Biologie de la reproduction de l’Érismature à tête blanche Oxyura leucocephala au lac Tonga (Algérie)

Breeding biology of the White-headed Duck Oxyura leucocephala at Lake Tonga (Algeria). The study of the reproductive phenology of the White-headed Duck was carried out at Lake Tonga, a wetland of international importance for the nesting of this species across the Mediterranean basin. The following breeding parameters have been studied in 2007 and 2008 : dates of laying and hatching, clutch size and breeding success. The breeding population was estimated at 78 males and 26 females in 2007 and at 71 males and 22 females in 2008. Laying is recorded during a period of 9 to 11 weeks from late April to mid-July. A brood size of 3.2 ± 1.6 young (n = 17) was recorded in the first year of study and another of 3.9 ± 1.4 young (n = 37) in the second one. Young fledged between late June and early September. The data obtained in this study suggest that the White-headed Duck may be considered as a bird almost constant in terms of life-history traits in Algeria.