IMPORTANCE OF THE RODENTS IN THE DIET OF Tyto alba(SCOPOLI, 1759) IN THE SOUF  REGION (ALGERIA)

Z ALIA; M SEKOUR; M. D. OULD El HADJ

Z ALIA Université KASDI MERBAH Ouargla, Département des Sciences Agronomiques. Faculté des Sciences de la Nature et de la Vie et Sciences de la terre et de l’Univers (Ouargla 30 000 Algérie).
M SEKOUR Université KASDI MERBAH Ouargla. Laboratoire Bio-ressourcesSahariennes : Préservation et Valorisation. Faculté des Sciences de la Nature et de la Vieet Sciences de la terre et de l’Univers (Ouargla 30 000 Algérie).
M. D. OULD El HADJ Université KASDI MERBAH-Ouargla. Laboratoire de protection des écosystèmes en zones arides et semi-aride (Ouargla 3000 Algérie )

Résumé

The study of the diet of a Barn Owl (Tyto alba) in the region of Souf (33 at 34 ° N. and 6 ° at 8 ° E.), by analysis of 60 rejections pellets, allowed to count 150 individuals of rodents preys represented by 13 belonging species, to two families (Muridae and Dipodidae). Muridae is represented by it under family of Murinae (14.7 %) with 4 species and those of the Gerbillinae (82 %) with 8 species. The species the most consummate by the Barn-owl, lives Gerbillus gerbillus(FC = 44 %) and Gerbillus campestris(FC = 13.3 %). The value of diversity of Shannon-Weaver (H’) applied to the species - preys, is equal to 3.15 bits against a value of 2.58 bits only for the rodents. The category of rodents seems much diversified with regard to the other animal categories which are counted in the balls of the Barn-owl. For the value of maximal diversity (H max) is equal to 4.52 bits for all the species of preys, and 3.70 bits for the rodents.