Predators, food and social context shape the types of vigilance exhibited by kangaroos

Favreau, Francois-Rene, Pays, Olivier, Fritz, Herve, Goulard, Michel, Best, Emily C. and Goldizen, Anne W. (2015) Predators, food and social context shape the types of vigilance exhibited by kangaroos. Animal Behaviour, 99 109-121. doi:10.1016/j.anbehav.2014.11.001


Author Favreau, Francois-Rene
Pays, Olivier
Fritz, Herve
Goulard, Michel
Best, Emily C.
Goldizen, Anne W.
Title Predators, food and social context shape the types of vigilance exhibited by kangaroos
Journal name Animal Behaviour   Check publisher's open access policy
ISSN 0003-3472
1095-8282
Publication date 2015-01-01
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.anbehav.2014.11.001
Open Access Status Not Open Access
Volume 99
Start page 109
End page 121
Total pages 13
Place of publication London, United Kingdom
Publisher Academic Press
Language eng
Abstract Vigilance in prey species can serve many purposes, including predator detection and monitoring other group members, and is generally thought to impose a cost due to reduced food intake. However, previous studies have shown that herbivores are able to reduce the foraging cost of vigilance by chewing their food during vigilance bouts ('vigilance with chewing', as compared to 'vigilance without chewing'). How predation risk, food availability and competition affect both the functions and the foraging costs of vigilance remains an open question. We studied female eastern grey kangaroos, Macropus giganteus, during winter and summer, when available food supplies were poor and rich, respectively, to investigate how group size, distance to cover, proximity between foragers and food patch quality affected decisions of foraging female kangaroos to exhibit antipredator or social vigilance, distinguishing vigilance with and without chewing. The use of antipredator vigilance was mainly driven by the perception of predation risk, and antipredator vigilance without chewing decreased with increased group size whereas antipredator vigilance with chewing increased nonlinearly with group size in winter. Distance to cover affected both forms of antipredator vigilance in summer only but there was no effect of nearest-neighbour distance. Social vigilance was affected positively by group size, and distance between foragers affected social vigilance without chewing positively, particularly in winter, and social vigilance with chewing negatively. Finally, patch quality increased the use of social vigilance with chewing in both seasons and decreased the use of antipredator vigilance with chewing in winter. This study provides new information on how animals make decisions about the functions and foraging costs of vigilance and allows a better understanding of how social foragers respond to an ever-changing environment.
Keyword Antipredator vigilance
Competition
Macropus giganteus
Patch quality
Predation risk
Social vigilance
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
School of Biological Sciences Publications
 
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