Hybridization between sympatric hammerhead sharks in the western North Atlantic Ocean

Barker, Amanda M.; Adams, Douglas H.; Driggers, William B.; Frazier, Bryan S.; Portnoy, David S.

doi:10.1098/rsbl.2019.0004

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i

Hybridization between sympatric hammerhead sharks in the western North Atlantic Ocean

2019
By Barker, Amanda M. ; Adams, Douglas H. ; Driggers, William B. ; ...
Source: Biol Lett. 2019 Apr 26;15(4):20190004.

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Details:

Journal Title:

Biology Letters
Personal Author:

Barker, Amanda M. ; Adams, Douglas H. ; Driggers, William B. ; Frazier, Bryan S. ; Portnoy, David S.

Barker, Amanda M. ; Adams, Douglas H. ; Driggers, William B. ; Frazier, Bryan S. ; Portnoy, David S. Less -
NOAA Program & Office:

NMFS (National Marine Fisheries Service) ; SEFSC (Southeast Fisheries Science Center)

NMFS (National Marine Fisheries Service) ; SEFSC (Southeast Fisheries Science Center) Less -
Description:

Hybridization between closely related species has been documented across a wide range of taxa but has not been well studied in elasmobranchs. Hammerhead sharks have drawn global conservation concern because they experience some of the highest mortality rates among sharks when interacting with fisheries. Here we report on the detection of hybrids between the globally distributed scalloped hammerhead ( Sphyrna lewini) and recently described Carolina hammerhead ( S. gilberti) which are only known from the western Atlantic Ocean. Using a genomics approach, 10 first-generation hybrids and 15-17 backcrosses were detected from 554 individuals. The identification of backcrosses demonstrates hybrids are viable, and all backcrosses but one involved a scalloped hammerhead. All hybrids but one possessed Carolina hammerhead mtDNA, indicating sex-biased gene flow between species. Repeated hybridization and backcrossing with scalloped hammerheads could lead to the loss of endemic Carolina hammerheads.
Keywords:

[+]

Hammerhead Sharks Hybridization
Source:

Biol Lett. 2019 Apr 26;15(4):20190004.
DOI:

https://doi.org/10.1098/rsbl.2019.0004
Pubmed ID:

30940019
Pubmed Central ID:

PMC6501367
Document Type:

Journal Article
Funding:

Grant no. NA14NMF4540063
Place as Subject:

Atlantic Ocean
Rights Information:

Other
Compliance:

PMC
Main Document Checksum:

[+]

urn:sha256:b4c3284e2c4d54c9db5f6756787f796e1449a0c21b3a888f361c65aab5d32da8
Download URL:

https://repository.library.noaa.gov/view/noaa/26249/noaa_26249_DS1.pdf
File Type:

[PDF-428.16 KB]

Reference data

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