La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Predators at bird nests in a northern hardwood forest in New Hampshire
Auteurs :	David I. King, Auteur ; Richard M. DeGraaf, Auteur
Type de document :	Article
Dans :	Journal of Field Ornithology (77(3) SUM 2006)
Article en page(s) :	239-243
Langues:	Anglais
Résumé :	Nest predation is the primary cause of nest failure in most passerine birds, and increases in nest predation associated with anthropogenic habitat disturbance are invoked as explanations for population declines of some bird species. In most cases, however, the identity of the nest predators is not known with certainty. We monitored active bird nests with infrared time-lapse video cameras to determine which nest predators were responsible for depreciating bird nests in northern New Hampshire. We monitored 64 nests of I I bird species during three breeding seasons, and identified seven species of predators during 14 predation events. In addition, we recorded two instances of birds defending nests from predators and, in both cases, these nests were ultimately lost to predation. These results contrast with other studies in terms of the relatively high proportion of nests depreciated by raptors and mice, as well as the absence of any predation by snakes. The diverse suite of predators in this and other studies is likely to confound our understanding of patterns of nest predation relative to fragmentation and habitat structure.

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