|Location||Burkina Faso, Oudalan|
|Central coordinates||0o 5.00' West 14o 42.00' North|
|IBA criteria||A3, A4i, A4iii|
|Altitude||250 - 300m|
|Year of IBA assessment||2001|
Ornithological information See Box and Table 2 for key species. Large numbers of Palearctic migrants use the lakes annually. At Oursi and Yomboli, 106 species of waterbird have so far been recorded (47 Palearctic and 59 Afrotropical). In 1998 counts for Lake Oursi alone totalled 20,000. The continued presence of Struthio camelus is reported by poachers.
Site description This site consists of seven seasonal lakes, the largest of which are Oursi and Darkoye, in the Réserve Partielle du Sahel, north of the town of Gorom-Gorom. The westernmost, Tin Edia, is located at the foot of hills, Oursi, the largest, is at the base of old sand-dunes, while the others, Darkoye, Kouyéra, Yomboli, Kissi and Bangao, occur in open steppe, to the west of the town of Markoye. Also included is the habitat between the lakes which includes sand-dunes (such as at Oursi), semi-desert grasslands, open eroded shields, drainage lines, inselbergs rising out of the plains and a series of hills. Depending entirely upon the annual run-off from the rains of July to September, lake levels vary considerably from year to year. Some lakes are ringed by important stands of trees such as Acacia albida and Ficus sp. On the seasonal flood-plains there is a rich plant community, including Aeschynomene lotus and the sedges and grasses Cyperus alopecuroides, Echinochloa stagnina, E. pyramidalis and Oryza longistaminata, providing important dry season grazing.
|Species||Season||Period||Population estimate||Quality of estimate||IBA Criteria||IUCN Category|
|Little Grebe Tachybaptus ruficollis||winter||-||500 individuals||medium||A4i||Least Concern|
|Purple Swamphen Porphyrio porphyrio||winter||-||647 individuals||-||A4i||Least Concern|
|Black-winged Stilt Himantopus himantopus||winter||-||1,713 individuals||-||A4i||Least Concern|
|African Collared-dove Streptopelia roseogrisea||resident||1998||present [units unknown]||-||A3||Least Concern|
|Cricket Longtail Spiloptila clamans||resident||1998||present [units unknown]||-||A3||Least Concern|
|Chestnut-bellied Starling Lamprotornis pulcher||resident||1998||present [units unknown]||-||A3||Least Concern|
|Black Scrub-robin Cercotrichas podobe||resident||1998||present [units unknown]||-||A3||Least Concern|
|Sudan Golden Sparrow Passer luteus||resident||1998||present [units unknown]||-||A3||Least Concern|
|A4iii Species group - waterbirds||winter||-||20,000 individuals||unknown||A4iii|
|Protected area||Designation||Area (ha)||Relationship with IBA||Overlap with IBA (ha)|
|La Mare d'Oursi||Wetlands of International Importance (Ramsar)||45,000||is identical to site||45,000|
|Sahel||Partial Faunal Reserve||1,600,000||protected area contains site||45,000|
Local conservation groups The local conservation group below is working to support conservation at this IBA.
|Oursi Site Support Group||1998|
|IUCN habitat||Habitat detail||Extent (% of site)|
|Artificial landscapes (terrestrial)||5%|
|Wetlands (inland)||Freshwater lakes and pools||minor|
|Land-use||Extent (% of site)|
|nature conservation and research||-|
|Notes: Firewood collection.|
|Notes: Information added by Georges Oueda based on experience May 2008|
Other biodiversity Mammals of global conservation concern include Gazella rufifrons (VU) and Acinonyx jubatus (VU) (continued occurrence requires verification).
Management considerations The area lies within the Réserve Partielle du Sahel and Lake Oursi is a Ramsar Site, at which hunting has been banned (a ban largely respected by legal sport hunters) since the 1970s. Currently this IBA, along with the Béli river (IBA BF001), is the most threatened in the country due to the increasing human pressures around most of the lakes in the complex. Activities include vegetable gardening, the harvesting of Nymphaea, hunting, uncontrolled fishing, cutting of firewood and livestock-grazing. Additionally, the lack of viable management planning or action in the field, the shortage of Direction Général des Eaux et Forêts staff (two only for the whole region) and difficulties in establishing the boundaries of the conservation area, hinder effective conservation. The government is, however, establishing a management system for the Lake Oursi area while the forthcoming PRONAGEN will include the site.
Related state of the world's birds case studies
References MEE (1997), Weessie (1996).
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Recommended citation BirdLife International (2013) Important Bird Areas factsheet: Lake Oursi - Lake Darkoye. Downloaded from http://www.birdlife.org on 21/05/2013
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