Potential for different reproductive timing between sympatric &lt;I&gt;Heliopora coerulea&lt;/I&gt; lineages southeast of Iriomote Island, Japan

Saito, Yuta; Ueno, Mitsuhiro; Kiatano, Yuko F.; Yasuda, Nina

doi:10.5343/bms.2015.1024

Cited by 6 publications

(9 citation statements)

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“…As such, no difficulty was encountered in classifying a colony into either columnar or laminar type. Furthermore, no intermediate morphs were found, contrary to the results of Yasuda et al (2014) and Saito et al (2015) in Japan.…”

Section: Resultscontrasting

confidence: 94%

“…No colony of either growth form was observed to brood in October 2009, approximately a half-year after the brooding observations earlier that year. In situ observation of external brooding in lobate (laminar) but not in columnar colonies has also indicated possible differences in reproductive timing between sympatric H. coerulea lineages in southern Japan (Saito et al 2015). The release of externally brooded larvae observed ex situ in 2009 commenced a few days before the new moon and ended around the first quarter moon, with columnar colonies planulating one lunar cycle earlier than their laminar counterparts (Fig.…”

Section: Resultsmentioning

confidence: 91%

“…In southern Taiwan (22°00' N), these reproductive processes were observed in the laminar clade in April (Liu et al 2005). However, in southern Japan at 24°22' N (Harii and Kayanne 2003) and at 24°17' N (Saito et al 2015), they occurred in the laminar clade in July. Representatives from the tropical region (Philippines and southern Taiwan, below the Tropic of Cancer at 23°26' N) appear to share similar reproductive timing, in contrast to their subtropical counterparts (southern Japan).…”

Section: Resultsmentioning

confidence: 95%

“…To date, there are only four published accounts of the timing of external brooding in the blue coral, three of which pertain to the flat-branched colonies from the northwestern Pacific region. In Wanlitung in southern Taiwan, this reproductive process was observed in April (Liu et al 2005), while it was observed in July at two reef sites in southern Japan, Shiraho Reef in Ishigaki Island (Harii andKayanne 2003, with clade specified in Yasuda et al 2010) and Iriomote Island (Saito et al 2015). In contrast, in the Southern Hemisphere (Holbourne Island, Great Barrier Reef), surface brooding in an unspecified clade was observed in January (Babcock 1990).…”

Section: Introductionmentioning

confidence: 95%

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Cryptic speciation in the stony octocoral Heliopora coerulea: temporal reproductive isolation between two growth forms

Villanueva

2015

Mar Biodiv

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Two growth forms of the stony blue octocoral Heliopora coerulea were recently shown to exhibit different genetic structures. In the present study, the reproductive timing of the two growth forms of the externally brooding blue coral was determined over a period of three years to examine the possible mechanism of cryptic speciation previously indicated by genetic data. During each monitoring year, in situ observations revealed external brooding of larvae in columnar colonies approximately one month earlier than their laminar counterparts. Ex situ larval collection during the first monitoring year showed larval release occurring around new moon to first quarter moon, with columnar colonies planulating in March and laminar colonies in April. These results indicate temporal reproductive isolation between the two growth forms, hence supporting the existence of cryptic species in the blue octocoral.

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Section: Resultscontrasting

confidence: 94%

Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 95%

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Cryptic speciation in the stony octocoral Heliopora coerulea: temporal reproductive isolation between two growth forms

Villanueva

2015

Mar Biodiv

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“…hiberniana sp. nov. and lineages HC-A and HC-B reported in 18 , 19 . By expanding both the breadth of populations sampled and the extent of genome sampled, we will improve our ability to understand phylogeny and character evolution in this important genus of reef-building corals.…”

Section: Discussionmentioning

confidence: 93%

Integrated evidence reveals a new species in the ancient blue coral genus Heliopora (Octocorallia)

