Relationship between effective population size, inbreeding and adult fitness‐related traits in a steelhead (<i><scp>O</scp>ncorhynchus mykiss</i>) population released in the wild

Naish, Kerry A.; Seamons, Todd R.; Dauer, Michael B.; Hauser, Lorenz; Quinn, Thomas P.

doi:10.1111/mec.12185

Cited by 40 publications

(35 citation statements)

References 68 publications

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“…; Christie et al. ; Naish et al ). In contrast, the ratio N b / N decreased in the F 2 and F 3 generations of the integrated line despite higher N b estimates relative to the segregated line, suggesting that ecological influences such as higher competition on the spawning grounds (Fleming and Gross ) or limited carrying capacity might have influenced this ratio as the population increased in size.…”

Section: Discussionmentioning

confidence: 99%

Effectiveness of managed gene flow in reducing genetic divergence associated with captive breeding

Waters

Hard

Brieuc

et al. 2015

Evolutionary Applications

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Captive breeding has the potential to rebuild depressed populations. However, associated genetic changes may decrease restoration success and negatively affect the adaptive potential of the entire population. Thus, approaches that minimize genetic risks should be tested in a comparative framework over multiple generations. Genetic diversity in two captive-reared lines of a species of conservation interest, Chinook salmon (Oncorhynchus tshawytscha), was surveyed across three generations using genome-wide approaches. Genetic divergence from the source population was minimal in an integrated line, which implemented managed gene flow by using only naturally-born adults as captive broodstock, but significant in a segregated line, which bred only captive-origin individuals. Estimates of effective number of breeders revealed that the rapid divergence observed in the latter was largely attributable to genetic drift. Three independent tests for signatures of adaptive divergence also identified temporal change within the segregated line, possibly indicating domestication selection. The results empirically demonstrate that using managed gene flow for propagating a captive-reared population reduces genetic divergence over the short term compared to one that relies solely on captive-origin parents. These findings complement existing studies of captive breeding, which typically focus on a single management strategy and examine the fitness of one or two generations.

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Section: Discussionmentioning

confidence: 99%

Effectiveness of managed gene flow in reducing genetic divergence associated with captive breeding

Waters

Hard

Brieuc

et al. 2015

Evolutionary Applications

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“…The enhancements have often been reported to have had negative effects on natural populations of fish (Ward 2006). These enhancements have included releases of artificially reared stocks or escapes of large numbers of individuals characterized by lower fitness (Satake and Araki 2011;Baskett et al 2013;Milot et al 2013;Naish et al 2013) and lower genetic diversity have been reported for some species, including Adriatic sturgeon (Boscari and Congiu 2014), Korean starry flounder ) and black sea bream in Japan (Blanco Gonzalez and Umino 2009). Other effects have been introductions of nonindigenous populations, such as salmon in Poland (Poćwierz-Kotus et al 2015a;Bernaś et al 2016); or alien populations of the same species and their subsequent hybridization a Corresponding author: rwenne@iopan.gda.pl with local native populations, as with salmon and brown trout in Bulgaria (Chelenkova et al 2012), Norway (Thaulow et al 2012), Hungary (Horváth et al 2013) and in Spain (Madeira et al 2005), pikeperch in Finland (Salminen et al 2012); unintentional escapes from hatcheries as red sea bream in Japan (Blanco Gonzalez et al 2015), salmon in Norway (Liu et al 2013) and Canada (Fraser et al 2008).…”

Section: Introductionmentioning

confidence: 99%

Recent genetic changes in enhanced populations of sea trout (Salmo truttam.trutta) in the southern Baltic rivers revealed with SNP analysis

Wenne

Bernaś

Poćwierz-Kotus

et al. 2016

Aquat. Living Resour.

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-The genetic structure of a fish population is usually thought to be stable over time. In the southern Baltic, Salmo trutta m. trutta (sea trout) populations have been characterized by low degree of genetic differentiation. All studied populations had been heavily stocked with mixed material for many years prior to the sampling period, including releases of Pomeranian sea trout to the Vistula River in Poland, Southern Baltic. However, the strategy of stocking became river based a few years before the sampling began. Juveniles from artificial reproduction are released only to their parental river, which reduces the mixing of the gene pool of fish from different populations. Changes in sea trout populations in the southern Baltic over time were studied using single nucleotide polymorphisms (SNPs). Genetic composition of populations of sea trout in the Vistula and Drwȩca river system were found to increasingly resemble the non-admixed hatchery population from Aquamar (Miastko, Poland), whereas the Pomeranian populations were stable. The implementation of a new stocking strategy for the restoration and protection of Vistula sea trout was noted as possible explanation. With the increase of natural breeding, artificial enhancement of sea trout populations should be reduced.

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“…Low genetic diversity is often regarded as a warning signal that a population might be or become threatened by increased inbreeding or deleterious genetic drift (e.g. Naish et al, 2013 and citations therein). Thus, maintenance or establishment of high levels of genetic diversity is a common aim of conservation efforts (Saura and Faria, 2011).…”

Section: Discussionmentioning

confidence: 99%

“…Thus, typically the effective population size N e of brood stocks is low, which may lead to adverse genetic effects, such as inbreeding depressions (e.g. Fraser, 2008;Naish et al, 2013). Genetic analyses of brood stocks (spawners or descendants) may indicate such issues early (e.g.…”

Section: Introductionmentioning

confidence: 99%

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

Schmidt

Zagars

Roze

et al. 2017

Knowl. Manag. Aquat. Ecosyst.

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-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.

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Relationship between effective population size, inbreeding and adult fitness‐related traits in a steelhead (Oncorhynchus mykiss) population released in the wild

Cited by 40 publications

References 68 publications

Effectiveness of managed gene flow in reducing genetic divergence associated with captive breeding

Effectiveness of managed gene flow in reducing genetic divergence associated with captive breeding

Recent genetic changes in enhanced populations of sea trout (Salmo truttam.trutta) in the southern Baltic rivers revealed with SNP analysis

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

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