Population structure of blackfin tuna (Thunnus atlanticus) in the western Atlantic Ocean inferred from microsatellite loci
Abstract The blackfin tuna, Thunnus atlanticus, is a small tropical tuna exploited by recreational and commercial fisheries in various parts of its range. Information on stock structure is needed to develop management plans for this species but is currently lacking. In this work, 470 blackfin tuna f...
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| Format: | Article |
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Nature Portfolio
2022-06-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-022-13857-z |
| _version_ | 1811241219180724224 |
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| author | Eric A. Saillant Patricia L. Luque Emily Short Luca Antoni Lionel Reynal Cedric Pau Freddy Arocha Pollyana Roque Fabio Hazin |
| author_facet | Eric A. Saillant Patricia L. Luque Emily Short Luca Antoni Lionel Reynal Cedric Pau Freddy Arocha Pollyana Roque Fabio Hazin |
| author_sort | Eric A. Saillant |
| collection | DOAJ |
| description | Abstract The blackfin tuna, Thunnus atlanticus, is a small tropical tuna exploited by recreational and commercial fisheries in various parts of its range. Information on stock structure is needed to develop management plans for this species but is currently lacking. In this work, 470 blackfin tuna from nine geographic populations were assayed at 13 homologous microsatellite markers to provide a first assessment of stock structure across the species range. The overall divergence among locality samples was very low (overall FST = 0.0004) indicating high connectivity of blackfin tuna across their range. No clear grouping of localities in differentiated units was inferred but structuring followed a weak isolation by distance pattern (r = 0.16, P = 0.032). Pairwise exact tests and spatial analysis of molecular variance suggested divergence of the sample collected offshore Baía Formosa (Brazil) possibly reflecting reproductive isolation of Brazilian populations from those in the Caribbean region and further north. Further study of the status of Brazilian populations and the transition between this region and the Caribbean is warranted. Cryptic subdivision within the Northern Hemisphere part of the range is possible and should be evaluated using increased marker density and a more comprehensive geographic coverage. |
| first_indexed | 2024-04-12T13:33:15Z |
| format | Article |
| id | doaj.art-d8fd449723044387acbd6cd1e61a634c |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-04-12T13:33:15Z |
| publishDate | 2022-06-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-d8fd449723044387acbd6cd1e61a634c2022-12-22T03:31:07ZengNature PortfolioScientific Reports2045-23222022-06-011211910.1038/s41598-022-13857-zPopulation structure of blackfin tuna (Thunnus atlanticus) in the western Atlantic Ocean inferred from microsatellite lociEric A. Saillant0Patricia L. Luque1Emily Short2Luca Antoni3Lionel Reynal4Cedric Pau5Freddy Arocha6Pollyana Roque7Fabio Hazin8School of Ocean Science and Engineering, Gulf Coast Research Laboratory, University of Southern MississippiSchool of Ocean Science and Engineering, Gulf Coast Research Laboratory, University of Southern MississippiSchool of Ocean Science and Engineering, Gulf Coast Research Laboratory, University of Southern MississippiSchool of Ocean Science and Engineering, Gulf Coast Research Laboratory, University of Southern MississippiIFREMER Délégation de MartiniqueIFREMER Délégation de MartiniqueInstituto Oceanográfico de Venezuela, Universidad de OrienteUFRPE-Universidade Federal Rural de PernambucoUFRPE-Universidade Federal Rural de PernambucoAbstract The blackfin tuna, Thunnus atlanticus, is a small tropical tuna exploited by recreational and commercial fisheries in various parts of its range. Information on stock structure is needed to develop management plans for this species but is currently lacking. In this work, 470 blackfin tuna from nine geographic populations were assayed at 13 homologous microsatellite markers to provide a first assessment of stock structure across the species range. The overall divergence among locality samples was very low (overall FST = 0.0004) indicating high connectivity of blackfin tuna across their range. No clear grouping of localities in differentiated units was inferred but structuring followed a weak isolation by distance pattern (r = 0.16, P = 0.032). Pairwise exact tests and spatial analysis of molecular variance suggested divergence of the sample collected offshore Baía Formosa (Brazil) possibly reflecting reproductive isolation of Brazilian populations from those in the Caribbean region and further north. Further study of the status of Brazilian populations and the transition between this region and the Caribbean is warranted. Cryptic subdivision within the Northern Hemisphere part of the range is possible and should be evaluated using increased marker density and a more comprehensive geographic coverage.https://doi.org/10.1038/s41598-022-13857-z |
| spellingShingle | Eric A. Saillant Patricia L. Luque Emily Short Luca Antoni Lionel Reynal Cedric Pau Freddy Arocha Pollyana Roque Fabio Hazin Population structure of blackfin tuna (Thunnus atlanticus) in the western Atlantic Ocean inferred from microsatellite loci Scientific Reports |
| title | Population structure of blackfin tuna (Thunnus atlanticus) in the western Atlantic Ocean inferred from microsatellite loci |
| title_full | Population structure of blackfin tuna (Thunnus atlanticus) in the western Atlantic Ocean inferred from microsatellite loci |
| title_fullStr | Population structure of blackfin tuna (Thunnus atlanticus) in the western Atlantic Ocean inferred from microsatellite loci |
| title_full_unstemmed | Population structure of blackfin tuna (Thunnus atlanticus) in the western Atlantic Ocean inferred from microsatellite loci |
| title_short | Population structure of blackfin tuna (Thunnus atlanticus) in the western Atlantic Ocean inferred from microsatellite loci |
| title_sort | population structure of blackfin tuna thunnus atlanticus in the western atlantic ocean inferred from microsatellite loci |
| url | https://doi.org/10.1038/s41598-022-13857-z |
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