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  1. #1
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    May 2009
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    Loss of regional population structure in Atlantic salmon, following stocking

    Loss of regional population structure in Atlantic salmon, Salmo salar L., following stocking


    Fernando Ayllon, Jose L. Martinez and Eva Garcia-Vazquez*

    Departamento de Biologia Funcional, Facultad de Medicina, Universidad de Oviedo 33006 Oviedo, Spain

    Many wild Atlantic salmon populations have been stocked with cultured fish during the past century. To evaluate the degree and the direction of the resulting genetic changes in wild southern European populations of Atlantic salmon, the variation at microsatellite loci was examined in historical and modern scale samples from five Spanish and two French rivers. Significant genetic differentiation between neighbouring rivers, which is typical of Atlantic salmon and which existed before stocking, appears to have been lost after only a decade of stocking with fish of foreign origin. Apparent introgression of foreign-origin genes into local gene pools was detected in the populations studied. These results indicate that stocking risks the loss of genetic diversity in wild salmon populations.

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  2. #2
    Junior Member
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    Jun 2009
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    A good article; thought provoking and complementing other threads on hatchery interference and those of declining runs on some Spanish rivers on this Forum.

    Unlike many the above opens in full. Thank you Editor.

    I've taken the liberty of linking the regional rivers map together with a short review extract:

    Because Atlantic salmon, Salmo salar L., exhibit a high degree of homing and fidelity to their natal river, gene flow between local populations is minimal, and salmon inhabiting neighbouring rivers are reproductively isolated. This substantial isolation has facilitated genetic differentiation among wild Atlantic salmon populations..

    ... As a consequence, Atlantic salmon populations exhibit high spatial differentiation at every geographic level examined, from continents to rivers within a region (King et al., 2001).

    In recent years, many salmon populations have declined and some populations, particularly at the southern limit of the range of the species in Europe and North America, are close to extinction...

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