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Poropuntius solitus 

Scope: Global
Language: English
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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Actinopterygii Cypriniformes Cyprinidae

Scientific Name: Poropuntius solitus Kottelat, 2000
Taxonomic Notes: This is one of four species of Poropuntius known from the Bolaven Plateau. Roberts (1998) had described three as trophic morphs of P. bolovensis (i.e., individuals of the same species that develop different morphologies to adapt to different ecological conditions). Kottelat (2000) treated them as different species because he found differences that are not trophic related and are present in juveniles before they develop trophic specialisation, and described a fourth species. This community of four species or morphs on the top of an isolated plateau is a rare biological phenomenon and studies are needed to clear the taxonomy of these species or morphs. The four species/morphs occur together and up to now there are no data linking each to a specific habitat.

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(i,iii,v) ver 3.1
Year Published: 2013
Date Assessed: 2011-11-11
Assessor(s): Kottelat, M.
Reviewer(s): Allen, D. & Smith, K.
Justification:
This species is only found in the eastern half of the Bolovens Plateau, southern Lao PDR, which has an estimated area of approximately 2,500 km² (extent of occurrence). Numbers are currently inferred to be decreasing due to heavy fishing pressure, however the biggest threat to this species are planned dams (Xe Pian-Xe Namoy; to be built within the next few years) which are likely to have a significant impact on this species. Two dams under development will have a negative effect on the entire species, and it therefore is counted at two locations. There is continuing decline in the quality and area of its habitat due to habitat conversion for agriculture. It is therefore assessed as Endangered.

This is one of four species of Poropuntius known from Bolaven Plateau with specialised morphology. The taxonomy is not very clear and this is a rare biological phenomenon on top of an isolated plateau. Research is needed to clear the taxonomy of these species or morphs. This is also an interesting system for research on evolution.
Previously published Red List assessments:

Geographic Range [top]

Range Description:Known at present only from tributaries of the Xe Kong River on the eastern half of the Bolaven Plateau, Lao PDR. The species has an estimated Extent of Occurrence of  approximately 2,500 km².
Countries occurrence:
Native:
Lao People's Democratic Republic
Additional data:
Continuing decline in extent of occurrence (EOO):Yes
Number of Locations:2
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:Populations are inferred to be declining as a result of fishing pressure, and are expected to decline as a result of hydropower dams.
Current Population Trend:Decreasing
Additional data:
Continuing decline of mature individuals:Yes
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:Streams with clear, cool and fast water, over stones, rocks, rapids and waterfalls.
Systems:Freshwater
Continuing decline in area, extent and/or quality of habitat:Yes
Movement patterns:Unknown

Use and Trade [top]

Use and Trade: This species is utilised as part of local subsistence fisheries.

Threats [top]

Major Threat(s): This species is threatened by overfishing, dam construction, habitat degradation from agriculture and bauxite mining on the plateau.

Conservation Actions [top]

Conservation Actions: No conservation actions are in place. Further research is required for this species.

Citation: Kottelat, M. 2013. Poropuntius solitus. The IUCN Red List of Threatened Species 2013: e.T181047A22600492. . Downloaded on 15 October 2018.
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