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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Distribution, abundance and habitat preferences of White-tailed Swallow Hirundo megaensis and Ethiopian Bush-crow Zavattariornis stresemanni, two southern Ethiopian endemics
Auteurs :	R. J. Mellanby, Auteur ; B. Ross, Auteur ; A. Watt, Auteur ; M. Wondafrash, Auteur ; M. Ewnetu, Auteur ; C. Broadhurst, Auteur ; R. Critchlow, Auteur ; A. Dadesa, Auteur ; T. Deas, Auteur ; C. Enawgaw, Auteur ; B. Gebremedhin, Auteur ; E. Graham, Auteur ; S. Maclean, Auteur ; M. McKean, Auteur ; N. J. Collar, Auteur ; C. N. Spottiswoode, Auteur
Type de document :	Article
Dans :	Bird Conservation International (18(4) DEC 2008)
Article en page(s) :	395-412
Langues:	Anglais
Résumé :	The Yabelo-Mega region of southern Ethiopia's Borana region holds two threatened endemic and restricted-range species, the White-tailed Swallow Hirundo megnensis ('Vulnerable') and Ethiopian Bush-crow Zavattariornis stresemanni ('Endangered'). Concern about these species' conservation Status has recently increased owing to rapid alterations to their thornbush savanna habitat. This six-week field Study aimed to identify the specific habitat requirements of each species, with a view to understanding how they are likely to be affected by these changes, and to provide baseline quantitative abundance data using simple and repeatable methods. White-tailed Swallows were recorded on an overall 4.7% of transects and point counts, and in all habitats (including villages and farmland) except broadleaved Combretum-Terminalia woodland. Line transects indicated that swallows avoided dense scrub and tree cover, but this was not detected during point counts. Bush-crows were recorded on an overall 16.6% of transects and point Counts, and like swallows showed a strong preference for thornbush (Acacia and Commiphora) over broadleaved woodland, avoided dense scrub cover, and were particularly frequent in the vicinity of villages. During point-counts, bush-crows were more frequently encountered inside the nominally protected Yabelo Sanctuary, whereas the reverse was true for White-tailed Swallows. Recent concern about dramatic declines in bush-crow numbers revealed by roadside Count,; may have been exacerbated by habitat alteration along roads alone, but the species remains under threat from habitat transformation through agricultural expansion, tree felling and bush encroachment.

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