Conservation Genetics

, Volume 3, Issue 4, pp 385-400

First online:

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

  • N. Sanz Ball-lloseraAffiliated withFacultat de Ciències, Laboratori d'Ictiologia genètica Email author 
  • , J.L. Garcìa-MarìnAffiliated withFacultat de Ciències, Laboratori d'Ictiologia genètica
  • , C. PlaAffiliated withFacultat de Ciències, Laboratori d'Ictiologia genètica

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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