|Central coordinates||16o 26.00' West 16o 34.00' North|
|IBA criteria||A1, A4i, A4iii|
|Altitude||2 - 6m|
|Year of IBA assessment||2001|
Site description Chott Boul is a coastal wetland formed by an ancient mouth of the Senegal river, now isolated from it and with only temporary connections to the sea (behind a 10-km strip of coastal dunes). It lies 175 km south of Nouakchott and 70 km west of Rosso. The total area is approximately 15,500 ha, of which 7,000 ha is a marine zone of mudflats, intertidal saltmarsh, fresh water and brackish zones. The terrestrial zone is made up of 8,500 ha of wetland, floodable plains with temporary and permanent swamps, lakes and marshes of brackish to hyper-saline water. Fresh water enters the system between September and November from Hassi Baba swamp, part of the Diawling-Tichillit system within Diawling National Park (site MR021). Thus, the southern edge of Chott Boul is contiguous with Diawling while Aftout-Es-Saheli (MR012) lies immediately to the north and is fed by a swamp connecting the Grand Lac at Chott Boul with the southern flood-plain of the Aftout.Other than for this swamp, Chott Boul is limited to the north by mobile and stable dunes and to the east by a flood-plain and rice-fields. The dunes to the north are covered by Euphorbia balsamifera and Tamarix senegalensis. The northern part of the site is an unvegetated, flat saltpan, which may once have been an area of mangroves. The south is characterized by halophytic vegetation, the remnants of flood-plain forests (Acacia nilotica, Tamarix senegalensis) and grasslands (Sporobolus robustus, Vetiveria nigritana and Juncus rigidus).
Key Biodiversity See Box for key species. In addition, Chott Boul is one of the only sites where Podiceps nigricollis overwinters in the area; 180 were recorded in December 1998. Counts of other species include 4,000 Larus fuscus in 2001. Chott Boul and the southern parts of Aftout es Saheli hold only known nesting colony of Phoenicopterus minor in West Africa (see site MR012).
Non-bird biodiversity: The canids Fennecus zerda (DD) and Vulpes pallida (DD) occur, as does the nationally vulnerable Varanus griseus.
|Species||Season||Period||Population estimate||Quality of estimate||IBA Criteria||IUCN Category|
|Northern Shoveler Spatula clypeata||winter||2001||4,590 individuals||-||A4i||Least Concern|
|Greater Flamingo Phoenicopterus roseus||winter||2001||1,543 individuals||-||A4i||Least Concern|
|Lesser Flamingo Phoeniconaias minor||resident||-||present||-||A1||Near Threatened|
|Pied Avocet Recurvirostra avosetta||winter||2001||5,650 individuals||-||A4i||Least Concern|
|Black-tailed Godwit Limosa limosa||winter||2001||7,900 individuals||-||A4i||Near Threatened|
|Slender-billed Gull Larus genei||winter||2001||800 individuals||-||A4i||Least Concern|
|Caspian Tern Hydroprogne caspia||winter||2000||986 individuals||-||A4i||Least Concern|
|A4iii Species group - waterbirds||winter||2001||20,000 individuals||unknown||A4iii|
|2001||high||not assessed||not assessed|
|Good - based on reliable and complete / representative data|
|Biological resource use||fishing & harvesting aquatic resources - unintentional effects: large scale||likely in short term (within 4 years)||majority/most of area/population (50-90%)||moderate to rapid deterioration||high|
|Biological resource use||hunting & collecting terrestrial animals - intentional use (species being assessed is the target)||happening now||some of area/population (10-49%)||slow but significant deterioration||medium|
|Pollution||agricultural & forestry effluents - herbicides and pesticides||happening now||majority/most of area/population (50-90%)||slow but significant deterioration||high|
|Pollution||agricultural & forestry effluents - nutrient loads||happening now||majority/most of area/population (50-90%)||moderate to rapid deterioration||high|
|Pollution||domestic & urban waste water - type unknown/unrecorded||happening now||some of area/population (10-49%)||slow but significant deterioration||medium|
|Residential and commercial development||commercial and industrial development||happening now||some of area/population (10-49%)||moderate to rapid deterioration||high|
|Protected area||Designation||Area (ha)||Relationship with IBA||Overlap with IBA (ha)|
|Chat Tboul||Wetlands of International Importance (Ramsar)||15,500||is identical to site||15,500|
|IUCN habitat||Habitat detail||Extent (% of site)|
|Artificial - terrestrial||9%|
|Land-use||Extent (% of site)|
|nature conservation and research||-|
|Notes: Local salt collection.|
References De Naurois (1969), Hamerlynck and ould Samba (1995), IUCN (1999), Measson (2001).
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Recommended citation BirdLife International (2015) Important Bird and Biodiversity Area factsheet: Chott Boul. Downloaded from http://www.birdlife.org on 29/11/2015
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