Document Detail

Ontogeny of energy allocation reveals selective pressure promoting risk-taking behaviour in young fish cohorts.
MedLine Citation:
PMID:  16011918     Owner:  NLM     Status:  MEDLINE    
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.
Peter A Biro; John R Post; Mark V Abrahams
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Proceedings. Biological sciences / The Royal Society     Volume:  272     ISSN:  0962-8452     ISO Abbreviation:  Proc. Biol. Sci.     Publication Date:  2005 Jul 
Date Detail:
Created Date:  2005-07-13     Completed Date:  2005-10-04     Revised Date:  2013-06-09    
Medline Journal Info:
Nlm Unique ID:  101245157     Medline TA:  Proc Biol Sci     Country:  England    
Other Details:
Languages:  eng     Pagination:  1443-8     Citation Subset:  IM    
Division of Ecology, Department of Biological Sciences, University of Calgary, 2500 University Drive, NW Calgary, Alberta, Canada T2N 1N4.
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MeSH Terms
Analysis of Variance
Body Weights and Measures
Energy Metabolism / physiology*
Fresh Water
Likelihood Functions
Lipid Metabolism
Population Density
Selection, Genetic*
Trout / growth & development*

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