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Identification and conservation of remnant genetic resources of brown trout in relict populations from Western Mediterranean streams

Brown trout is a cold-adapted freshwater species with restricted distribution to headwater streams in rivers of the South European peninsulas, where populations are highly vulnerable because Mediterranean regions are highly sensitive to the global climatic warming. Moreover, these populations are endangered due to the introgressive hybridization with cultured stocks. Individuals from six remnant populations in Western Mediterranean rivers were sequenced for the complete mitochondrial DNA control region and genotyped for 11 nuclear markers. Three different brown trout lineages were present in the studied region. Significant genetic divergence was observed among locations and a strong effect of genetic drift was suggested. An important stocking impact (close to 25%) was detected in the zone. Significant correlations between mitochondrial-based rates of hatchery introgression and water flow variation suggested a higher impact of stocked females in unstable habitats. In spite of hatchery introgression, all populations remained highly differentiated, suggesting that native genetic resources are still abundant. However, climatic predictions indicated that suitable habitats for the species in these rivers will be reduced and hence trout populations are highly endangered and vulnerable. Thus, management policies should take into account these predictions to design upstream refuge areas to protect remnant native trout in the region

© Hydrobiologia, 2013, vol. 707, p. 29-45

Springer Science; Business Media Dordrecht

Author: Vera Rodríguez, Manuel
García Marín, José Luis
Martínez, Paulino
Araguas Solà, Rosa M.
Bouza da Costa, Carmen
Date: 2013
Abstract: Brown trout is a cold-adapted freshwater species with restricted distribution to headwater streams in rivers of the South European peninsulas, where populations are highly vulnerable because Mediterranean regions are highly sensitive to the global climatic warming. Moreover, these populations are endangered due to the introgressive hybridization with cultured stocks. Individuals from six remnant populations in Western Mediterranean rivers were sequenced for the complete mitochondrial DNA control region and genotyped for 11 nuclear markers. Three different brown trout lineages were present in the studied region. Significant genetic divergence was observed among locations and a strong effect of genetic drift was suggested. An important stocking impact (close to 25%) was detected in the zone. Significant correlations between mitochondrial-based rates of hatchery introgression and water flow variation suggested a higher impact of stocked females in unstable habitats. In spite of hatchery introgression, all populations remained highly differentiated, suggesting that native genetic resources are still abundant. However, climatic predictions indicated that suitable habitats for the species in these rivers will be reduced and hence trout populations are highly endangered and vulnerable. Thus, management policies should take into account these predictions to design upstream refuge areas to protect remnant native trout in the region
Format: application/pdf
ISSN: 0018-8158 (versió paper)
1573-5117 (versió electrònica)
0018-8158
Document access: http://hdl.handle.net/10256/9743
Language: eng
Publisher: Springer Science; Business Media Dordrecht
Collection: Versió postprint del document publicat a: http://dx.doi.org/10.1007/s10750-012-1402-8
Articles publicats (D-B)
Is part of: © Hydrobiologia, 2013, vol. 707, p. 29-45
Rights: Tots els drets reservats
Subject: Canvi mediambiental global
Global environmental change
Genètica de poblacions
Population genetics
Truites (Peixos) -- Aspectes genètics
Trout -- Genetic aspects
Title: Identification and conservation of remnant genetic resources of brown trout in relict populations from Western Mediterranean streams
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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