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Adaptive markers distinguish North and South Pacific Albacore amid low population differentiation

Albacore (Thunnus alalunga) support an economically valuable global fishery, but surprisingly little is known about the population structure of this highly migratory species. Physical tagging data suggest that Albacore from the North and South Pacific Ocean are separate stocks, but results from prev...

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Autores principales: Vaux, Felix, Bohn, Sandra, Hyde, John R., O'Malley, Kathleen G.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8127716/
https://www.ncbi.nlm.nih.gov/pubmed/34025772
http://dx.doi.org/10.1111/eva.13202
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author Vaux, Felix
Bohn, Sandra
Hyde, John R.
O'Malley, Kathleen G.
author_facet Vaux, Felix
Bohn, Sandra
Hyde, John R.
O'Malley, Kathleen G.
author_sort Vaux, Felix
collection PubMed
description Albacore (Thunnus alalunga) support an economically valuable global fishery, but surprisingly little is known about the population structure of this highly migratory species. Physical tagging data suggest that Albacore from the North and South Pacific Ocean are separate stocks, but results from previous genetic studies did not support this two stock hypothesis. In addition, observed biological differences among juveniles suggest that there may be population substructure in the North Pacific. We used double‐digest restriction site‐associated DNA sequencing to assess population structure among 308 Albacore caught in 12 sample areas across the Pacific Ocean (10 North, 2 South). Since Albacore are highly migratory and spawning areas are unknown, sample groups were not assumed to be equivalent to populations and the genetic data were analyzed iteratively. We tested for putatively adaptive differences among groups and for genetic variation associated with sex. Results indicated that Albacore in the North and South Pacific can be distinguished using 84 putatively adaptive loci, but not using the remaining 12,788 presumed neutral sites. However, two individuals likely represent F1 hybrids between the North and South Pacific populations, and 43 Albacore potentially exhibit lower degrees of mixed ancestry. In addition, four or five cross‐hemisphere migrants were potentially identified. No genetic evidence was found for population substructure within the North Pacific, and no loci appeared to distinguish males from females. Potential functions for the putatively adaptive loci were identified, but an annotated Albacore genome is required for further exploration. Future research should try to locate spawning areas so that life history, demography, and genetic population structure can be linked and spatiotemporal patterns can be investigated.
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spelling pubmed-81277162021-05-21 Adaptive markers distinguish North and South Pacific Albacore amid low population differentiation Vaux, Felix Bohn, Sandra Hyde, John R. O'Malley, Kathleen G. Evol Appl Original Articles Albacore (Thunnus alalunga) support an economically valuable global fishery, but surprisingly little is known about the population structure of this highly migratory species. Physical tagging data suggest that Albacore from the North and South Pacific Ocean are separate stocks, but results from previous genetic studies did not support this two stock hypothesis. In addition, observed biological differences among juveniles suggest that there may be population substructure in the North Pacific. We used double‐digest restriction site‐associated DNA sequencing to assess population structure among 308 Albacore caught in 12 sample areas across the Pacific Ocean (10 North, 2 South). Since Albacore are highly migratory and spawning areas are unknown, sample groups were not assumed to be equivalent to populations and the genetic data were analyzed iteratively. We tested for putatively adaptive differences among groups and for genetic variation associated with sex. Results indicated that Albacore in the North and South Pacific can be distinguished using 84 putatively adaptive loci, but not using the remaining 12,788 presumed neutral sites. However, two individuals likely represent F1 hybrids between the North and South Pacific populations, and 43 Albacore potentially exhibit lower degrees of mixed ancestry. In addition, four or five cross‐hemisphere migrants were potentially identified. No genetic evidence was found for population substructure within the North Pacific, and no loci appeared to distinguish males from females. Potential functions for the putatively adaptive loci were identified, but an annotated Albacore genome is required for further exploration. Future research should try to locate spawning areas so that life history, demography, and genetic population structure can be linked and spatiotemporal patterns can be investigated. John Wiley and Sons Inc. 2021-02-23 /pmc/articles/PMC8127716/ /pubmed/34025772 http://dx.doi.org/10.1111/eva.13202 Text en © 2021 The Authors. Evolutionary Applications published by John Wiley & Sons Ltd https://creativecommons.org/licenses/by/4.0/This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Articles
Vaux, Felix
Bohn, Sandra
Hyde, John R.
O'Malley, Kathleen G.
Adaptive markers distinguish North and South Pacific Albacore amid low population differentiation
title Adaptive markers distinguish North and South Pacific Albacore amid low population differentiation
title_full Adaptive markers distinguish North and South Pacific Albacore amid low population differentiation
title_fullStr Adaptive markers distinguish North and South Pacific Albacore amid low population differentiation
title_full_unstemmed Adaptive markers distinguish North and South Pacific Albacore amid low population differentiation
title_short Adaptive markers distinguish North and South Pacific Albacore amid low population differentiation
title_sort adaptive markers distinguish north and south pacific albacore amid low population differentiation
topic Original Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8127716/
https://www.ncbi.nlm.nih.gov/pubmed/34025772
http://dx.doi.org/10.1111/eva.13202
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