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Description |
Geographic Range [top]
Range Description: This species is known only from the Mekong River (Poirier, 1881). Brandt (1974) reported that the species was not known from Thailand, but Davis (1982) has records from Lao PDR and there are voucher specimens in ANSP collections suggesting that the species is known from the following locations:
Ban Na Village, shore of Khong Island and into rapids, Khong Province, Mekong River, Lao PDR Voucher (ANSP 331556)
River, Khong Island, Sithandone Prov. Lao PDR (Voucher ANSP 346855)
Sampamit Falls, Mekong River, Sithandone Prov. Lao PDR (14.6.30N; 105.51.30E) Voucher (ANSP 335946 [Records from various years of collecting)
Sompamit Falls, Sithandone Province, Mekong River, Lao PDR (13.57N; 105.55E) (ANSP 338984
Papeng Falls, Mekong River, Sithandone Province, Lao PDR (ANSP 340043)
Papaeng Water Falls, collected one side branch of the fall, Sithandone Province, Lao PDR (ANSP 338972)
Countries occurrence:
Native:
Lao Peoples Democratic Republic
Additional data:
? Estimated area of occupancy (AOO) - km2: 40
? Number of Locations: 3-4
Range Map: Click here to open the map viewer and explore range.
Population [top]
Population: There is no population trend information available for this species.
Current Population Trend: Unknown
Additional data:
? Population severely fragmented: No
Habitat and Ecology [top]
Habitat and Ecology: On and under rocks on bed of river fast-flowing rapids section.
Systems: Freshwater
Threats [top]
Major Threat(s): A potential threat to this species is the Pak Mun dam, 5.5 km west of the confluence of Mekong and Mun Rivers in Ubon Ratchathani province, Thailand. Completed in 1994, it immediately flooded the land around the river. A World Bank report found that 50 fish species out of a total of 265 had completely disappeared, with many others declining. The Mun River upstream of the dam has also been extensively modified (widened and dammed) (Attwood 1995).
Schistosomiasis-transmitting snails (e.g., Neotricula aperta) were predicted to thrive under the new conditions imposed by the dam (Attwood 1995). However, it is unknown how this species would have reacted. It is unlikely that it will have flourished, particularly as the construction project involved modification of its habitat (e.g., removal of bed material, changes in downstream flow) (Vongsombath et al. 2009).
A 30–32 meter high hydroelectric dam is being planned at Don Sahong, on the mainstream of the Mekong River (Baran and Ratner 2007). The project would be less than one kilometre north of the Lao PDR/Cambodia border, and will be constructed at Khone Falls in Champasak Province, southern Lao PDR (Baird 2009). This is the most advanced of eight hydropower projects mooted for the lower Mekong, and will potentially fragment populations of molluscs that inhabit the region, as well as altering water flow patterns downstream. It is also predicted to severely impact the migrations of many species of fish, with unknown ecosystem-level consequences (Baird 2009). The effects on fisheries are also likely to be serious, with the possible result that local people will switch from fish to other protein sources (e.g., molluscs) to supplement their diet.
The Mekong River Commission has agreed that future water quality threats exist, stemming mainly from upstream Chinese catchment areas. Although heavy metal contamination exists around cities, it disappears rapidly downstream. The toxicity of these sediments, however, was not conclusive (MRC 2006). Many large dams interrupt the flow of the Mekong along its length, while upstream mining operation are reported to have seriously perturbed macroinvertebratre species assemblages (Vongsombath et al. 2009). These threats are likely to increase as local human pressure increases.
Conservation Actions [top]
Conservation Actions: There are no species-specific conservation measures in place for this species. Further research is recommended into this species exact distribution, population status, ecology and the possible impact of threats.
Citation: Köhler, F. & Rintelen, T. 2011. Lacunopsis globosa. The IUCN Red List of Threatened Species 2011: e.T188909A8661129. http://dx.doi.org/10.2305/IUCN.UK.2011-2.RLTS.T188909A8661129.en. Downloaded on 03 May 2018.
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