Evidence for gene flow from the Gulf of Mexico to the Atlantic Ocean in bonnethead sharks (Sphyrna tiburo).
| Title: | Evidence for gene flow from the Gulf of Mexico to the Atlantic Ocean in bonnethead sharks (Sphyrna tiburo). |
|---|---|
| Authors: | Black, Kristina L.1 (AUTHOR) kblack@utexas.edu, Liu, Kathy2 (AUTHOR), Graham, Jasmin R.3 (AUTHOR), Wiley, Tonya R.4 (AUTHOR), Gardiner, Jayne M.5 (AUTHOR), Macdonald, Catherine2,6 (AUTHOR), Matz, Mikhail V.1 (AUTHOR) |
| Source: | Ecology & Evolution (20457758). Sep2024, Vol. 14 Issue 9, p1-12. 12p. |
| Subject Terms: | *Ecological disturbances, *Bodies of water, *Seawater, Gene flow, Genetic variation, Larval dispersal, Hammerhead sharks |
| Abstract: | Gene flow is important for maintaining the genetic diversity required for adaptation to environmental disturbances, though gene flow may be limited by site fidelity in small coastal sharks. Bonnethead sharks (Sphyrna tiburo)—a small coastal hammerhead species—demonstrate site fidelity, as females are philopatric while males migrate to mediate gene flow. Consequently, bonnetheads demonstrate population divergence with distance, and Atlantic populations are genetically distinct from those of the Gulf of Mexico. Indeed, Florida forms a vicariant zone between these two bodies of water for many marine species, including some sharks. However, while bonnetheads are expected to have limited dispersal, the extent and rate of bonnethead migration remain uncertain. Thus, we aimed to determine their dispersal capacity by evaluating connectivity between disparate populations from the Gulf of Mexico and Atlantic Ocean. Using 10,733 SNPs derived from 2bRAD sequences, we evaluated genetic connectivity between Tampa Bay on the Gulf Coast of Florida and Biscayne Bay on the Atlantic coast of Florida. While standard analyses of genetic structure revealed slight but significant differentiation between Tampa Bay and Biscayne Bay populations, demographic history inference based on the site frequency spectrum favored a model without divergence. However, we also estimate that if population divergence occurred, it would have been recent (between 1500 and 4500 years ago), with continuous unidirectional gene flow from Tampa Bay to Biscayne Bay. Our findings support the hypothesis that bonnetheads can migrate over relatively large distances (>300 miles) to find mates. Together, these results provide optimism that under proper management, a small‐bodied globally endangered shark can undergo long migrations to sustain genetic diversity. [ABSTRACT FROM AUTHOR] |
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| Items | – Name: Title Label: Title Group: Ti Data: Evidence for gene flow from the Gulf of Mexico to the Atlantic Ocean in bonnethead sharks (Sphyrna tiburo). – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Black%2C+Kristina+L%2E%22">Black, Kristina L.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> kblack@utexas.edu</i><br /><searchLink fieldCode="AR" term="%22Liu%2C+Kathy%22">Liu, Kathy</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Graham%2C+Jasmin+R%2E%22">Graham, Jasmin R.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wiley%2C+Tonya+R%2E%22">Wiley, Tonya R.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gardiner%2C+Jayne+M%2E%22">Gardiner, Jayne M.</searchLink><relatesTo>5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Macdonald%2C+Catherine%22">Macdonald, Catherine</searchLink><relatesTo>2,6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Matz%2C+Mikhail+V%2E%22">Matz, Mikhail V.</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Ecology+%26+Evolution+%2820457758%29%22">Ecology & Evolution (20457758)</searchLink>. Sep2024, Vol. 14 Issue 9, p1-12. 12p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Ecological+disturbances%22">Ecological disturbances</searchLink><br />*<searchLink fieldCode="DE" term="%22Bodies+of+water%22">Bodies of water</searchLink><br />*<searchLink fieldCode="DE" term="%22Seawater%22">Seawater</searchLink><br /><searchLink fieldCode="DE" term="%22Gene+flow%22">Gene flow</searchLink><br /><searchLink fieldCode="DE" term="%22Genetic+variation%22">Genetic variation</searchLink><br /><searchLink fieldCode="DE" term="%22Larval+dispersal%22">Larval dispersal</searchLink><br /><searchLink fieldCode="DE" term="%22Hammerhead+sharks%22">Hammerhead sharks</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Gene flow is important for maintaining the genetic diversity required for adaptation to environmental disturbances, though gene flow may be limited by site fidelity in small coastal sharks. Bonnethead sharks (Sphyrna tiburo)—a small coastal hammerhead species—demonstrate site fidelity, as females are philopatric while males migrate to mediate gene flow. Consequently, bonnetheads demonstrate population divergence with distance, and Atlantic populations are genetically distinct from those of the Gulf of Mexico. Indeed, Florida forms a vicariant zone between these two bodies of water for many marine species, including some sharks. However, while bonnetheads are expected to have limited dispersal, the extent and rate of bonnethead migration remain uncertain. Thus, we aimed to determine their dispersal capacity by evaluating connectivity between disparate populations from the Gulf of Mexico and Atlantic Ocean. Using 10,733 SNPs derived from 2bRAD sequences, we evaluated genetic connectivity between Tampa Bay on the Gulf Coast of Florida and Biscayne Bay on the Atlantic coast of Florida. While standard analyses of genetic structure revealed slight but significant differentiation between Tampa Bay and Biscayne Bay populations, demographic history inference based on the site frequency spectrum favored a model without divergence. However, we also estimate that if population divergence occurred, it would have been recent (between 1500 and 4500 years ago), with continuous unidirectional gene flow from Tampa Bay to Biscayne Bay. Our findings support the hypothesis that bonnetheads can migrate over relatively large distances (>300 miles) to find mates. Together, these results provide optimism that under proper management, a small‐bodied globally endangered shark can undergo long migrations to sustain genetic diversity. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Ecology & Evolution (20457758) is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1002/ece3.70334 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 12 StartPage: 1 Subjects: – SubjectFull: Ecological disturbances Type: general – SubjectFull: Bodies of water Type: general – SubjectFull: Seawater Type: general – SubjectFull: Gene flow Type: general – SubjectFull: Genetic variation Type: general – SubjectFull: Larval dispersal Type: general – SubjectFull: Hammerhead sharks Type: general Titles: – TitleFull: Evidence for gene flow from the Gulf of Mexico to the Atlantic Ocean in bonnethead sharks (Sphyrna tiburo). Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Black, Kristina L. – PersonEntity: Name: NameFull: Liu, Kathy – PersonEntity: Name: NameFull: Graham, Jasmin R. – PersonEntity: Name: NameFull: Wiley, Tonya R. – PersonEntity: Name: NameFull: Gardiner, Jayne M. – PersonEntity: Name: NameFull: Macdonald, Catherine – PersonEntity: Name: NameFull: Matz, Mikhail V. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 09 Text: Sep2024 Type: published Y: 2024 Identifiers: – Type: issn-print Value: 20457758 Numbering: – Type: volume Value: 14 – Type: issue Value: 9 Titles: – TitleFull: Ecology & Evolution (20457758) Type: main |
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