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Oxynaia diespiter 

Scope:Global
Status_ne_offStatus_dd_offStatus_lc_offStatus_nt_offStatus_vu_offStatus_en_onStatus_cr_offStatus_ew_offStatus_ex_off

Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Bivalvia Unionoida Unionidae

Scientific Name: Oxynaia diespiter
Species Authority: Mabille, 1887

Assessment Information [top]

Red List Category & Criteria: Endangered A2ac ver 3.1
Year Published: 2013
Date Assessed: 2010-11-15
Assessor(s): Do, V.
Reviewer(s): Van Damme, D., Bogan, A.E., Tran, L. & García, N.
Justification:
Following the information from surveys conducted in the area in the past 20 years, populations of this species has been observed to be declining. A decline of about 70% of the populations is inferred for the last 10 years. The quality of its habitat is also known to be declining as a result of threats as pollution and mining. It is therefore listed as Endangered A2c.

Geographic Range [top]

Range Description: This species is distributed only in Thai Nguyen and Bac Kan provinces in northeastern Viet Nam.
Countries occurrence:
Native:
Viet Nam
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: This species is not common and there is very little information on its population. A decline of about 70% of the populations is inferred for the last 10 years based on the observations of the Can and Nhue-Day Rivers Monitoring Program (V. Do pers. comm. 2011).
Current Population Trend: Decreasing
Additional data:

Habitat and Ecology [top]

Habitat and Ecology: This species inhabits streams and rivers in midlands and mountains.
Systems: Freshwater
Generation Length (years): 8

Use and Trade [top]

Use and Trade: Local people use freshwater mussels as a ready food source and this species is sometimes also sold in markets.

Threats [top]

Major Threat(s):

Mining is the major threat to this species, and urbanization, overexploitation, deforestation and also threaten the survival of this species.

Conservation Actions [top]

Conservation Actions:

Surveys need to be conducted in Thai Nguyen and Bac Kan provinces in Viet Nam to obtain information on the population, distribution and ecological requirements of this species. Conservation actions which are needed include protection of its important habitats from direct and indirect impacts, and preventing exploitation of this species.

Classifications [top]

5. Wetlands (inland) -> 5.1. Wetlands (inland) - Permanent Rivers/Streams/Creeks (includes waterfalls)
suitability: Suitable  major importance:Yes
1. Land/water protection -> 1.2. Resource & habitat protection
3. Species management -> 3.1. Species management -> 3.1.1. Harvest management

In-Place Research, Monitoring and Planning
  Systematic monitoring scheme:Unknown
In-Place Land/Water Protection and Management
  Conservation sites identified:No
In-Place Species Management
  Harvest management plan:Unknown
In-Place Education
1. Residential & commercial development -> 1.1. Housing & urban areas
♦ timing: Ongoing ♦ scope: Majority (50-90%) ♦ severity: Slow, Significant Declines ⇒ Impact score: Medium Impact: 6 
→ Stresses
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation
  • 2. Species Stresses -> 2.1. Species mortality
  • 2. Species Stresses -> 2.2. Species disturbance

3. Energy production & mining -> 3.2. Mining & quarrying
♦ timing: Ongoing ♦ scope: Majority (50-90%) ♦ severity: Slow, Significant Declines ⇒ Impact score: Medium Impact: 6 
→ Stresses
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation
  • 2. Species Stresses -> 2.1. Species mortality
  • 2. Species Stresses -> 2.2. Species disturbance

5. Biological resource use -> 5.3. Logging & wood harvesting -> 5.3.1. Intentional use: (subsistence/small scale)
♦ timing: Ongoing ♦ scope: Majority (50-90%) ♦ severity: Slow, Significant Declines ⇒ Impact score: Medium Impact: 6 
→ Stresses
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation
  • 2. Species Stresses -> 2.1. Species mortality
  • 2. Species Stresses -> 2.2. Species disturbance

5. Biological resource use -> 5.4. Fishing & harvesting aquatic resources -> 5.4.1. Intentional use: (subsistence/small scale)
♦ timing: Ongoing ♦ scope: Majority (50-90%) ♦ severity: Slow, Significant Declines ⇒ Impact score: Medium Impact: 6 
→ Stresses
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation
  • 2. Species Stresses -> 2.1. Species mortality
  • 2. Species Stresses -> 2.2. Species disturbance

1. Research -> 1.2. Population size, distribution & trends
1. Research -> 1.3. Life history & ecology

♦  Food - human
 Local : ✓ 

Bibliography [top]

Bogan, A.E. 1993. Freshwater Bivalve Extinctions (Mollusca: Unionoida): A Search for Causes. American Zoologist 33(6): 599-609.

Brandt, R.A.M. 1974. The non-marine aquatic Mollusca of Thailand. Archiv für Molluskenkunde 105(1-4): 1-423.

Ðặng, N.T., Thai, T.B. and Phạm, V.M. 1980. Ðịnh loại động vật không xương sống nước ngọt Bắc Việt Nam [Classification of the fresh water invertebrate in Viet Nam]. Nhà Xuất bản Khoa học và Kỹ thuật [Science Publishing House], Ha Noi.

IUCN. 2011. IUCN Red List of Threatened Species (ver. 2011.1). Available at: http://www.iucnredlist.org. (Accessed: 16 June 2011).

McMahon, R.F. and Bogan, A.E. 2001. Mollusca: Bivalvia. In: J.H. Thorp and A.P. Covich (eds), Ecology and Classification of North American Freshwater Invertebrates, pp. 331–430. Academic Press, San Diego.


Citation: Do, V. 2013. Oxynaia diespiter. The IUCN Red List of Threatened Species 2013: e.T171855A6807648. . Downloaded on 10 February 2016.
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