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Document Type:
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Journal Article
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Center:
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NWFSC
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Document ID:
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6720
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Author:
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M. J. Ford, J. J. Hard, B. Boelts, E. LaHood, J. Miller
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Year:
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2008
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Title:
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Estimates of natural selection in a salmon population in captive and natural environments
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Journal:
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Conservation Biology
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Volume:
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22
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Issue:
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3
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Pages:
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783-794
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Date:
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06/01/2008
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Keywords:
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Domestication, artificial propagation, captive breeding, selection, parentage analysis
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Abstract:
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Captive breeding is a commonly used strategy for species conservation. One risk of captive breeding
is domestication selectionselection for traits that are advantageous in captivity but deleterious in the wild.
Domestication selection is of particular concern for species that are bred in captivity for many generations
and that have a high potential to interbreed with wild populations. Domestication is understood conceptually
at a broad level, but relatively little is known about how natural selection differs empirically between wild
and captive environments. We used genetic parentage analysis to measure natural selection on time of
migration, weight, and morphology for a coho salmon (Oncorhynchus kisutch) population that was subdivided
into captive and natural components. Our goal was to determine whether natural selection acting on the
traits we measured differed significantly between the captive and natural environments. For males, larger
individuals were favored in both the captive and natural environments in all years of the study, indicating
that selection on these traits in captivity was similar to that in the wild. For females, selection on weight was
significantly stronger in the natural environment than in the captive environment in 1 year and similar in
the 2 environments in 2 other years. In both environments, there was evidence of selection for later time
of return for both males and females. Selection on measured traits other than weight and run timing was
relatively weak. Our results are a concrete example of how estimates of natural selection during captivity can
be used to evaluate this common risk of captive breeding programs.
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Divisions:
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CB
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Programs:
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Projects:
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Official Citation:
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Ford MJ, Hard JJ, Boelts B, LaHood E, Miller J. 2008. Estimates of natural selection in a salmon population in captive and natural environments. Conservation Biology 22:783-794
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