Document Detail

Role of introduction history and landscape in the range expansion of brown trout (Salmo trutta L.) in the Kerguelen Islands.
MedLine Citation:
PMID:  20133353     Owner:  NLM     Status:  MEDLINE    
Human-mediated biological invasions constitute interesting case studies to understand evolutionary processes, including the role of founder effects. Population expansion of newly introduced species can be highly dependant on barriers caused by landscape features, but identifying these barriers and their impact on genetic structure is a relatively recent concern in population genetics and ecology. Salmonid populations of the Kerguelen Islands archipelago are a favorable model system to address these questions as these populations are characterized by a simple history of introduction, little or no anthropogenic influence, and demographic monitoring since the first introductions. We analyzed genetic variation at 10 microsatellite loci in 19 populations of brown trout (Salmo trutta L.) in the Courbet Peninsula (Kerguelen Islands), where the species, introduced in 3 rivers only, has colonized the whole water system in 40 years. Despite a limited numbers of introductions, trout populations have maintained a genetic diversity comparable with what is found in hatchery or wild populations in Europe, but they are genetically structured. The main factor explaining the observed patterns of genetic diversity is the history of introductions, with each introduced population acting as a source for colonization of nearby rivers. Correlations between environmental and genetic parameters show that within each "source population" group, landscape characteristics (type of coast, accessibility of river mouth, distances between rivers, river length ...) play a role in shaping directions and rates of migration, and thus the genetic structure of the colonizing populations.
Sophie Launey; Geraldine Brunet; René Guyomard; Patrick Davaine
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-02-04
Journal Detail:
Title:  The Journal of heredity     Volume:  101     ISSN:  1465-7333     ISO Abbreviation:  J. Hered.     Publication Date:    2010 May-Jun
Date Detail:
Created Date:  2010-04-16     Completed Date:  2010-07-16     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0375373     Medline TA:  J Hered     Country:  United States    
Other Details:
Languages:  eng     Pagination:  270-83     Citation Subset:  IM    
Institut National de la Recherche Agronomique, Laboratoire de Génétique des Poissons, Domaine de Vilvert, F-78352 Jouy en Josas, France.
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MeSH Terms
Animal Migration
Antarctic Regions
Genetic Variation
Microsatellite Repeats / genetics
Trout / genetics*,  physiology*

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