RÉPARTITION ET ABONDANCE DE L'ÉRISMATURE À TÊTE BLANCHE Oxyura leucocephala DANS LES ZONES HUMIDES DU NORD-EST ALGÉRIEN
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Date
2016
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Publisher
A lauda
Abstract
The globally threatened
White-headed Duck is one the most rare duck
species in the Western Palearctic. Its distribution in
Algeria is mainly restricted to the northeastern part
of the country and the Hauts-Plateaux. In 2013 and
2014, 694 individuals were counted. The studied
sites harboured distinct numbers in winter and in
summer of the two years. The p-values (KRUSKALWALLIS
test) were lower than 0.05. The Lake Tonga
showed the highest numbers in winter and the
Boussedra wetland in summer. The results indicated
a stable occurrence in the studied areas without
any difference between the two years. The PCA
analysis showed a significant correlation between
the distribution of this species and three following
main factors: vegetation, surface area and water
depth at the Boussedra wetland, Lake Tonga and
Garaet Hadj-Taher. The lower occurrence in other
parts of the studied areas, particularly on the HautsPlateaux,
is mainly the consequence of drying out
process and habitat degradation.