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Ontogeny of energy allocation reveals selective pressure promoting risk-taking behaviour in young fish cohorts

Biro, Peter A., Post, John R. and Abrahams, Mark V. 2005, Ontogeny of energy allocation reveals selective pressure promoting risk-taking behaviour in young fish cohorts, Royal society of London. Proceedings B. Biological sciences, vol. 272, no. 1571, pp. 1443-1448, doi: 10.1098/rspb.2005.3096.

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Title Ontogeny of energy allocation reveals selective pressure promoting risk-taking behaviour in young fish cohorts
Author(s) Biro, Peter A.ORCID iD for Biro, Peter A. orcid.org/0000-0002-3565-240X
Post, John R.
Abrahams, Mark V.
Journal name Royal society of London. Proceedings B. Biological sciences
Volume number 272
Issue number 1571
Start page 1443
End page 1448
Total pages 6
Publisher Royal Society Publishing
Place of publication London, England
Publication date 2005-07-22
ISSN 0962-8452
1471-2954
Keyword(s) behaviour
lipid
predation
starvation
trade-off
Summary Given limited food, prey fishes in a temperate climate must take risks to acquire sufficient reserves for winter and/or to outgrow vulnerability to predation. However, how can we distinguish which selective pressure promotes risk-taking when larger body size is always beneficial? To address this question, we examined patterns of energy allocation in populations of age-0 trout to determine if greater risk-taking corresponds with energy allocation to lipids or to somatic growth. Trout achieved maximum growth rates in all lakes and allocated nearly all of their acquired energy to somatic growth when small in early summer. However, trout in low-food lakes took greater risks to achieve this maximal growth, and therefore incurred high mortality. By late summer, age-0 trout allocated considerable energy to lipids and used previously risky habitats in all lakes. These results indicate that: (i) the size-dependent risk of predation (which is independent of behaviour) promotes risk-taking behaviour of age-0 trout to increase growth and minimize time spent in vulnerable sizes; and (ii) the physiology of energy allocation and behaviour interact to mediate growth/mortality trade-offs for young animals at risk of predation and starvation.
Language eng
DOI 10.1098/rspb.2005.3096
Field of Research 060201 Behavioural Ecology
060801 Animal Behaviour
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2005, The Royal Society
Persistent URL http://hdl.handle.net/10536/DRO/DU:30047907

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