Genetic introgression on freshwater fish populations caused by restocking programmes |
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Authors: | María José Madeira Benjamín J Gómez-moliner Annie Machordom Barbé |
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Institution: | (1) Facultad de Farmacia, Departamento de Zoología y Dinámica Celular Animal, Universidad del País Vasco, c/ Paseo de la Universidad, 7, Vitoria, 01006, Spain;(2) Departamento de Biodiversidad y Biología Evolutiva, Museo Nacional de Ciencias Naturales (CSIC), c/ José Gutiérrez Abascal, 2, Madrid, 28006, Spain |
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Abstract: | The brown trout (Salmo trutta L.) is one of the best studied native salmonids of Europe. Genetic studies on this species suggest that a large proportion
of the evolutionary diversity corresponds to southern European countries, including the Iberian Peninsula, where this study
is focused. Stocking activities employing non-indigenous hatchery specimens together with the destruction and fragmentation
of natural habitats are major factors causing a decrease of native brown trout populations, mostly in the Mediterranean basins
of the Iberian Peninsula. The main aim of the present work is to examine the genetic structure of the brown trout populations
of the East Cantabrian region, studying the consequences of the restocking activities with foreign hatchery brown trout specimens
into the wild trout populations. We have based our study on the Polymerase Chain Reaction and Restriction Fragment Length
Polymorphism technique conducted on a mitochondrial fragment of 2700 base pairs and on the lactate dehydrogenase locus of
the nuclear DNA. Our results show higher introgression rates in the Ebro (Mediterranean) basin than in the Cantabrian rivers.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | brown trout genetic introgression LDH-C* management mtDNA PCR-RFLP |
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