Compromising genetic diversity in the wild: unmonitored large-scale release of plants and animals

Laikre, Linda; Schwartz, Michael K.; Waples, Robin S.; Ryman, Nils

doi:10.1016/j.tree.2010.06.013

Cited by 488 publications

(511 citation statements)

References 78 publications

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“…This would provide opportunities to better assess the extent of the reproductive success of hatchery-born scallops in the wild and their impact on the effective population size and genetic diversity of seeded populations. Moreover, further investigations are required to evaluate whether the reproductive contribution of hatchery populations may affect the local adaptation of wild populations and their adaptive potential to environmental changes (see Laikre et al, 2010). This issue appears particularly crucial to ensure the long-term persistence of enhanced populations, particularly in a context of global changes.…”

Section: Conclusion: Sea Ranching or Stock Enhancement?mentioning

confidence: 99%

Stock enhancement or sea ranching? Insights from monitoring the genetic diversity, relatedness and effective population size in a seeded great scallop population (Pecten maximus)

et al. 2016

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The mass release of hatchery-propagated stocks raises numerous questions concerning its efficiency in terms of local recruitment and effect on the genetic diversity of wild populations. A seeding program, consisting of mass release of hatchery-produced juveniles in the local naturally occurring population of great scallops (Pecten maximus L.), was initiated in the early 1980s in the Bay of Brest (France). The present study aims at evaluating whether this seeding program leads to actual population enhancement, with detectable effects on genetic diversity and effective population size, or consists of sea ranching with limited genetic consequences on the wild stock. To address this question, microsatellite-based genetic monitoring of three hatchery-born and naturally recruited populations was conducted over a 5-year period. Results showed a limited reduction in allelic richness but a strong alteration of allelic frequencies in hatchery populations, while genetic diversity appeared very stable over time in the wild populations. A temporal increase in relatedness was observed in both cultured stock and wild populations. Effective population size (Ne) estimates were low and variable in the wild population. Moreover, the application of the Ryman-Laikre model suggested a high contribution of hatchery-born scallops to the reproductive output of the wild population. Overall, the data suggest that the main objective of the seeding program, which is stock enhancement, is fulfilled. Moreover, gene flow from surrounding populations and/or the reproductive input of undetected sub-populations within the bay may buffer the Ryman-Laikre effect and ensure the retention of the local genetic variability.

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Section: Conclusion: Sea Ranching or Stock Enhancement?mentioning

confidence: 99%

Stock enhancement or sea ranching? Insights from monitoring the genetic diversity, relatedness and effective population size in a seeded great scallop population (Pecten maximus)

et al. 2016

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“…Repopulation programs may not only help in the reconstruction of populations but even minimize impacts on the abundance of several fish species caused by excessive fishing and the destruction of their natural habitat. However, genetic repercussions caused by the introduction of other specimens over the wild population structure should be taken into account (Laikre et al 2010;González-Wangüemert et al 2012). The genetic characteristics of fish groups released in certain environments through repopulation program are highly relevant due to the genetic impact on wild populations.…”

Section: Introductionmentioning

confidence: 99%

Genetic Variability of Brycon hilarii in a Repopulation Program

Bignardi

Povh

Alves

et al. 2016

Braz. arch. biol. technol.

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“…Human exploitation of natural populations, including harvesting and large-scale releases, are expected to potentially result in genetic changes of native gene pools, and effects of such operations are particularly important to monitor (Allendorf et al, 2008;Laikre et al, 2010). Salmonid fishes are subject to large-scale commercial and sport fishing and releases worldwide.…”

Section: Introductionmentioning

confidence: 99%

Genetic monitoring reveals temporal stability over 30 years in a small, lake-resident brown trout population

2012

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Knowledge of the degree of temporal stability of population genetic structure and composition is important for understanding microevolutionary processes and addressing issues of human impact of natural populations. We know little about how representative single samples in time are to reflect population genetic constitution, and we explore the temporal genetic variability patterns over a 30-year period of annual sampling of a lake-resident brown trout (Salmo trutta) population, covering 37 consecutive cohorts and five generations. Levels of variation remain largely stable over this period, with no indication of substructuring within the lake. We detect genetic drift, however, and the genetically effective population size (N e ) was assessed from allele-frequency shifts between consecutive cohorts using an unbiased estimator that accounts for the effect of overlapping generation. The overall mean N e is estimated as 74. We find indications that N e varies over time, but there is no obvious temporal trend. We also estimated N e using a one-sample approach based on linkage disequilibrium (LD) that does not account for the effect of overlapping generations. Combining one-sample estimates for all years gives an N e estimate of 76. This similarity between estimates may be coincidental or reflecting a general robustness of the LD approach to violations of the discrete generations assumption. In contrast to the observed genetic stability, body size and catch per effort have increased over the study period. Estimates of annual effective number of breeders (N b ) correlated with catch per effort, suggesting that genetic monitoring can be used for detecting fluctuations in abundance.

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Compromising genetic diversity in the wild: unmonitored large-scale release of plants and animals

Cited by 488 publications

References 78 publications

Stock enhancement or sea ranching? Insights from monitoring the genetic diversity, relatedness and effective population size in a seeded great scallop population (Pecten maximus)

Stock enhancement or sea ranching? Insights from monitoring the genetic diversity, relatedness and effective population size in a seeded great scallop population (Pecten maximus)

Genetic Variability of Brycon hilarii in a Repopulation Program

Genetic monitoring reveals temporal stability over 30 years in a small, lake-resident brown trout population

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