Evolutionary biogeography of the reef-building coral genus Galaxea across the Indo-Pacific ocean.

Autor: Wepfer PH; Marine Biophysics Unit, Okinawa Institute of Science and Technology, 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan; Biodiversity and Biocomplexity Unit, Okinawa Institute of Science and Technology, 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan. Electronic address: patwepfer@gmail.com., Nakajima Y; Marine Biophysics Unit, Okinawa Institute of Science and Technology, 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan., Sutthacheep M; Marine Biodiversity Research Group, Department of Biology, Faculty of Science, Ramkhamhaeng Unuversity, Huamark, Bangkok 10240, Thailand., Radice VZ; The University of Queensland, Australian Research Council Centre of Excellence for Coral Reef Studies, School of Biological Sciences, St. Lucia, QLD 4072, Australia., Richards Z; Trace and Environmental DNA Laboratory, School of Molecular and Life Science, Curtin University, Bentley, Western Australia 6102, Australia; Aquatic Zoology Department, Western Australian Museum, Welshpool, Welstern Australia 6106, Australia., Ang P; Marine Science Laboratory, Chinese University of Hong Kong, Shatin, NT, Hong Kong Special Administrative Region., Terraneo T; Red Sea Research Center, Division of Biological and Environmental Science and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia; ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville 4811, QLD, Australia., Sudek M; Coral Reef Advisory Group, Department of Marine and Wildlife Resources, Fatago 96799, American Samoa., Fujimura A; University of Guam Marine Laboratory, UOG Station, Mangilao, GU 96923, USA., Toonen RJ; Hawai'i Institute of Marine Biology, University of Hawai'i at Mānoa, 46-007 Lilipuna Road, Kāne'ohe, HI 96744, USA., Mikheyev AS; Ecology and Evolution Unit, Okinawa Institute of Science and Technology, 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan., Economo EP; Biodiversity and Biocomplexity Unit, Okinawa Institute of Science and Technology, 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan., Mitarai S; Marine Biophysics Unit, Okinawa Institute of Science and Technology, 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan.
Jazyk: angličtina
Zdroj: Molecular phylogenetics and evolution [Mol Phylogenet Evol] 2020 Oct; Vol. 151, pp. 106905. Date of Electronic Publication: 2020 Jul 09.
DOI: 10.1016/j.ympev.2020.106905
Abstrakt: Stony corals (Scleractinia) form the basis for some of the most diverse ecosytems on Earth, but we have much to learn about their evolutionary history and systematic relationships. In order to improve our understanding of species in corals we here investigated phylogenetic relationships between morphologically defined species and genetic lineages in the genus Galaxea (Euphyllidae) using a combined phylogenomic and phylogeographic approach. Previous studies revealed the nominal species G. fascicularis included three genetically well-differentiated lineages (L, S & L+) in the western Pacific, but their distribution and relationship to other species in the genus was unknown. Based on genomic (RAD-seq) and mitochondrial sequence data (non-coding region between cytb and ND2) we investigated whether the morphological taxa represent genetically coherent entities and what is the phylogenetic relationship and spatial distribution of the three lineages of G. fascicularis throughout the observed species range. Using the RAD-seq data, we find that the genus Galaxea is monophyletic and contains three distinct clades: an Indo-Pacific, a Pacific, and a small clade restricted to the Chagos Archipelago. The three lineages of G. fascicularis were associated with different RAD-seq clades, with the 'L' lineage showing some morphological distinction from the other two lineages (larger more asymmetrical polyps). In addition to these, three more genetic lineages in G. fascicularis may be distinguished - a Chagossian, an Ogasawaran, and one from the Indian-Red Sea. Among nominal taxa for which we have multiple samples, G. horrescens was the only monophyletic species. The mitochondrial non-coding region is highly conserved apart of the length polymorphism used to define L, S & L+ lineages and lacks the power to distinguish morphological and genetic groups resolved with genomic RAD-sequencing. The polyphyletic nature of most species warrants a careful examination of the accepted taxonomy of this group with voucher collections and their comparison to type specimens to resolve species boundaries. Further insight to the speciation process in corals will require international cooperation for the sharing of specimens to facilitate scientific discovery.
(Copyright © 2020 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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