Predators select against high growth rates and risk-taking behaviour in domestic trout populations

Biro, Peter A., Abrahams, Mark V., Post, John R. and Parkinson, Eric A. 2004, Predators select against high growth rates and risk-taking behaviour in domestic trout populations, Royal society of London. Proceedings B. Biological sciences, vol. 271, no. 1554, pp. 2233-2237, doi: 10.1098/rspb.2004.2861.

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Title Predators select against high growth rates and risk-taking behaviour in domestic trout populations
Author(s) Biro, Peter A.ORCID iD for Biro, Peter A.
Abrahams, Mark V.
Post, John R.
Parkinson, Eric A.
Journal name Royal society of London. Proceedings B. Biological sciences
Volume number 271
Issue number 1554
Start page 2233
End page 2237
Total pages 5
Publisher Royal Society Publishing
Place of publication London, England
Publication date 2004-11-07
ISSN 0962-8452
Keyword(s) behaviour
growth-mortality trade-off
Summary Domesticated (farm) salmonid fishes display an increased willingness to accept risk while foraging, and achieve high growth rates not observed in nature. Theory predicts that elevated growth rates in domestic salmonids will result in greater risk–taking to access abundant food, but low survival in the presence of predators. In replicated whole–lake experiments, we observed that domestic trout (selected for high growth rates) took greater risks while foraging and grew faster than a wild strain. However, survival consequences for greater growth rates depended upon the predation environment. Domestic trout experienced greater survival when risk was low, but lower survival when risk was high. This suggests that animals with high intrinsic growth rates are selected against in populations with abundant predators, explaining the absence of such phenotypes in nature. This is, to our knowledge, the first large–scale field experiment to directly test this theory and simultaneously quantify the initial invasibility of domestic salmonid strains that escape into the wild from aquaculture operations, and the ecological conditions affecting their survival.
Language eng
DOI 10.1098/rspb.2004.2861
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 ©2004, The Royal Society
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