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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Density-dependent habitat distribution in birds: issues of scale, habitat definition and habitat availability
Auteurs :	D. E. Chamberlain, Auteur ; R. J. Fuller, Auteur
Type de document :	Article
Dans :	Journal of Avian Biology (30(4) DEC 1999)
Article en page(s) :	427-436
Langues:	Anglais
Résumé :	For many species, distribution across different habitats may be a dynamic process affected by population size and the position of individual habitats on the continuum of habitat quality from most preferred to least preferred. Species that exhibit density-dependent habitat preferences should show a negative relationship between the proportion of a population in a particular habitat and total population size over time in those habitats that are relatively preferred, and positive relationships in habitats that are relatively less preferred. Such relationships were analysed within 13 farmland study areas for 12 bird species. At least one significant relationship was detected per species, but no species showed consistent significant relationships in any habitat across plots. Furthermore, both negative (relatively preferred habitat) and positive (relatively less preferred habitat) relationships were detected in different study areas for a particular species in a given habitat. When habitat variation across study areas was controlled in a combined analysis, only four species showed strong evidence of density-dependent habitat use. The lack of stronger relationships between population size and habitat use is likely to be a consequence of defining habitat at too crude a scale. Density-dependent habitat processes may be more usefully examined when specific micro-habitat features that contribute to territory quality can be identified. Inability to detect consistent patterns of habitat preference may be caused by spatial variation in habitat availability, habitat quality and inter-specific competition.

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