Abstract
Genetic admixture between captive-bred and wild individuals has been demonstrated to affect many individual traits, although little is known about its potential influence on dispersal, an important trait governing the eco-evolutionary dynamics of populations. Here, we quantified and described the spatial distribution of genetic admixture in a brown trout (Salmo trutta) population from a small watershed that was stocked until 1999, and then tested whether or not individual dispersal parameters were related to admixture between wild and captive-bred fish. We genotyped 715 fish at 17 microsatellite loci sampled from both the mainstream and all populated tributaries, as well as 48 fish from the hatchery used to stock the study area. First, we used Bayesian clustering to infer local genetic structure and to quantify genetic admixture. We inferred first generation migrants to identify dispersal events and test which features (genetic admixture, sex and body length) affected dispersal parameters (i.e. probability to disperse, distance of dispersal and direction of the dispersal event). We identified two genetic clusters in the river basin, corresponding to wild fish on the one hand and to fish derived from the captive strain on the other hand, allowing us to define an individual gradient of admixture. Individuals with a strong assignment to the captive strain occurred almost exclusively in some tributaries, and were more likely to disperse towards a tributary than towards a site of the mainstream. Furthermore, dispersal probability increased as the probability of assignment to the captive strain increased, and individuals with an intermediate level of admixture exhibited the lowest dispersal distances. These findings show that various dispersal parameters may be biased by admixture with captive-bred genotypes, and that management policies should take into account the differential spread of captive-bred individuals in wild populations.
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Raw data are deposited on figshare. https://doi.org/10.6084/m9.figshare.6886670.
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Acknowledgements
We warmly thank the AAPPMA of Luchon (Jean Lérimé, Daniel Estrade and colleagues) and ECOGEA (Jean-Marc Lascaux, Philippe Baran and colleagues) for field sampling support. The genetic data were generated at the molecular genetics technical facilities of the Genopole Midi-Pyrénées (Toulouse, France). This work was undertaken at SETE, which forms part of the “Laboratoire d’Excellence” (LABEX) entitled TULIP (ANR-10-LABX-41).
Funding
This work was funded by the French Agency for Biodiversity (No. 136406) and Electricité De France (No. 8619-5920011137).
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SB, NP and LT designed the experiment and coordinated the study; KSP, SB, NP, LT, OP, GL and CV conducted sampling; KSP, GL and CV carried out the experimental lab work; KSP and JGP ran the statistical analyses; KSP, JGP, SB, NP, LT, OP, GL and CV interpreted the data. KSP, SB, and JGP wrote the first draft of the manuscript. NP, LT, OP, GL and CV read, commented and corrected the initial draft, and all authors gave final approval for publication.
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Saint-Pé, K., Blanchet, S., Tissot, L. et al. Genetic admixture between captive-bred and wild individuals affects patterns of dispersal in a brown trout (Salmo trutta) population. Conserv Genet 19, 1269–1279 (2018). https://doi.org/10.1007/s10592-018-1095-2
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DOI: https://doi.org/10.1007/s10592-018-1095-2