Identification of an endemic Mediterranean brown trout mtDNA group within a highly perturbed aquatic system, the Llobregat River (NE Spain)

Brown trout ( Salmo trutta L.) is an important resource both for conservation and recreational fisheries in Iberian Peninsula, but the species is threatened in Llobregat River, an important river drainage in Catalonia (NE Spain), due to the high anthropological influence. In order to ascertain the n...

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Bibliographic Details
Published in:Hydrobiologia 2019, Vol.827 (1), p.277-291
Main Authors: Vera, M., Bouza, C., Casanova, A., Heras, S., Martínez, P., García-Marín, J. L.
Format: Article
Language:English
Subjects:
Aquatic environment
Biomedical and Life Sciences
Conservation
Deoxyribonucleic acid
Diagnostic systems
DNA
Drainage
Ecology
Endemic species
Fish
Fisheries
Freshwater & Marine Ecology
Freshwater fishes
Genetic analysis
Genetic diversity
Genetic drift
Genetic variation
Introgression
Life Sciences
Mitochondrial DNA
Phylogeny
Population differentiation
Population genetics
Population structure
Primary Research Paper
Resource conservation
Resource management
Rivers
Salmo trutta
Stocking
Sustainability
Threatened species
Trout
Zoology
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Summary:Brown trout ( Salmo trutta L.) is an important resource both for conservation and recreational fisheries in Iberian Peninsula, but the species is threatened in Llobregat River, an important river drainage in Catalonia (NE Spain), due to the high anthropological influence. In order to ascertain the native genetic diversity, phylogenetic relationships, population structure and stocking impact in this drainage, 295 individuals collected from eight different locations distributed throughout the main river course and the main tributary (i.e. Llobregat River and Cardener River, respectively) were analysed for the period 1990–2017. The complete mitochondrial DNA (mtDNA) control region and the LDH-C* diagnostic locus for monitoring the stocking were analysed. Moderate-high levels of genetic introgression were detected (frequency ~ 0.300), affecting especially the main course. Despite the stocking introgression and the expected genetic depletion by genetic drift due to population isolation, a new mtDNA haplotype group pertaining to the Mediterranean lineage was found restricted to the Cardener River. This haplogroup is responsible of the high population differentiation observed between rivers in the Llobregat drainage ( Φ CT  = 0.456, P  
ISSN:0018-8158
1573-5117
DOI:10.1007/s10750-018-3775-9