Volume 43, Issue 6 pp. 1103-1115
Original Article

Phylogeography of Indo-Pacific reef fishes: sister wrasses Coris gaimard and C. cuvieri in the Red Sea, Indian Ocean and Pacific Ocean

Pauliina A. Ahti

Corresponding Author

Pauliina A. Ahti

Hawai'i Institute of Marine Biology, University of Hawai'i, Kāne'ohe, HI, 96744 USA

School of Life Sciences, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, G12 8QQ UK

Correspondence: Pauliina A. Ahti, School of Life Sciences, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow G12 8QQ, UK.

E-mail: [email protected]

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Richard R. Coleman

Richard R. Coleman

Hawai'i Institute of Marine Biology, University of Hawai'i, Kāne'ohe, HI, 96744 USA

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Joseph D. DiBattista

Joseph D. DiBattista

Red Sea Research Center, Division of Biological and Environmental Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900 Saudi Arabia

Department of Environment and Agriculture, Curtin University, PO Box U1987, Perth, WA, 6845 Australia

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Michael L. Berumen

Michael L. Berumen

Red Sea Research Center, Division of Biological and Environmental Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900 Saudi Arabia

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Luiz A. Rocha

Luiz A. Rocha

Section of Ichthyology, California Academy of Sciences, San Francisco, CA, 94118 USA

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Brian W. Bowen

Brian W. Bowen

Hawai'i Institute of Marine Biology, University of Hawai'i, Kāne'ohe, HI, 96744 USA

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First published: 01 February 2016
Citations: 24
Editor: Michelle Gaither

Abstract

Aim

The aim of this study was to resolve the evolutionary history, biogeographical barriers and population histories for sister species of wrasses, the African Coris (Coris cuvieri) in the Indian Ocean and Red Sea, and the Yellowtail Coris (Coris gaimard) in the Pacific Ocean. Glacial sea level fluctuations during the Pleistocene have shaped the evolutionary trajectories of Indo-Pacific marine fauna, primarily by creating barriers between the Red Sea, Indian Ocean and Pacific Ocean. Here, we evaluate the influence of these episodic glacial barriers on sister species C. cuvieri and C. gaimard.

Location

Red Sea, Indian Ocean, Pacific Ocean.

Methods

Sequences from mitochondrial DNA cytochrome oxidase c subunit I (COI), and nuclear introns gonadotropin-releasing hormone (GnRH) and ribosomal S7 protein were analysed in 426 individuals from across the range of both species. Median-joining networks, analysis of molecular variance and Bayesian estimates of the time since most recent common ancestor were used to resolve recent population history and connectivity.

Results

Cytochrome oxidase c subunit I haplotypes showed a divergence of 0.97% between species, and nuclear alleles were shared between species. No population structure was detected between the Indian Ocean and Red Sea. The strongest signal of population structure was in C. gaimard between the Hawaiian biogeographical province and other Pacific locations (COI ϕST = 0.040–0.173, < 0.006; S7 ϕST = 0.046, < 0.001; GnRH ϕST = 0.022, < 0.005). Time to most recent common ancestor is c. 2.12 Ma for C. cuvieri and 1.76 Ma for C. gaimard.

Main conclusions

We demonstrate an Indian-Pacific divergence of < 2 Myr and high contemporary gene flow between the Red Sea and Indian Ocean, mediated in part by the long pelagic larval stage. The discovery of hybrids at Christmas Island indicates that Indian and Pacific lineages have come into secondary contact after allopatric isolation. Subspecies status may be appropriate for these two wrasses.

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