Conservation Genetics

, Volume 3, Issue 4, pp 385–400

Managing fish populations under mosaic relationships. The case of brown trout (Salmo trutta) in peripheral Mediterranean populations

  • N. Sanz Ball-llosera
  • J.L. Garcìa-Marìn
  • C. Pla
Article

DOI: 10.1023/A:1020527420654

Cite this article as:
Sanz Ball-llosera, N., Garcìa-Marìn, J. & Pla, C. Conservation Genetics (2002) 3: 385. doi:10.1023/A:1020527420654

Abstract

Brown trout were collected from 36 locations inthe Iberian Peninsula representing thesouthwestern extreme of this species'distribution in Mediterranean drainages.Allelic distributions among these peripheralpopulations for 26 polymorphic allozyme loci(corrected to remove effects of introgressionfrom exogenous hatchery introductions)indicated a mosaic pattern both within andamong drainages. This distribution wasinterpreted to reflect reticular evolutionaryprocesses involving multiple colonizationepisodes by distinct lineages, secondaryintergradations, and drift. Under thisscenario, management to conserve native genepools differs from that commonly used underhierarchical structures (such as in AtlanticIberian drainages) where geographic patternscould justify regional stocking of indigenousfish in adjacent unsampled areas. Because suchaction risks erosion of native populations inthe present case, remedial efforts should focuson habitat recovery and environmental educationprograms, and harvest sustained by naturalreproduction.

brown trout conservation genetic diversity natural hybridisation phylogeny Salmo trutta 

Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • N. Sanz Ball-llosera
    • 1
  • J.L. Garcìa-Marìn
    • 1
  • C. Pla
    • 1
  1. 1.Facultat de CiènciesLaboratori d'Ictiologia genèticaGironaSpain

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