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
Sex differences in giraffe foraging behavior at two spatial scales.
TL;DR: Overall the results agree qualitatively with the body-size hypothesis, where sex-related differences in foraging behavior led to greater estimated intake rates for males at the within-patch and within-habitat scales.
Journal ArticleDOI
Pulse-Driven Loss of Top-Down Control: The Critical-Rate Hypothesis
TL;DR: In this paper, the authors show that escape from herbivores is a mechanism that can play a role in several state shifts of this kind, and they show that this mechanism can lead to a situation where a brief resource pulse for plants may invoke a persistent shift to a high biomass state whereas gradual enrichment to the same resource level is insufficient to allow such a change.
Journal ArticleDOI
Foraging dynamics in goose flocks : the cost of living on the edge
TL;DR: The effects of flock position on the foraging performance of individual barnacle geese, Branta leucopsis, were determined by comparing foraging behavior, vegetation quality and diet of geese at the edge and centre of feeding flocks as mentioned in this paper.
Journal ArticleDOI
Vigilance as a measure of fear in dairy cattle
TL;DR: This article found that cows alter their vigilance according to their degree of fearfulness toward people and toward different environments, and that measures of vigilance may provide information on the degree of concern of the animals.
Journal ArticleDOI
Vigilance in African Mammals: Differences Among Mothers, Other Females, and Males
Joanna Burger,Michael Gochfeld +1 more
TL;DR: It is suggested that in 1993 herd size was above a threshold where increases in group size can lead to further decreases in vigilance, and animals on the edge of herds devoted more time to vigilance than intermediate or central animals.
References
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Journal ArticleDOI
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Journal ArticleDOI
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Journal ArticleDOI
The Social Organisation of Antelope in Relation To Their Ecology
TL;DR: The paper describes different feeding styles among antelope, in terms of selection of food items and coverage of home ranges, and argues that these feeding styles bear a relationship to maximum group size of feeding animals through the influence of dispersion ofFood items upon group cohesion.
Book
The Ethology of Predation
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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