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Description |
Geographic Range [top]
Range Description: Most Brotia species generally have relatively small distributions. B. mariae is considered to probably be endemic to the Nam Ngum drainage, central Lao PDR and at present it is not known from outside this range. It was collected at four locations within the catchment, so it is possibly present within the tributary streams where there is suitable habitat.
Countries occurrence:
Native:
Lao Peoples Democratic Republic
Additional data:
? Number of Locations: 4
Range Map: Click here to open the map viewer and explore range.
Population [top]
Population: The population size is not known, but is surely large enough to prevent extinction in the wild due to local events. Population trends are unknown but given the impacts of dams and general disturbances of river habitats it is plausible to assume this species is in decline.
Current Population Trend: Decreasing
Additional data:
Habitat and Ecology [top]
Habitat and Ecology: Fast flowing, well oxygenated water, on hard substrates like rocks, not on sandy or muddy substrates. Not in polluted or stagnant water.
Systems: Freshwater
Continuing decline in area, extent and/or quality of habitat: Yes
Use and Trade [top]
Use and Trade: Probably eaten by local people, might be sold on local markets as food.
Threats [top]
Major Threat(s): Threatening factors are damming of rivers, siltation due to erosion as caused by deforestation, water pollution, and river degradation. There is a dam on the river Ngum, downstream of all of the sites, and the species will not survive in a lacustrine environment hence construction of further dams upstream of the first dam may impact this species.
Conservation Actions [top]
Conservation Actions: Conservation required for this species includes: protecting natural habitat, fast flowing rivers and streams from damming, protecting gallery forests, and preventing pollution of water. Actions required include species monitoring to establish impact of future threats.
Citation: Köhler, F. 2012. Brotia mariae. The IUCN Red List of Threatened Species 2012: e.T191526A1987581. http://dx.doi.org/10.2305/IUCN.UK.2012-1.RLTS.T191526A1987581.en. Downloaded on 11 February 2019.
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