Genetic diversity of a Daugava basin brown trout (Salmo trutta) brood stock

Abstract

-Genetics play an increasingly important role in the conservation of threatened fish populations. We have examined twelve microsatellite markers to determine the genetic diversity of a brood stock of brown trout from the Latvian Daugava river basin, used in a local supportive breeding program and compared diversity values to other Baltic populations. Allelic data was further inspected for indications of increased inbreeding. Additionally, we have analyzed the mitochondrial control region to classify the population within a broader phylogenetic framework. We found that the genetic diversity was comparatively low, but there was no strong evidence of high inbreeding. A newly detected mitochondrial haplotype indicates unnoticed genetic diversity of "Atlantic lineage" brown trout in the Daugava basin region. Our study provides first genetic details on resident brown trout from the Baltic Daugava river basin to improve the regional conservation management of this valuable genetic resource and contributes phylogeographically useful information.Keywords: ex situ conservation / individual inbreeding coefficient F / D-loop / effective population size N e / salmonids Résumé -Diversité génétique d'un stock de géniteurs de truite brune (Salmo trutta) du bassin de la Daugava. La génétique joue un rôle de plus en plus important dans la conservation des populations de poissons menacées. Nous avons examiné douze marqueurs microsatellites pour déterminer la diversité génétique d'un stock de géniteurs de truite du bassin letton de la Daugava, utilisé dans le cadre d'un programme de reproduction locale et comparé les valeurs de diversité à celles d'autres populations baltes. Les données sur les allèles ont été analysées plus à fond afin de déceler des signes d'augmentation de la consanguinité. De plus, nous avons analysé la région de contrôle mitochondrial pour classer la population dans un cadre phylogénétique plus large. Nous avons constaté que la diversité génétique était comparativement faible, mais qu'il n' y avait pas de preuves solides de consanguinité élevée. Un haplotype mitochondrial nouvellement détecté indique une diversité génétique inaperçue de la truite de "lignée atlantique" dans la région du bassin de la Daugava. Notre étude fournit les premiers détails génétiques sur la truite résidente du bassin de la Daugava baltique afin d'améliorer la gestion régionale de la conservation de cette ressource génétique précieuse et fournit des informations utiles sur le plan phylogéographique.

Reintroduction and stock enhancement of European weatherfish (Misgurnus fossilis L.) in Rhineland-Palatinate and Hesse, Germany

“…However, the successful determination of weatherfish refuges ensured the opportunity of broodstock sampling from populations that might be genetically adapted to local conditions À a factor considered crucial for reintroduction success (Weeks et al, 2011;Cochran-Biederman et al, 2015). A genetic characterization of the populations selected for broodstock sampling might further improve the reintroduction strategy with respect to prioritization possibilities (Attard et al, 2016;Schmidt et al, 2017). Numerous ditch systems located in the study area generally met the species requirements but lacked suitable spawning habitats like floodplains because ditches typically prevent water from bursting its banks (Dollinger et al, 2015).…”

Genetic diversity management of sculpin (Cottus spp.) and brown trout (Salmo trutta) in the Palatinate Forest-North Vosges Biosphere Reserve

“…Even within a single species it can be problematic to compare absolute diversity values between regions or even studies (e.g. Schmidt et al, 2017). Consequently, it is difficult to evaluate such values, as it is necessary for management decisions.…”

Trends of Eurasian Perch (Perca fluviatilis) mtDNA ATP6 Region Genetic Diversity within the Hydro-Systems of the Eastern Part of the Baltic Sea in the Anthropocene

“…In addition, many freshwater fish species are either commercially exploited [23,27] or keystone species [28]. Even though a large body of data concerning the distribution, abundance, and ecology of many fish species, both in freshwater and brackish environments [29,30], has been collected, the findings on their intraspecific genetic variability [22,[31][32][33], phylogeographic relationships [34][35][36], and postglacial history [24,37,38] remain fragmented. Furthermore, such data are quite limited even for extensively studied fish species [20,39].…”