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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Cohabitation and nest-site selection of Common Swift (Apus apus) and Pallid Swift (A. pallidus).
Auteurs :	Anton Antonov, Auteur ; Dimitrinka Atanasova, Auteur
Type de document :	Article
Dans :	Vogelwarte (41(4) Dezember 2002)
Article en page(s) :	231-239
Langues:	Allemand
Résumé :	This study explored colony pattern, interspecific association and nest-site selection of two closely related species of swift. Common Swift (Apus apus) and Pallid Swift (A. pallidus) in Sofia city, Bulgaria. The numbers and locations of nests were determined by the newly devised method of "excrement watching" but also supplemented with the classic "building mapping" method. The Common Swift population (1147 pairs) was nearly 4 times larger than the Pallid Swift population (304 pairs). Common Swift colonies were of a wider range of sizes (3-34 pairs vs. 3-11 in Pallid Swift), but in both species small colonies predominated. Most pairs of both species bred in monospecific colonies, but a greater proportion of the Pallid Swift population nested in mixed colonies. In both species nest-site selection took place with preference for north and east facing situations. Most pairs in both species nested in the eaves of buildings but Pallid Swift was less specific in its choice of nest-sites, utilizing a wider range of heights, and occupying the whole range of recorded nest-cavity types. Pallid Swift was suggested to have colonized the city after Common Swift and initially associated more strongly with the latter.

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