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Title: Sentinel dwarf mongooses, Helogale parvula, exhibit flexible decision making in relation to predation risk
Contributor(s): Kern, Julie M  (author); Radford, Andrew N (author)
Publication Date: 2014-12
Early Online Version: 2014-11-13
Open Access: Yes
DOI: 10.1016/j.anbehav.2014.10.012
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Abstract: To maximize survival, animals should adjust their behaviour flexibly in response to indicators of predation risk. Predation risk is affected by a range of ecological, social and individual variables, which can fluctuate over different timescales. In general, current risk levels are known to influence the behaviour of sentinels, individuals that adopt a raised position to scan for danger while groupmates are engaged in other activities. However, there has been little consideration of whether decisions made at different stages of a sentinel bout are affected in the same way by perceived predation risk and whether the same level of behavioural plasticity is exhibited when making these different decisions. Here we used detailed behavioural observations and a playback experiment to investigate the behavioural choices of dwarf mongoose sentinels at three different stages of a bout (before, start, during). Individuals were more likely to begin a bout, and did so sooner, following alarm calls, which are immediate, direct indicators of elevated risk. Sentinels selected an initial height from which to guard depending on factors that tended to vary in the medium term (hours), choosing higher positions in denser habitat and less windy conditions. In contrast, decisions about bout duration were made in relation to short-term (seconds/minutes) changes in information, with sentinels guarding for longer when an alarm call was given during a bout, and terminating bouts sooner when groupmates moved out of sight. Our results demonstrate that sentinel decisions are influenced by both direct and indirect indicators of likely predation risk and that sentinel behaviour is adjusted flexibly with regard to information presented on various timescales, highlighting the complexity of decision-making processes.
Publication Type: Journal Article
Source of Publication: Animal Behaviour, v.98, p. 185-192
Publisher: Elsevier Ltd
Place of Publication: United Kingdom
ISSN: 1095-8282
Fields of Research (FoR) 2008: 060801 Animal Behaviour
060201 Behavioural Ecology
Fields of Research (FoR) 2020: 310901 Animal behaviour
310301 Behavioural ecology
Socio-Economic Objective (SEO) 2008: 970106 Expanding Knowledge in the Biological Sciences
Socio-Economic Objective (SEO) 2020: 280102 Expanding knowledge in the biological sciences
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
Appears in Collections:Journal Article
School of Environmental and Rural Science

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