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

Wepfer, Patricia H.; Nakajima, Yuichi; Sutthacheep, Makamas; Radice, Veronica Z.; Richards, Zoe T.; Ang, Put O.; Terraneo, Tullia Isotta; Sudek, Mareike; Fujimura, Atsushi; Toonen, Robert J.; Mikheyev, Alexander S.; Economo, Evan P.; Mitarai, Satoshi

doi:10.1016/j.ympev.2020.106905

Cited by 29 publications

(34 citation statements)

References 74 publications

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“…and H. hiberniana, due to the physical division between the Indian and Pacific Oceans caused by past tectonic and climatic changes. Morphological and molecular analyses on other Indo-Pacific reef-building coral species also found sibling species between the Indian and Pacific Oceans (Veron, 1995;van Oppen et al, 2001;Pinzón et al, 2013;Huang et al, 2014;Arrigoni et al, 2020;Wepfer et al, 2020).…”

Section: Phylogeography and Speciation Patterns Of Helioporamentioning

confidence: 98%

“…It is likely that genetic connectivity has been restricted between Guam and Japan-Taiwan since the Guam subclade (coe.1) diverged from the other two subclades early in the history of H. coerulea. This is unusual because genetic connectivity between Mariana Islands region including Guam and the Kuroshio Current region is often strong in most of the marine invertebrate species with larval dispersal period (e.g., Palumbi et al, 1997;Williams and Benzie, 1998;Lessios et al, 2001;Pinzón et al, 2013;Arrigoni et al, 2020;Wepfer et al, 2020; but see exception in Wörheide et al, 2008). Although the reasons for the genetic break between Guam and Kuroshio Current region in Heliopora spp.…”

Section: Subclades Within Each Heliopora Groupmentioning

confidence: 99%

“…(Taninaka et al, 2019) and/or local adaptation of each subclade. On the other hand, northwestern Australian populations of other marine species are genetically more similar to west Pacific populations than other Indian Ocean populations (e.g., Williams and Benzie, 1998;Lessios et al, 2001;Pinzón et al, 2013;Arrigoni et al, 2020;Wepfer et al, 2020) but contrary examples also exist where Indian and Pacific Ocean coral populations are divergent (e.g., Richards et al, 2016). Williams and Benzie (1998) discussed that this might be due to Western Australia being recently colonized by recruits from the Western Pacific lineage after the end of the last ice age.…”

Section: Subclades Within Each Heliopora Groupmentioning

confidence: 99%

“…Williams and Benzie (1998) discussed that this might be due to Western Australia being recently colonized by recruits from the Western Pacific lineage after the end of the last ice age. Recent genome-wide phylogeographic analysis of reef-building corals have also found such large discrepancies between geographic and genetic distances (Arrigoni et al, 2020;Wepfer et al, 2020), which need to be examined in closer detail in the future.…”

Section: Subclades Within Each Heliopora Groupmentioning

confidence: 99%

“…However, MIG-seq has several advantages, since the method can be performed with small amounts and/or low-quality DNA and is relatively easy and cheap. Indeed, MIG-seq successfully revealed species boundaries of octocoral species that could be undetectable by traditional genetic markers (Richards et al, 2018;Takata et al, 2019).While some studies examined genetic relationships of closely related reef-building corals using HTS techniques in geographically restricted regions (e.g., Forsman et al, 2017;Johnston et al, 2017), only a few studies have analyzed speciation and/or genetic divergence patterns covering the Indo-Pacific scale (but see Warner et al, 2015;Nakajima et al, 2017;Arrigoni et al, 2020;Wepfer et al, 2020). For a more comprehensive picture of the phylogeographic structure of coral species in the Indo-Pacific, and to understand the species diversity of corals, it is necessary to obtain more extensive representation of species across their geographic range.…”

Section: Introductionmentioning

confidence: 99%

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Phylogeography of Blue Corals (Genus Heliopora) Across the Indo-West Pacific

et al. 2021

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Species delimitation of corals is one of the most challenging issues in coral reef ecology and conservation. Morphology can obscure evolutionary relationships, and molecular datasets are consistently revealing greater within-species diversity than currently understood. Most phylogenetic studies, however, have examined narrow geographic areas and phylogeographic expansion is required to obtain more robust interpretations of within- and among- species relationships. In the case of the blue coral Heliopora, there are currently two valid species (H. coerulea and H. hiberniana) as evidenced by integrated genetic and morphological analyses in northwestern Australia. There are also two distinct genetic lineages of H. coerulea in the Kuroshio Current region that are morphologically and reproductively different from each other. Sampling from all Heliopora spp. across the Indo-Pacific is essential to obtain a more complete picture of phylogeographic patterns. To examine phylogenetic relationships within the genus Heliopora, we applied Multiplexed inter simple sequence repeat (ISSR) Genotyping by sequencing (MIG-seq) on > 1287 colonies across the Indo-West Pacific. Maximum likelihood phylogenetic trees indicated the examined Heliopora samples comprise three genetically distinct groups: H. coerulea group, H. hiberniana group, and a new undescribed Heliopora sp. group with further subdivisions within each group. Geographic structuring is evident among the three species with H. hiberniana group found in the Indo-Malay Archipelago and biased toward the Indian Ocean whilst Heliopora sp. was only found in the Kuroshio Current region and Singapore, indicating that this taxon is distributed in the western Pacific and the Indo-Malay Archipelago. Heliopora coerulea has a wider distribution, being across the Indian Ocean and western Pacific. This study highlights the effectiveness of phylogenetic analysis using genome-wide markers and the importance of examining populations across their distribution range to understand localized genetic structure and speciation patterns of corals.

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