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Dipteronia dyeriana 

Scope: Global
Language: English
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Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Magnoliopsida Sapindales Sapindaceae

Scientific Name: Dipteronia dyeriana Henry

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(iii)+2ab(iii) ver 3.1
Year Published: 2017
Date Assessed: 2017-05-05
Assessor(s): Rivers, M.C., Barstow, M. & Crowley, D.
Reviewer(s): Zhilin, D. & Wen, X.
Facilitator/Compiler(s): Rivers, M.C.
Justification:
Dipteronia dyeriana is a tree endemic to Yunnan province in China. The species remains in only five to eight sub-populations and the population size is estimated to exceed 2,000 individuals. The number of mature individuals within this population is not known. The estimated extent of occurrence (EOO) of the species is just 139 km2 and the area of occupancy (AOO) is estimated to be between 20 and 32 km2 (based on the number of subpopulations of the species). It is also threatened by habitat loss and deterioration. The species is therefore assessed as Endangered. It is recommended the species be monitored and in situ conservation established alongside improvement in ex situ collections. The full impact of habitat change on the species should also be investigated.
Previously published Red List assessments:

Geographic Range [top]

Range Description:Dipteronia dyeriana is endemic to Yunnan, China (Zhengyi 1994-2013). The species is also expected to occur in north Viet Nam but the species has yet to be seen or collected from here. The species is found in an estimated five to eight locations giving it an AOO of 20–32 km2 (Qiu et al. 2007). The estimated EOO for this species is just 139 km2.
Countries occurrence:
Native:
China (Yunnan)
Additional data:
Estimated area of occupancy (AOO) - km2:20-32
Number of Locations:5-8
Lower elevation limit (metres):1840
Upper elevation limit (metres):2300
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:Dipteronia dyeriana is known from five to eight subpopulations. One each from Mengzi and Pingbian and the remaining six in Wenshan counties, Yunnan province, China. Population size estimated to exceed 2,000 individuals across its eight subpopulations but it is not known if these are mature individuals or not. The largest population occurs in Wenshan and made up over roughly 1,365 individuals (D. Zhiling pers. com. 2017) and the population in Pingbian is estimated to have 600 individuals (Qiu et al. 2007). All other subpopulations are of similar size (100 trees) (Qiu et al. 2007).
Current Population Trend:Unknown
Additional data:
Number of mature individuals:1000-1500

Habitat and Ecology [top]

Habitat and Ecology:Dipteronia dyreiana is a shrub or small tree, 10–15 m tall. It is self compatible but pollination by bee has also been observed. The species is found on the edges of broad leaf evergreen forests and along streams (Qiu et al. 2007).
Systems:Terrestrial
Continuing decline in area, extent and/or quality of habitat:Yes

Use and Trade [top]

Use and Trade: The species is used as an ornamental. It can also be used for oil (Zhengyi 1994-2013). A recent phytochemical study shows there might be bio-active anti-tumour properties held in the tree (BGCI China 2017)

Threats [top]

Major Threat(s): The main threat to the species is habitat deterioration and loss. Recent studies show that the species may have low genetic diversity, however this is still under investigation (Qiu et al. 2007).

Conservation Actions [top]

Conservation Actions: The species is known from a single ex situ collection (BGCI 2017). Research into the species is currently occuring at Kunming Institute of Botany where the species has also been propagated since 1992 (BGCI China 2017). The species is considered Endangered on China's National Red List (Sung and Yan 2004) and previous IUCN Red List Assessment (IUCN 1997, Gibbs and Chen 2009). The species ex situ presence should be expanded and the impact of local deforestation on the remaining populations should be investigated. It is also recommended that the remaining populations receive in situ protection.

Citation: Rivers, M.C., Barstow, M. & Crowley, D. 2017. Dipteronia dyeriana. The IUCN Red List of Threatened Species 2017: e.T32340A2815531. . Downloaded on 23 February 2018.
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