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The bird community of the afro-alpine zone in the Bale mountains Ethiopia Le peuplement doiseaux de letage afro-alpin du massif du Bale Ethiopie


, : The bird community of the afro-alpine zone in the Bale mountains Ethiopia Le peuplement doiseaux de letage afro-alpin du massif du Bale Ethiopie. Alauda, 634: 281-290

The breeding birds at the afro-alpine level of the Bale mountains (Ethiopia), contain 48 species of which 35 are sedentary, 8 are endemic and 3 are of palearctic origin. Dominating this avifauna are the guilds of predators and scavengers (10 species) and the great omnivore-insectivores (8 species). During the dry season 23 palearctic migrants have been observed of which: 13 species are associated with water (8 large omnivore-insectivores, 5 swimming vegetarians) and 7 are predators. With the attitudinal elevation (which varies between 3500 m and 4000 m between the 2 sectors sampled), the richness of the avifauna during the rainy season diminishes by 17 species, an impoverishment which touches mainly the passerines, all belonging to african species, despite the fact that the endemic species and those of palearctic origin are maintained. The average punctual richness and the average punctual abundance of the community of small passerines decrease, whereas the proportion of species of high frequency occurrence increases. Comparison with other mountain ranges shows the originality of this supra-forestal population in respect to the ecological and biogeographical aspects and underlines the importance of the predators and the relative small numbers of passerines.

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