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
Risk of predation makes foragers less choosy about their food
TL;DR: The results show that when foraging under the risk of predation, H. affinis individuals significantly reduce their level of choosiness for seeds, and suggest that considering the amount of items consumed, alone, would be a misleading metric when assessing individual response to a risk ofpredation.
Journal Article
Factors affecting the vigilance and flight behaviour of impalas
TL;DR: This paper investigated the influences of various natural and anthropogenic factors on the vigilance and flight behaviour of impalas in the Save Valley Conservancy, Zimbabwe, using multivariate statistical techniques.
Journal ArticleDOI
Drosophila melanogaster behaviour changes in different social environments based on group size and density
TL;DR: It is shown that Drosophila melanogaster flies can detect the number of individuals around them and modify their behaviour based on group size and density, and that LUSH-expressing cells are necessary for group size detection, suggesting the importance of olfactory support cells in modulating collective social behaviours.
Journal ArticleDOI
The spatial distribution of flocking foragers: disentangling the effects of food availability, interference and conspecific attraction by means of spatial autoregressive modeling
TL;DR: A classical functional response model based on resource availability and interference with a conspecific attraction model is integrated and used to simulate spatial distributions of animals in their continuous resource landscapes and it is shown that the integrated model produces distributions of foraging animals that closely match the distributions observed in nature.
Journal ArticleDOI
Visibility and vigilance: behavior and population ecology of uinta ground squirrels (spermophilus armatus) in different habitats
TL;DR: Ground squirrels, specifically, appear to be capable of adapting to variation in the structure of the vegetation and will likely thrive as long as an abundance of grasses are available to provide fattening seeds for forage.
References
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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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