Predators select against high growth rates and risk-taking behaviour in domestic trout populations.
Identifieur interne : 002B66 ( Main/Exploration ); précédent : 002B65; suivant : 002B67Predators select against high growth rates and risk-taking behaviour in domestic trout populations.
Auteurs : Peter A. Biro [Canada] ; Mark V. Abrahams ; John R. Post ; Eric A. ParkinsonSource :
- Proceedings. Biological sciences [ 0962-8452 ] ; 2004.
English descriptors
- KwdEn :
- MESH :
- geographic : British Columbia.
- growth & development : Animals, Domestic, Oncorhynchus mykiss.
- physiology : Animals, Domestic, Feeding Behavior, Oncorhynchus mykiss.
- Animals, Environment, Linear Models, Population Dynamics, Predatory Behavior, Risk-Taking.
Abstract
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.
DOI: 10.1098/rspb.2004.2861
PubMed: 15539348
Affiliations:
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Le document en format XML
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Abrahams</name></author><author><name sortKey="Post, John R" sort="Post, John R" uniqKey="Post J" first="John R" last="Post">John R. Post</name></author><author><name sortKey="Parkinson, Eric A" sort="Parkinson, Eric A" uniqKey="Parkinson E" first="Eric A" last="Parkinson">Eric A. 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Biro</name><affiliation wicri:level="4"><nlm:affiliation>Department of Zoology, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada.</nlm:affiliation><country xml:lang="fr">Canada</country><wicri:regionArea>Department of Zoology, University of Manitoba, Winnipeg, Manitoba R3T 2N2</wicri:regionArea><orgName type="university">Université du Manitoba</orgName><placeName><settlement type="city">Winnipeg</settlement><region type="state">Manitoba</region></placeName></affiliation></author><author><name sortKey="Abrahams, Mark V" sort="Abrahams, Mark V" uniqKey="Abrahams M" first="Mark V" last="Abrahams">Mark V. Abrahams</name></author><author><name sortKey="Post, John R" sort="Post, John R" uniqKey="Post J" first="John R" last="Post">John R. Post</name></author><author><name sortKey="Parkinson, Eric A" sort="Parkinson, Eric A" uniqKey="Parkinson E" first="Eric A" last="Parkinson">Eric A. Parkinson</name></author></analytic><series><title level="j">Proceedings. Biological sciences</title><idno type="ISSN">0962-8452</idno><imprint><date when="2004" type="published">2004</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Animals</term><term>Animals, Domestic (growth & development)</term><term>Animals, Domestic (physiology)</term><term>British Columbia</term><term>Environment</term><term>Feeding Behavior (physiology)</term><term>Linear Models</term><term>Oncorhynchus mykiss (growth & development)</term><term>Oncorhynchus mykiss (physiology)</term><term>Population Dynamics</term><term>Predatory Behavior</term><term>Risk-Taking</term></keywords><keywords scheme="MESH" type="geographic" xml:lang="en"><term>British Columbia</term></keywords><keywords scheme="MESH" qualifier="growth & development" xml:lang="en"><term>Animals, Domestic</term><term>Oncorhynchus mykiss</term></keywords><keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Animals, Domestic</term><term>Feeding Behavior</term><term>Oncorhynchus mykiss</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Animals</term><term>Environment</term><term>Linear Models</term><term>Population Dynamics</term><term>Predatory Behavior</term><term>Risk-Taking</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">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.</div></front></TEI><affiliations><list><country><li>Canada</li></country><region><li>Manitoba</li></region><settlement><li>Winnipeg</li></settlement><orgName><li>Université du Manitoba</li></orgName></list><tree><noCountry><name sortKey="Abrahams, Mark V" sort="Abrahams, Mark V" uniqKey="Abrahams M" first="Mark V" last="Abrahams">Mark V. Abrahams</name><name sortKey="Parkinson, Eric A" sort="Parkinson, Eric A" uniqKey="Parkinson E" first="Eric A" last="Parkinson">Eric A. Parkinson</name><name sortKey="Post, John R" sort="Post, John R" uniqKey="Post J" first="John R" last="Post">John R. Post</name></noCountry><country name="Canada"><region name="Manitoba"><name sortKey="Biro, Peter A" sort="Biro, Peter A" uniqKey="Biro P" first="Peter A" last="Biro">Peter A. Biro</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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