From individuals to populations : prey fish risk-taking mediates mortality in whole-system experiments

Biro, Peter A., Post, John R. and Parkinson, Eric A. 2003, From individuals to populations : prey fish risk-taking mediates mortality in whole-system experiments, Ecology, vol. 84, no. 9, pp. 2419-2431, doi: 10.1890/02-0416.

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Title From individuals to populations : prey fish risk-taking mediates mortality in whole-system experiments
Author(s) Biro, Peter A.ORCID iD for Biro, Peter A.
Post, John R.
Parkinson, Eric A.
Journal name Ecology
Volume number 84
Issue number 9
Start page 2419
End page 2431
Total pages 13
Publisher Ecological Society of America
Place of publication Ithaca, N.Y.
Publication date 2003-09
ISSN 0012-9658
Keyword(s) activity
antipredator behavior
habitat use
oncorhynchus mykiss
population consequences
rainbow trout
Summary Recent research suggests that the behavior of individuals under risk of predation could be a key link between individual behavior and population and community dynamics. Yet existing theory remains largely untested at large spatial and temporal scales. We manipulated food available to age-0 rainbow trout while at risk of cannibalism, in a replicated factorial whole-lake experiment, to test whether the trade-off between growth and mortality rates is mediated by foraging activity by young fish under predation risk. We found that this trade-off exists for young fish at the whole-system scale, and that food-dependent behavioral variation has large mortality consequences. In high-food lakes, age-0 trout spent less time moving, fewer individuals swam continuously, and those swimming continuously swam at slower speeds relative to those in low-food lakes. Age-0 trout also used deep, risky habitats less when food was abundant. This lower activity, combined with avoidance of risky habitats, coincided with 68% higher survival in high-food lakes. If general, this trade-off may be a key mechanism linking individual behavior to population-level processes in size-structured populations.
Language eng
DOI 10.1890/02-0416
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 ©2003, Ecological Society of America
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