Volume 43, Issue 6 pp. 1116-1129
Original Article

Phylogeography, population structure and evolution of coral-eating butterflyfishes (Family Chaetodontidae, genus Chaetodon, subgenus Corallochaetodon)

Ellen Waldrop

Ellen Waldrop

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

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Jean-Paul A. Hobbs

Jean-Paul A. Hobbs

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

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John E. Randall

John E. Randall

Bishop Museum, Honolulu, HI, 96817 USA

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Joseph D. DiBattista

Joseph D. DiBattista

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

Red Sea Research Center, Division of Biological and Environmental Science and Engineering, King Abdullah University of Science and Technology, Thuwal, 23955 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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Randall K. Kosaki

Randall K. Kosaki

NOAA/Daniel K. Inouye Regional Center, Papahānaumokuākea Marine National Monument, Honolulu, HI, 96818 USA

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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, Thuwal, 23955 Saudi Arabia

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Brian W. Bowen

Corresponding Author

Brian W. Bowen

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

Correspondence: Brian W. Bowen, Hawai'i Institute of Marine Biology, P.O. Box 1346, Kane'ohe, HI 96744, USA.

E-mail: [email protected]

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First published: 11 January 2016
Citations: 32
Editor: Michelle Gaither

Abstract

Aim

This study compares the phylogeography, population structure and evolution of four butterflyfish species in the Chaetodon subgenus Corallochaetodon, with two widespread species (Indian Ocean – C. trifasciatus and Pacific Ocean – C. lunulatus), and two species that are largely restricted to the Red Sea (C. austriacus) and north-western (NW) Indian Ocean (C. melapterus). Through extensive geographical coverage of these taxa, we seek to resolve patterns of genetic diversity within and between closely related butterflyfish species in order to illuminate biogeographical and evolutionary processes.

Location

Red Sea, Indian Ocean and Pacific Ocean.

Methods

A total of 632 individuals from 24 locations throughout the geographical ranges of all four members of the subgenus Corallochaetodon were sequenced using a 605 bp fragment (cytochrome b) of mtDNA. In addition, 10 microsatellite loci were used to assess population structure in the two widespread species.

Results

Phylogenetic reconstruction indicates that the Pacific Ocean C. lunulatus diverged from the Indian Ocean C. trifasciatus approximately 3 Ma, while C. melapterus and C. austriacus comprise a cluster of shared haplotypes derived from C. trifasciatus within the last 0.75 Myr. The Pacific C. lunulatus had significant population structure at peripheral locations on the eastern edge of its range (French Polynesia, Johnston Atoll, Hawai'i), and a strong break between two ecoregions of the Hawaiian Archipelago. The Indian Ocean C. trifasciatus showed significant structure only at the Chagos Archipelago in the central Indian Ocean, and the two range-restricted species showed no population structure but evidence of recent population expansion.

Main conclusions

Patterns of endemism and genetic diversity in Corallochaetodon butterflyfishes have been shaped by (1) Plio-Pleistocene sea level changes that facilitated evolutionary divergences at biogeographical barriers between Indian and Pacific Oceans, and the Indian Ocean and Red Sea, and (2) semi-permeable oceanographic and ecological barriers working on a shorter time-scale. The evolution of range-restricted species (Red Sea and NW Indian Ocean) and isolated populations (Hawai'i) at peripheral biogeographical provinces indicates that these areas are evolutionary incubators for reef fishes.

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