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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Factors affecting vigilance in Greater White-fronted Geese Anser albifrons
Auteurs :	T. Shimada, Auteur ; K. Shimada, Auteur
Type de document :	Article
Dans :	Wildfowl (54 2003)
Article en page(s) :	203-210
Langues:	Anglais
Résumé :	To maximise nutrient intake, an individual may have to trade time spent feeding against time spent being vigilant for predators. Flock formation is one strategy in which individuals can benefit from the vigilance of other flock members to reduce their own level of investment in vigilance. Several authors have reported that vigilance investment by an individual within a flock differs according to social class and location for Branta spp. geese. Factors affecting vigilance were examined in an Anser sp. goose, the Greater White-fronted Goose A. albifrons, in relation to social class and location (edge and centre) in flocks observed in rice fields around Lake Izunuma-Uchinuma, northern Japan. The geese on the edge spent significantly more time than those in the centre on being vigilant. The percentage of juveniles on the edge of the flock was significantly higher than that in the centre. Among families on the edge, there were significant differences among social classes in adults' vigilance and feeding; the vigilance of parents increased with the number of offspring, and parents with three offspring were the most vigilant. Conversely, the proportion of adults feeding significantly decreased with the number of offspring. Juveniles devote most time to feeding in any social class. Parents make a trade-off between vigilance and feeding in relation to the number of their offspring.

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