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Phylogeography of the reef fish Cephalopholis argus (Epinephelidae) indicates Pleistocene isolation across the indo-pacific barrier with contemporary overlap in the coral triangle
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BACKGROUND: The Coral Triangle (CT), bounded by the Philippines, the Malay Peninsula, and New Guinea, is the epicenter of marine biodiversity. Hypotheses that explain the source of this rich biodiversity include 1) the center of origin, 2) the center of accumulation, and 3) the region of overlap. Here we contribute to the debate with a phylogeographic survey of a widely distributed reef fish, the Peacock Grouper (Cephalopholis argus; Epinephelidae) at 21 locations (N = 550) using DNA sequence data from mtDNA cytochrome b and two nuclear introns (gonadotropin-releasing hormone and S7 ribosomal protein). RESULTS: Population structure was significant (ΦST = 0.297, P < 0.001; FST = 0.078, P < 0.001; FST = 0.099, P < 0.001 for the three loci, respectively) among five regions: French Polynesia, the central-west Pacific (Line Islands to northeastern Australia), Indo-Pacific boundary (Bali and Rowley Shoals), eastern Indian Ocean (Cocos/Keeling and Christmas Island), and western Indian Ocean (Diego Garcia, Oman, and Seychelles). A strong signal of isolation by distance was detected in both mtDNA (r = 0.749, P = 0.001) and the combined nuclear loci (r = 0.715, P < 0.001). We detected evidence of population expansion with migration toward the CT. Two clusters of haplotypes were detected in the mtDNA data (d = 0.008), corresponding to the Pacific and Indian Oceans, with a low level of introgression observed outside a mixing zone at the Pacific-Indian boundary. CONCLUSIONS: We conclude that the Indo-Pacific Barrier, operating during low sea level associated with glaciation, defines the primary phylogeographic pattern in this species. These data support a scenario of isolation on the scale of 105 year glacial cycles, followed by population expansion toward the CT, and overlap of divergent lineages at the Pacific-Indian boundary. This pattern of isolation, divergence, and subsequent overlap likely contributes to species richness at the adjacent CT and is consistent with the region of overlap hypothesis.
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![Figure 2 Median-joining networks for Cephalopholis argus. Networks were constructed using the program NETWORK 4.5 [43] for (a) 550 cytochrome b sequences (b) alleles at GnRH intron from 488 individuals, and (c) alleles at S7 intron for 490 individuals. Each circle represents one mitochondrial haplotype or nuclear allele with the area of each circle proportional to the number of that particular haplotype or allele in the dataset; dashes represent hypothetical haplotypes or alleles; colors represent collection location (see key).](/paper-figures/1bb7df3958b741ab91911747022c0573/phylogeography-of-the-reef-fish-cephalopholis-argus-epinephelidae-indicates-figure-2.jpg)
![Figure 3 Phylogenetic tree of Cephalopholis argus cytochrome b haplotypes. The best maximum likelihood tree generated using program default settings in RAxML [44] and rooted using two congenerics (C. urodeta and C. taeniops). Bootstrap support values were calculated using default settings with 1000 replicates. For comparison neighbor-joining bootstrap values (1000 bootstrap replicates) and Bayesian posterior probabilities are presented. Colored bars delineate the Pacific and Indian Ocean lineages separated by three fixed differences (see figure 1).](/paper-figures/7302624cbcbc407c9811b578d4527b8c/phylogeography-of-the-reef-fish-cephalopholis-argus-epinephelidae-indicates-figure-3.jpg)
![Figure 4 Mismatch distribution for Cephalopholis argus. Mismatch distribution based on 550 cytochrome b sequences from twenty-one populations. The dark colored line represents the observed and light colored line is the simulated pairwise differences as reported by DnaSP 5.0 [39]. The Harpending's raggedness index as calculated in ARLEQUIN 3.5 [42] and corresponding P-value are shown.](/paper-figures/1e257f43fd5449f6aa620cace2703b8b/phylogeography-of-the-reef-fish-cephalopholis-argus-epinephelidae-indicates-figure-4.jpg)
