Sites - Important Bird and Biodiversity Areas (IBAs)
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Lake Oursi - Lake Darkoye
Burkina Faso, Oudalan
0o 5.00' West 14o 42.00' North
A3, A4i, A4iii
250 - 300m
Year of IBA assessment
Fondation des Amis de la Nature (NATURAMA)
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.
Key Biodiversity 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.
Non-bird biodiversity: Mammals of global conservation concern include Gazella rufifrons (VU) and Acinonyx jubatus (VU) (continued occurrence requires verification).