Management units of brown trout from Galicia (NW: Spain) based on spatial genetic structure analysis

Population genetic structure approaches offer the possibility of defining management units in conservation activities of species. The genetic structure of the brown trout Salmo trutta in Galicia (NW Spain) was investigated by using microsatellites. We determined genetic variation across 10 microsate...

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Bibliographic Details
Published in:Conservation genetics 2010-06, Vol.11 (3), p.897-906
Main Authors: Vilas, Román, Bouza, C, Castro, J, López, A, Martínez, P
Format: Article
Language:English
Subjects:
Animal Genetics and Genomics
Animal populations
Biodiversity
Biomedical and Life Sciences
Conservation biology
Conservation Biology/Ecology
Conservation genetics
Ecology
Endemism
Evolutionary Biology
Genetic diversity
Genetic structure
Life Sciences
Management units
Metapopulations
microsatellite repeats
Plant Genetics and Genomics
Population genetics
Research Article
River basins
Rivers
Salmo trutta
Spatial analysis
Spatial distribution
Trout
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Summary:Population genetic structure approaches offer the possibility of defining management units in conservation activities of species. The genetic structure of the brown trout Salmo trutta in Galicia (NW Spain) was investigated by using microsatellites. We determined genetic variation across 10 microsatellite loci of 901 individuals from 30 geographical populations representing 18 river basins. The analysis of the spatial distribution of the genetic variation by using different methods clearly revealed strong genetic differentiation among two groups of populations living in the studied area. This result is concordant with previous work using allozymes and mtDNA markers, and confirms a secondary contact among two highly differentiated evolutionary lineages in Miño Basin. Although both lineages might be locally adapted, results suggest that they hybridize at the middle course of the river. The brown trout from the Upper Miño Basin belongs to the previously described Duero lineage, an Iberian endemism threatened by introgression with other Atlantic forms. The results support the recognition of the Upper Miño Basin as a particular biotic region in Galicia. This study illustrates how a multidisciplinary approach in spatial genetic analysis contributes to the delineation of conservation units as conspecific metapopulations.
ISSN:1566-0621
1572-9737
DOI:10.1007/s10592-009-9934-9