![Figure 5 Migration rates for Cephalopholis argus. Migration rates (Nm: where N is effective female population size and m is migration rate) based on cytochrome b sequences calculated using MIGRATE 3.1.6 [54,55]. Locations with non-significant pairwise ΦST values were grouped (see Table 2). French Polynesia (FP) = Marquesas and Moorea; central-west Pacific (CW) = Kiritimati, Palmyra, Samoa/Tokelau, Baker/Howland, Kwajalein, Pohnpei, Saipan, Palau, Lizard Island, Philippines, and Scott Reef; Indo-Pacific boundary (IB) = Bali and Rowley Shoals; eastern Indian Ocean (EI) = Christmas Island and Cocos/Keeling; western Indian Ocean (WI) = Sumatra, Diego Garcia, Oman, and Seychelles. The direction of migration is indicated. Numbers of migrants per generation between geographic regions are reported with 95% confidence intervals in parentheses.](/paper-figures/762055d5f21e49fca462d3c2af333034/phylogeography-of-the-reef-fish-cephalopholis-argus-epinephelidae-indicates-figure-5.jpg)

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“The geographical range of C. porosus encompasses a well-known phylogeographic boundary, the Indo-Pacific Barrier, that affects many Indo-Pacific species (e.g., gastropods [56]; reef fish [57]).”
From Mitogenomic Crocodylia phylogeny and population structure of Crocodylus porosus including the extinct Seychelles crocodile (2026) · cites this paper as [57]
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Cites
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A realignment of marine biogeographic provinces with particular reference to fish distributions
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Background
Metadata
- Authors
- Gaither, M. R., Bowen, B. W., Bordenave, T.-R., Rocha, L. A., Newman, S. J., Gomez, J. A., van Herwerden, L., & Craig, M. T.
- Affiliations
- University of Hawaii System (US)
- University of Hawaiʻi at Mānoa (US)
- California Academy of Sciences (US)
- Government of Western Australia (AU)
- James Cook University (AU)
- University of Puerto Rico-Mayaguez (PR)
- Corresponding author
- Gaither, Michelle R
- ORCID
- Venue
- BMC Evolutionary Biology
- Published
- 2011-07-01
- Volume
- 11
- Issue
- 1
- Pages
- 189-189
- ISSN
- 1471-2148 (ISSN-L)
- PMC
- PMC3145601
- OpenAlex
- W1989413030
- Cited by
- 191
- References
- 110
- Citations by year
- 2026: 12 · 2025: 12 · 2024: 11 · 2023: 5 · 2022: 11 · 2021: 13 · 2020: 15 · 2019: 9 · 2018: 14 · 2017: 8 · 2016: 16 · 2015: 14 · 2014: 12 · 2013: 17 · 2012: 17
- FWCI
- 9.98
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- BMC Evolutionary Biology (publishedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- ResearchOnline at James Cook University (James Cook University) (submittedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- eSpace (Curtin University) (submittedVersion)
- Funders
- National Science Foundation (2005-008/66882, 0554657, OCE#09‐29031, 8208-07, 0929031, 0453167)
- U.S. Department of Commerce
- National Geographic Society (0453167, 0929031, 8208-07)
- Nature Conservancy
- National Oceanic and Atmospheric Administration (09-29031, 2005-008/66882, OCE-0929031, 0453167, NA09OAR4170060)
- U.S. Fish and Wildlife Service
- Hawai'i Sea Grant, University of Hawai'i (NA09OAR4170060, 2005-008/66882)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic diversity and population structure
- Physical Sciences › Environmental Science › Ecology › Coral and Marine Ecosystems Studies
- Life Sciences › Agricultural and Biological Sciences › Aquatic Science › Fish Biology and Ecology Studies
- Keywords
- Cephalopholis argus, phylogeography, Pleistocene isolation, Coral Triangle, reef fish, population structure, isolation by distance, population growth, introgression, center of origin, Epinephelidae, cytochrome b, nuclear introns
- MeSH terms
- Animals, Bass, DNA, Mitochondrial, Molecular Sequence Data, Pacific Ocean, Phylogeny, Evolution, Molecular, Indian Ocean, Animal Migration, Fish Proteins, Phylogeography
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