests become more fragmented and populations become more isolated. This threatens the long term health and viability of Thai populations (Senakun et al. 2011).

Conservation Actions [top]

Conservation Actions: This species is reported from one ex situ collection (BGCI 2017). More ex situ collections of this species should be produced which are representative of the entire range. The species occurs in protected areas across its range. Within Lao PDR the species is assessed as Near Threatened (Phongoudome et al. 2003). It is recommended the remaining species habitat is protected, especially in areas which show the highest decline. Population decline of the species should be monitored. Efforts should be made to protect the genetic diversity of the species in the wake of continuing habitat loss.

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. Shorea obtusa. The IUCN Red List of Threatened Species 2017: e.T33027A2831618. . Downloaded on 25 April 2018.
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