Richards

Yasuda

Kikuchi

et al. 2018

Sci Rep

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Maintaining the accretion potential and three dimensional structure of coral reefs is a priority but reef-building scleractinian corals are highly threatened and retreating. Hence future reefs are predicted to be dominated by non-constructional taxa. Since the Late Triassic however, other non-scleractinian anthozoans such as Heliopora have contributed to tropical and subtropical reef-building. Heliopora is an ancient and highly conserved reef building octocoral genus within the monospecific Family Helioporidae, represented by a single extant species – H. coerulea, Pallas, 1766. Here we show integrated morphological, genomic and reproductive evidence to substantiate the existence of a second species within the genus Heliopora. Importantly, some individuals of the new species herein described as Heliopora hiberniana sp. nov. feature a white skeleton indicating that the most diagnostic and conserved Heliopora character (the blue skeleton) can be displaced. The new species is currently known only from offshore areas in north Western Australia, which is a part of the world where coral bleaching events have severely impacted the scleractinian community over the last two decades. Field observations indicate individuals of both H. coerulea and H. hiberniana sp. nov. were intact after the 2016 Scott Reef thermal stress event, and we discuss the possibility that bleaching resistant non-scleractinian reef builders such as Heliopora could provide new ecological opportunities for the reconfiguration of future reefs by filling empty niches and functional roles left open by the regression of scleractinian corals.

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Genetic diversity, paraphyly and incomplete lineage sorting of mtDNA, ITS2 and microsatellite flanking region in closely related Heliopora species (Octocorallia)

Yasuda

Taquet

Nagai

et al. 2015

Molecular Phylogenetics and Evolution

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Examining genetic diversity and lineage sorting of different genes in closely related species provide useful information for phylogenetic analyses and ultimately for understanding the origins of biodiversity. In this study, we examined inter- and intraspecific genetic variation in internal transcribed spacer 2 (ITS2), partial mitochondrial gene (mtMutS), and nuclear microsatellite flanking region in two closely related octocoral species (Heliopora coerulea, HC-A and HC-B). These species were recently identified in a population genetic study using microsatellite markers. The two species have different reproductive timing, which ecologically promotes lineage sorting. In this study, we examined whether species boundaries could be detected by the commonly used nuclear ITS2 and mtMutS, as well as by possibly neutral microsatellite flanking sequences. Haplotype network analysis of microsatellite flanking region revealed that a possible ancestral haplotype was still shared between the two species, indicating on-going lineage sorting. Haplotype network analysis of ITS2 and microsatellite flanking region revealed shared haplotypes between the two lineages. The two species shared fewer ITS2 sequences than microsatellite flanking region sequences. The almost fixed point mutation at the tip of helix 3 of ITS2 was not associated with the secondary structure or compensatory base changes (CBCs). The phylogenetic tree of ITS2 showed paraphyly and that of the microsatellite flanking region indicated that lineage sorting for the two species may be incomplete. Much higher intra- and inter-individual variation of ITS2 was observed in HC-B than that in HC-A, highlighting the importance of examining ITS2 from multiple individuals to estimate genetic diversity. The mitochondrial mtMutS gene sequences from 39 individuals, including both species collected from Japan and Taiwan, showed no variation because of slow rates of mitochondrial nucleotide substitution. This study suggests caution is warranted when reciprocal monophyly in a phylogenetic tree is used as the criterion for delimiting closely related octocoral species based on ITS2 or mtMtuS sequences. Detection of boundaries between closely related species requires multi-locus analysis, such as genetic admixture analysis using multiple individuals.

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Potential for different reproductive timing between sympatric <I>Heliopora coerulea</I> lineages southeast of Iriomote Island, Japan

Cited by 6 publications

References 0 publications

Cryptic speciation in the stony octocoral Heliopora coerulea: temporal reproductive isolation between two growth forms

Cryptic speciation in the stony octocoral Heliopora coerulea: temporal reproductive isolation between two growth forms

Integrated evidence reveals a new species in the ancient blue coral genus Heliopora (Octocorallia)

Genetic diversity, paraphyly and incomplete lineage sorting of mtDNA, ITS2 and microsatellite flanking region in closely related Heliopora species (Octocorallia)

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