Dispersal and rapid evolution in brown trout colonizing virgin Subantarctic ecosystems

Two brown trout Salmo trutta stocks of different origin (wild Polish, domestic commercial) came into secondary contact after deliberate releases conducted in virgin rivers systems of the Subantarctic Kerguelen Islands (70° E 49° S). Samples obtained in 2001–2003 and a historical sample from 1993 wer...

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Bibliographic Details
Published in:Journal of evolutionary biology 2006-07, Vol.19 (4), p.1352-1358
Main Authors: AYLLON, F., DAVAINE, P., BEALL, E., GARCIA‐VAZQUEZ, E.
Format: Article
Language:English
Subjects:
Animals
Antarctic Regions
Biodiversity
Biological Evolution
colonization
domestication
Ecosystem
gene flow
Life Sciences
population structure
Populations and Evolution
Salmo trutta
Species Specificity
Trout - classification
Trout - genetics
wild stock
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Summary:Two brown trout Salmo trutta stocks of different origin (wild Polish, domestic commercial) came into secondary contact after deliberate releases conducted in virgin rivers systems of the Subantarctic Kerguelen Islands (70° E 49° S). Samples obtained in 2001–2003 and a historical sample from 1993 were analysed for genetic variation at seven microsatellite loci and one allozyme locus (LDH‐C1*). Bayesian clustering analysis demonstrated that rapid genetic differentiation formed separate genetic units in neighbouring rivers in less than 20 years. These genetic units were characterized by a large proportion of Polish genotypes mixed with some genomes of domestic origin (up to 30%). A different colonization strategy of the naturalized stocks, likely related with differential performance, was identified as a cause of rapid population differentiation in this area.
ISSN:1010-061X
1420-9101
DOI:10.1111/j.1420-9101.2005.01075.x