A bridge too far: Dispersal barriers and cryptic speciation in an Arabian Peninsula grouper (Cephalopholis hemistiktos)

Priest, Mark A., Dibattista, Joseph D., Mcilwain, Jennifer L., Taylor, Brett, Hussey, Nigel E., and Berumen, Michael L. (2016) A bridge too far: Dispersal barriers and cryptic speciation in an Arabian Peninsula grouper (Cephalopholis hemistiktos). Journal of Biogeography, 43 (4). pp. 820-832.

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Aim: We use genetic and age-based analyses to assess the evidence for a biogeographical barrier to larval dispersal in the yellowfin hind, Cephalopholis hemistiktos, a commercially important species found across the Arabian Peninsula.

Location: Red Sea, Gulf of Aden, Gulf of Oman and Arabian Gulf.

Methods: Mitochondrial DNA cytochrome-c oxidase subunit-I and nuclear DNA (S7) sequences were obtained for C. hemistiktos sampled throughout its distributional range. Phylogeographical and population-level analyses were used to assess patterns of genetic structure and to identify barriers to dispersal. Concurrently, age-based demographic analyses using otoliths determined differences in growth and longevity between regions.

Results: Our analyses revealed significant genetic structure congruent with growth parameter differences observed across sampling sites, suggesting cryptic speciation between populations in the Red Sea and Gulf of Aden versus the Gulf of Oman and Arabian Gulf. Coalescence analyses indicated these two regions have been isolated for > 800,000 years.

Main conclusions: Our results indicate historical disruption to gene flow and a contemporary dispersal barrier in the Arabian Sea, which C. hemistiktos larvae are unable to effectively traverse. This provides yet another example of a (cryptic) species with high dispersive potential whose range is delimited by a lack of suitable habitat between locations or an inability to successfully recruit at the range edge.

Item ID: 49278
Item Type: Article (Research - C1)
ISSN: 1365-2699
Keywords: coral reef fish, demography, mitochondrial DNA, nuclear DNA, phylogeography, population genetics, serranidae
Funders: King Abdullah University of Science and Technology (KAUST), National Geographic Society (NGS)
Projects and Grants: KAUST CRG-1-2012-BER-002, NGS 9024-11
Date Deposited: 09 Jun 2017 01:51
FoR Codes: 31 BIOLOGICAL SCIENCES > 3109 Zoology > 310903 Animal developmental and reproductive biology @ 100%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8302 Fisheries - Wild Caught > 830204 Wild Caught Fin Fish (excl. Tuna) @ 50%
97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 50%
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