Individual variation in vigilance in female eastern grey kangaroos

Dannock, R. J., Blomberg, S. P. and Goldizen, A. W. (2013) Individual variation in vigilance in female eastern grey kangaroos. Australian Journal of Zoology, 61 4: 312-319. doi:10.1071/ZO12122

Author Dannock, R. J.
Blomberg, S. P.
Goldizen, A. W.
Title Individual variation in vigilance in female eastern grey kangaroos
Journal name Australian Journal of Zoology   Check publisher's open access policy
ISSN 0004-959X
Publication date 2013-01-01
Year available 2013
Sub-type Article (original research)
DOI 10.1071/ZO12122
Open Access Status Not yet assessed
Volume 61
Issue 4
Start page 312
End page 319
Total pages 8
Place of publication Collingwood, VIC Australia
Publisher C S I R O Publishing
Language eng
Subject 0602 Ecology
0608 Zoology
Abstract For herbivores, vigilance usually involves a trade-off with foraging, and a further trade-off between antipredator and social vigilance. Thus individual variation in vigilance may result in significant fitness consequences. We used mixed-effects models to document individual variation in vigilance in wild adult female eastern grey kangaroos (Macropus giganteus) in Queensland, Australia. We tested the effects of group size, presence of adult males and wind on vigilance patterns and variation by analysing 399 five-minute samples on 31 individually identified females who were foraging on the periphery of groups. We determined the proportion of time that individuals spent vigilant, and the proportions of vigilance time spent in social versus antipredator vigilance and in low-versus high-intensity vigilance postures. The proportion of time females spent vigilant decreased with increasing group size but was not affected by wind speed or male presence, while the amount of their vigilance time spent in social vigilance was affected by interactions among the variables. After controlling for these effects, 13 females' vigilance patterns were significantly different from the population mean. Individual variation was also found in vigilance postures used and the effect of male presence. Understanding individual variation in vigilance is important for understanding individuals' antipredator and social strategies.
Keyword Antipredator Behaviour
Behavioural variation
Group size effect
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 2014 Collection
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