La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Effects of nest visits on predator activity and predation rate in a Greater Snow Goose colony
Auteurs :	J. Bety, Auteur ; G. Gauthier, Auteur
Type de document :	Article
Dans :	Journal of Field Ornithology (72(4) FAL 2001)
Article en page(s) :	573-586
Langues:	Anglais
Résumé :	We assessed the effect of nest visits by researchers oil the activity of nest predators and predation rate of eggs in a High Arctic Greater Snow Goose (Chen caerulescens atlantica) colony. The study was conducted in years of moderate (1996) and low (1997) overall nest predation rate, We first compared activity late (number of presences per It) and behavior of nest predators in the colony with and without investigator disturbance. In one year out of two, activity rate and time spent in the colony were higher during nest visits than under undisturbed conditions for Glaucous Gulls (Larus hyperboreus) and Parasitic Jaegers (Stercorarius parasiticus). Moreover, presence of investigators significantly increased (4.8 times) the probability of nest attack by predators in one Year. Nevertheless, the immediate revisit technique showed that the percentage of goose eggs robbed by predators in monitored nests was low (

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