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Haplotype (mtDNA) diversity of brown trout Salmo trutta in tributaries of the Austrian Danube: massive introgression of Atlantic basin fish — by man or nature?

Authors

  • S. Weiss,

    Corresponding author
    1. Abteilung für Hydrobiologie, Universität für Bodenkultur, Max Emanuel Straße 17, 1180 Vienna;
    2. Institut für Tierzucht und Genetik, Veterinärmedizinische Universität, Veterinärplatz 1, 1210 Vienna, Austria;
    3. Centro de Estudos de Ciência Animal-ICETA, Unidade de Genética Animal e Conservação, Campus Agrário de Vairão, R.Monte-Crasto, 4485–661 Vairão, Portugal
      Steven Weiss. ‡Present address: Centro de Estudos de Ciência Animal-ICETA, Unidade de Genética Animal e Conservação, Campus Agrário de Vairão, R.Monte-Crasto-Vairão, 4485–661 Vila do Conde, Portugal. Fax: + 351–252–661780; E-mail:sjweiss@mail.icav.up.pt
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  • C. Schlötterer,

    1. Institut für Tierzucht und Genetik, Veterinärmedizinische Universität, Veterinärplatz 1, 1210 Vienna, Austria;
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  • H. Waidbacher,

    1. Abteilung für Hydrobiologie, Universität für Bodenkultur, Max Emanuel Straße 17, 1180 Vienna;
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  • M. Jungwirth

    1. Abteilung für Hydrobiologie, Universität für Bodenkultur, Max Emanuel Straße 17, 1180 Vienna;
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Steven Weiss. ‡Present address: Centro de Estudos de Ciência Animal-ICETA, Unidade de Genética Animal e Conservação, Campus Agrário de Vairão, R.Monte-Crasto-Vairão, 4485–661 Vila do Conde, Portugal. Fax: + 351–252–661780; E-mail:sjweiss@mail.icav.up.pt

Abstract

Mitochondrial haplotype diversity in 27 populations of brown trout, Salmo trutta L., in Austria was investigated by sequencing the 5′ end of the mitochondrial DNA (mtDNA) control region. Although all populations are within the Danube drainage, 44% of all individuals carried Atlantic basin haplotypes. It is argued that the presence of these haplotypes in Austria primarily reflects introgression stemming from the stocking of hatchery-reared fish. However, several lines of evidence suggest that some natural colonization from Atlantic lineages may have contributed to the present haplotype diversity. Nonetheless, the more diverse Danubian clade is represented by regionally distinct haplotype diversity that should be protected from the continued introduction of domesticated strains of exogenous fish.

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