Using Reciprocal Transplants to Assess Local Adaptation, Genetic Rescue, and Sexual Selection in Newly Established Populations
Small populations establishing on colonization fronts have to adapt to novel environments with limited genetic variation. The pace at which they can adapt, and the influence of genetic variation on their success, are key questions for understanding intraspecific diversity. To investigate these topic...
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| Format: | Article |
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MDPI AG
2020-12-01
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| Series: | Genes |
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| Online Access: | https://www.mdpi.com/2073-4425/12/1/5 |
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| author | Jacques Labonne Aurélie Manicki Louise Chevalier Marin Tétillon François Guéraud Andrew P. Hendry |
| author_facet | Jacques Labonne Aurélie Manicki Louise Chevalier Marin Tétillon François Guéraud Andrew P. Hendry |
| author_sort | Jacques Labonne |
| collection | DOAJ |
| description | Small populations establishing on colonization fronts have to adapt to novel environments with limited genetic variation. The pace at which they can adapt, and the influence of genetic variation on their success, are key questions for understanding intraspecific diversity. To investigate these topics, we performed a reciprocal transplant experiment between two recently founded populations of brown trout in the sub-Antarctic Kerguelen Islands. Using individual tagging and genetic assignment methods, we tracked the fitness of local and foreign individuals, as well as the fitness of their offspring over two generations. In both populations, although not to the same extent, gene flow occurred between local and foreign gene pools. In both cases, however, we failed to detect obvious footprints of local adaptation (which should limit gene flow) and only weak support for genetic rescue (which should enhance gene flow). In the population where gene flow from foreign individuals was low, no clear differences were observed between the fitness of local, foreign, and F1 hybrid individuals. In the population where gene flow was high, foreign individuals were successful due to high mating success rather than high survival, and F1 hybrids had the same fitness as pure local offspring. These results suggest the importance of considering sexual selection, rather than just local adaptation and genetic rescue, when evaluating the determinants of success in small and recently founded populations. |
| first_indexed | 2024-03-10T13:51:12Z |
| format | Article |
| id | doaj.art-cbdac17835cf40cb9036618614d77998 |
| institution | Directory Open Access Journal |
| issn | 2073-4425 |
| language | English |
| last_indexed | 2024-03-10T13:51:12Z |
| publishDate | 2020-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Genes |
| spelling | doaj.art-cbdac17835cf40cb9036618614d779982023-11-21T02:09:04ZengMDPI AGGenes2073-44252020-12-01121510.3390/genes12010005Using Reciprocal Transplants to Assess Local Adaptation, Genetic Rescue, and Sexual Selection in Newly Established PopulationsJacques Labonne0Aurélie Manicki1Louise Chevalier2Marin Tétillon3François Guéraud4Andrew P. Hendry5Université de Pau et des Pays de l’Adour, UMR INRAE-UPPA, Ecobiop, FR-64310 Saint-Pée sur Nivelle, FranceUniversité de Pau et des Pays de l’Adour, UMR INRAE-UPPA, Ecobiop, FR-64310 Saint-Pée sur Nivelle, FranceUniversité de Pau et des Pays de l’Adour, UMR INRAE-UPPA, Ecobiop, FR-64310 Saint-Pée sur Nivelle, FranceUniversité de Pau et des Pays de l’Adour, UMR INRAE-UPPA, Ecobiop, FR-64310 Saint-Pée sur Nivelle, FranceUniversité de Pau et des Pays de l’Adour, UMR INRAE-UPPA, Ecobiop, FR-64310 Saint-Pée sur Nivelle, FranceRedpath Museum and Department of Biology, McGill University, Montreal, QC H3A 0C4, CanadaSmall populations establishing on colonization fronts have to adapt to novel environments with limited genetic variation. The pace at which they can adapt, and the influence of genetic variation on their success, are key questions for understanding intraspecific diversity. To investigate these topics, we performed a reciprocal transplant experiment between two recently founded populations of brown trout in the sub-Antarctic Kerguelen Islands. Using individual tagging and genetic assignment methods, we tracked the fitness of local and foreign individuals, as well as the fitness of their offspring over two generations. In both populations, although not to the same extent, gene flow occurred between local and foreign gene pools. In both cases, however, we failed to detect obvious footprints of local adaptation (which should limit gene flow) and only weak support for genetic rescue (which should enhance gene flow). In the population where gene flow from foreign individuals was low, no clear differences were observed between the fitness of local, foreign, and F1 hybrid individuals. In the population where gene flow was high, foreign individuals were successful due to high mating success rather than high survival, and F1 hybrids had the same fitness as pure local offspring. These results suggest the importance of considering sexual selection, rather than just local adaptation and genetic rescue, when evaluating the determinants of success in small and recently founded populations.https://www.mdpi.com/2073-4425/12/1/5genetic rescuelocal adaptationmating successgene flowsmall population |
| spellingShingle | Jacques Labonne Aurélie Manicki Louise Chevalier Marin Tétillon François Guéraud Andrew P. Hendry Using Reciprocal Transplants to Assess Local Adaptation, Genetic Rescue, and Sexual Selection in Newly Established Populations Genes genetic rescue local adaptation mating success gene flow small population |
| title | Using Reciprocal Transplants to Assess Local Adaptation, Genetic Rescue, and Sexual Selection in Newly Established Populations |
| title_full | Using Reciprocal Transplants to Assess Local Adaptation, Genetic Rescue, and Sexual Selection in Newly Established Populations |
| title_fullStr | Using Reciprocal Transplants to Assess Local Adaptation, Genetic Rescue, and Sexual Selection in Newly Established Populations |
| title_full_unstemmed | Using Reciprocal Transplants to Assess Local Adaptation, Genetic Rescue, and Sexual Selection in Newly Established Populations |
| title_short | Using Reciprocal Transplants to Assess Local Adaptation, Genetic Rescue, and Sexual Selection in Newly Established Populations |
| title_sort | using reciprocal transplants to assess local adaptation genetic rescue and sexual selection in newly established populations |
| topic | genetic rescue local adaptation mating success gene flow small population |
| url | https://www.mdpi.com/2073-4425/12/1/5 |
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