Atlantic Salmon in Maine (2004) / Chapter Skim
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Appendix D: Supportive Breeding and Risks to Genetic Quality
Appendix D: Supportive Breeding and Risks to Genetic Quality
Pages 258-260
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From page 258... ...
This loss may reduce the viability of individuals, for example through reduced heterozygosity, and it may also impact the potential evolution of new adaptations by populations over the long term. Concern over the short- and long-term impacts has led managers of supportive breeding programs to develop breeding protocols that retain maximum genetic diversity.
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From page 259... ...
. Sexual selection in natural breeding systems is known to expose heritable genetic quality, through male competition and condition-dependent characters, that is targeted by female choice and increases offspring viability (Møller and Alatalo 1999)
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From page 260... ...
Random breeding and equalization would reduce reproductive skew, increasing genetic variation in freshly fertilized eggs, but both this genetic variation and egg number may later be reduced by directed selection from the egg pathogens. Alternatively, allowing preferential breeding by preferred males would decrease genetic variation in freshly fertilized eggs but increase mean survival of offspring.
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