Genetic Status of Atlantic Salmon in Maine Interim Report from the Committee on Atlantic Salmon in Maine (2002) / Chapter Skim
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6 Conclusions
6 Conclusions
Pages 46-48
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From page 46... ...
While there is obviously a limit to the adaptive importance we can impute from the population divergence that has been demonstrated, we are reluctant to dismiss local adaptation casually. The pattern of variation is so typical of wild salmon that it suggests considerable genetic cohesion anal resilience of the resiclent populations, in spite of large scale stock releases (over decades)
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From page 47... ...
Whether today 's genetic differences represent a remnant of salmon population structure that predates human intervention, following thousands of years of natural selection and genetic Lift, typical of salmon occupying different habitats with a variety of environmental circumstances, or whether they represent five to six generations of genetic Lift, exacerbated by an increasingly serious population collapse over a short period, is a question that we cannot answer by genetic characterization of neutral genetic markers alone. Any conclusions we draw about the selection/drift dichotomy will necessarily be circumstantial.
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From page 48... ...
The data suggest that current Maine salmon in the DPS rivers are not mainly hatchery mixtures but rather show the typical metapopulation structure that characterizes wild populations of salmon and their relatives in places where stocking has been absent or insignficant. Maine has wild salmon populations in the eight DPS rivers that are as divergent from Canadian populations and from each other as expected among wild salmon populations elsewhere in the Northern Hemisphere.
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