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Marine Ecology Progress Series

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MEPS 455:269-285 (2012)  -  DOI: https://doi.org/10.3354/meps09617

From endemism to widespread distribution: phylogeography of three amphidromous Sicyopterus species (Teleostei: Gobioidei: Sicydiinae)

C. Lord1,2,*, J. Lorion3, A. Dettai4, S. Watanabe1, K. Tsukamoto1, C. Cruaud5, P. Keith

1Atmosphere and Ocean Research Institute, The University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa, Chiba 277-8564, Japan
2Muséum National d’Histoire Naturelle, DMPA, UMR 7208, Ichtyologie, CP 26, 57 rue Cuvier, 75231 Paris cedex 05, France
3Marine Ecosystems Research Department - Japan Agency for Marine-Earth Science and Technology (JAMSTEC),
2-15 Natsushima, Yokosuka 237-0061, Japan
4Muséum National d’Histoire Naturelle, Systématique et Evolution, UMR 7138, Service de Systématique Moléculaire, CP 26,
57 rue Cuvier, 75231 Paris cedex 05, France
5Genoscope, Centre National de Séquençage, 2, rue Gaston Crémieux, CP5706, 91057 Evry cedex, France

ABSTRACT: Island freshwater habitats are colonised by amphidromous fish, which display an oceanic larval phase while the rest of their life cycle takes place in rivers. In the present study we evaluated the population structure of the widespread Sicyopterus lagocephalus (Gobioidei) over its Indo-Pacific distribution range, which encompasses the island chain (Indonesia − Papua New Guinea − Malaysia) known as the Indo-Pacific Barrier (IPB). Additional analysis of 2 endemic species, S. aiensis (Vanuatu) and S. sarasini (New Caledonia), living in sympatry with S. lagocephalus, represented comparative material and was used as the basis for an assessment of  endemism and dispersal. Mitochondrial cytochrome b sequence data were obtained for 332 S. lagocephalus, 210 S. aiensis and 87 S. sarasini across each species’ range. Haplotype networks and F-statistics were used to determine patterns of population structure. A discrete phylogeographic diffusion model under a time-scaled coalescent tree prior was used to assess the history of the spatial expansion of S. lagocephalus across its wide spatial distribution. S. lagocephalus demonstrates high population structure across the IPB. It also displays a strong structure between Tahiti and all other locations sampled. No other population structure was identified in the entire western Pacific. Phylogenetic reconstruction and coalescence analysis indicate that the oldest population originated in the western Pacific, from which the eastern Pacific and the Indian Oceans were colonised. For the 2 endemic species, no genetic structure was identified across their respective ranges. From the genetic results associated with known elements of the life history of these species, we improved our understanding of the simultaneous existence of geographically close  endemic species and a widespread species.


KEY WORDS: Sicyopterus · Amphidromy · Pelagic larval duration · Biogeographical barrier · Endemism · Indo-Pacific · Cytochrome b · Population structure


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Cite this article as: Lord C, Lorion J, Dettai A, Watanabe S, Tsukamoto K, Cruaud C, Keith P (2012) From endemism to widespread distribution: phylogeography of three amphidromous Sicyopterus species (Teleostei: Gobioidei: Sicydiinae). Mar Ecol Prog Ser 455:269-285. https://doi.org/10.3354/meps09617

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