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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Does high population density affect reproductive output? Evidence from semicolonial Kestrels Falco tinnunculus
Auteurs :	Luca Salvati, Auteur
Type de document :	Article
Dans :	Vogelwelt (Die) (122(1) 2001)
Article en page(s) :	41-45
Résumé :	I analysed density-dependent effects in the breeding success of a Mediterranean urban population of the Eurasian Kestrel Falco tinnunculus in Rome, central Italy, in a 4-year study. The breeding success showed a remarkable stability over time, if compared with northern populations of Kestrels. The extremely high abundance of scaffolding holes in Rome, creating a superabundance of available nest sites, enhanced the breeding density of Kestrels which reached very high values. Reproductive success was low at high population levels, considerably increasing at low population levels, while the number of failed pairs was negligible at both high and low breeding densities. Nest spacing showed a positive relationship with the mean number of fledglings per breeding pair. Nest distribution did not affect reproductive success. The standard deviation of the mean number of fledglings per breeding pair was extremely stable for changing breeding density over time at high population levels, while it showed a wider variation at low population levels. A classical explanation of the density-dependence of breeding success suggests that hunting territories will presumably overlap considerably at high population levels, and neighbour pairs could thereby reduce the food resources of others, especially when much food is needed for chick rearing.

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