Journal ArticleDOI
Vigilance Behaviour in Grazing African Antelopes
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TLDR
Time spent looking varied with position within the group; this effect was strongest in closed habitats, where central animals tended to scan least and feed most, and within species, animals inclosed habitats, those with dense vegetation, tended to spend more time in looking than did animals in the open.Abstract:
African antelope may devote a large proportion of their foraging time to looking around. The factors affecting such vigilance behaviour are examined for grazing antelope, five species being studied in detail. The proportion of time spent looking decreased as species body weight increased. Within species, animals in closed habitats, those with dense vegetation, tended to spend more time in looking than did animals in the open. There was some evidence that vigilance, presumably for predators, was shared by group members, but in one species, impala, vigilance apparently increased with group size and with proximity to neighbours. Time spent looking varied with position within the group; this effect was strongest in closed habitats, where central animals tended to scan least and feed most. Vigilance increased as feeding success decreased, partly due to mutual interference between looking and feeding. The possible social, foraging and predator-detection values of vigilance are discussed. A simple model is introduced to help explain the effects of cover and to facilitate further discussion.read more
Citations
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Journal ArticleDOI
Shrub cover homogenizes small mammals' activity and perceived predation risk
Anne A. Loggins,Adrian M. Shrader,Ara Monadjem,Ara Monadjem,Robert A. McCleery,Robert A. McCleery +5 more
TL;DR: These findings suggest that areas of minimal or extensive shrub cover (shrub encroachment) may be homogenizing rodents’ perceptions of predation risk and thus shaping their use of space.
Journal ArticleDOI
Thirteen-lined ground squirrel (Sciuridae: Spermophilus tridecemlineatus) antipredator vigilance decreases as vigilance cost increases.
Cody L. Arenz,Daniel W. Leger +1 more
TL;DR: The hypothesis that a decrease in ground squirrel antipredator vigilance would benefit the squirrels by decreasing their time exposed to predators (i.e. decreased trial duration), was not supported.
Journal ArticleDOI
On the dynamics of predation risk perception for a vigilant forager
Etienne Sirot,Olivier Pays +1 more
TL;DR: This study uses an analytical model to compute optimal vigilance strategies, taking into account the trade-off between feeding and limiting exposure to predators, and predicts that a forager will scan more often, and for longer periods, when the likelihood of a predator's presence in the surrounding environment is increased.
Flexibilité de l'organisation sociale du chevreuil en fonction des caractéristiques de l'environnement
TL;DR: In this paper, an organisation sociale d'une population de chevreuils vivant dans un milieu ouvert (Plateau Picard) en comparaison avec une population forestiere, dans le but de recherchercher les differences de strategie d'exploitation du milieu and de cerner le degre de flexibilite sociale de l'espace.
Journal ArticleDOI
Relationship between Distance to Cover, Vigilance and Group Size in Staging Flocks of Semipalmated Sandpipers
TL;DR: Controlling for food density, forager density and phenotypic attributes often correlated with distance to cover, it was found that as distance to obstructive cover increased, sandpipers foraged in sparser groups, were less flighty and to some extent less vigilant.
References
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Book
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TL;DR: This chapter discusses hunting for Prey, the Diversity of Hunting Methods, and the Motivation Underlying Feeding Responses of Predator-Prey Interactions.
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