論文 - Reimer James Davis

The stoloniferous octocoral, Hanabira yukibana, gen. nov., sp. nov., of the southern Ryukyus has morphological and symbiont variation

Lau Y, FR Stokvis, Y Imahara, JD Reimer

Contributions to Zoology ( Contributions to Zoology )  88 ( 1 ) 54 - 77   2019年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

Stoloniferan octocorals (Cnidaria: Anthozoa: Octocorallia: Alcyonacea) are a relatively unexplored fauna in the Ryukyus (southern Japan), known to be a tropical marine region of high biodiversity and endemism of species. Specimens of stoloniferous octocorals were collected during fieldwork along the coasts of two islands (Okinawa and Iriomote) in the Okinawa Prefecture. Despite their phenotypic polyp variation, this study shows their morphological and molecular uniqueness, leading to the description of a new genus with a single species: <italic>Hanabira yukibana,</italic> gen. nov., sp. nov. They are placed within the Clavulariidae and form a sister clade basally to the genus <italic>Knopia</italic> Alderslade &amp; McFadden, 2007 and species of <italic>Clavularia</italic> Blainville, 1830. The polyps of this new species show morphological variation in both shape and sclerite density, but there is conformity in the typical overall petal shaped tentacles, which have fused pinnules (pseudopinnules). Depending on the densities of their sclerites and their photosynthetic endosymbiotic algae (zooxanthellae) of the family Symbiodiniaceae, there is a characteristic sheen present in the tentacles. Moreover, the zooxanthellae hosted by our specimens form a clear, small-scale biogeographic pattern; all <italic>H. yukibana</italic> specimens from Okinawa Island contained zooxanthellae of the genus <italic>Cladocopium</italic> Lajeunesse &amp; H.J. Jeong, 2018 (= former <italic>Symbiodinium</italic> ‘Clade C’) and all specimens from Iriomote Island hosted zooxanthellae of the genus <italic>Durusdinium</italic> LaJeunesse, 2018 (= former <italic>Symbiodinium</italic> ‘Clade D’). These results show the potential for variation among the Symbiodiniaceae floras within octocorals, something that has not yet been investigated for the large majority of zooxanthellate octocoral species.

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テーマセッション報告　琉球大学高度統合型熱帯海洋科学技術イノベーション創出研究拠点形成事業（ORCHIDS）プロジェクトにおける海洋科学研究の取組み

中村 崇, James Davis Reimer, 新城 竜一, 中村 衛, 田中 厚子, Hin Boo Wee

日本サンゴ礁学会誌 ( 日本サンゴ礁学会 )  21 ( 1 ) 1 - 12   2019年

掲載種別: 研究論文（学術雑誌）

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Zooxanthellate, Sclerite-Free, and Pseudopinnuled Octocoral Hadaka nudidomus gen. nov. et sp. nov. (Anthozoa, Octocorallia) from mesophotic reefs of the Southern Ryukyus Islands

Lau Y, Reimer JD

Diversity ( Diversity )  11 ( 10 )   2019年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Patterns of coexistence of six anemonefish species around subtropical Okinawa-jima Island, Japan

Hayashi K, K Tachihara, JD Reimer

Coral Reefs ( Coral Reefs )  37 ( 4 ) 1027 - 1038   2018年12月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Appearance of an anomalous black band disease at upper mesophotic depths after coral bleaching.

Kubomura T, Yamashiro H, Reimer JD

Diseases of aquatic organisms ( Diseases of Aquatic Organisms )  131 ( 3 ) 245 - 249   2018年11月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Zoantharia (Anthozoa: Hexacorallia) abundance and associations with Porifera and Hydrozoa across a depth gradient on the west coast of Curaçao

Reimer JD, HB Wee, JE Garcia-Hernandez, BW Hoeksema

Systematics and Biodiversity ( Systematics and Biodiversity )  16 ( 8 ) 820 - 830   2018年11月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Report of a Zoanthus Zone from the Cabo Verde Islands (Central Eastern Atlantic)

López C, R Freitas, E Magileviciute, SS Ratão, P Brehmer, JD Reimer

Thalassas ( Thalassas )  34 ( 2 ) 409 - 413   2018年10月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Urban coral reefs: Degradation and resilience of hard coral assemblages in coastal cities of East and Southeast Asia

EC Heery, BW Hoeksema, NK Browne, JD Reimer, PO Ang, D Huang, DA Friess, LM Chou, LHL Loke, P Saksena-Taylor, N Alsagoff, T Yeemin, M Sutthacheep, ST Vok, AR Bos, GS Gumanao, MAS Hussein, Z Waheed, DJW Lane, O Johan, A Kunzmann, J Jompar, Suharsono, D Taira, AG Bauman, PA Todd

Marine Pollution Bulletin ( Marine Pollution Bulletin )  135   654 - 681   2018年10月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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First record of sea urchin-associated Epizoanthus planus from Japanese waters and its morphology and molecular phylogeny

KISE HIROKI, DEWA NAOKO, REIMER JAMES DAVIS

日本ベントス研究会連絡誌 ( 日本プランクトン学会、日本ベントス学会 )  13 ( 3 ) 136 - 141   2018年08月

掲載種別: 研究論文（学術雑誌）

　概要を見る

&lt;p&gt;The species &lt;i&gt;Epizoanthus planus&lt;/i&gt; is the only known described zoantharian with an association with echinoderms, and it is known to live on the spines of living sea urchins from the family Cidaridae. This species has been reported from 741 to 1019 m in the Indian Ocean and the East China Sea. However, diagnostic characters are lacking in both the original description and subsequent studies. The present study reports the first record of &lt;i&gt;E. planus&lt;/i&gt; from Japanese waters (300–400 m) based on a newly collected specimen, and this record slightly extends the species distribution range in the northwest Pacific Ocean. This new record increases the number of &lt;i&gt;Epizoanthus&lt;/i&gt; species in Japanese waters to at least five species. Although many taxonomy and diversity studies have focused on specimens from SCUBA-based collections in Japanese waters, few studies have focused on zoantharians in deeper waters below SCUBA diving limits. The results of the present study highlight the importance of examining specimens from deeper waters to better understand the overall diversity of the order Zoantharia.&lt;/p&gt;

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Systematic Revision of Symbiodiniaceae Highlights the Antiquity and Diversity of Coral Endosymbionts.

LaJeunesse TC, Parkinson JE, Gabrielson PW, Jeong HJ, Reimer JD, Voolstra CR, Santos SR

Current biology : CB ( Current Biology )  28 ( 16 ) 2570 - 2580.e6   2018年08月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Population Connectivity in the Common Reef Zoantharian Zoanthus sansibaricus (Anthozoa: Hexacorallia) in Southern Japan.

Albinsky D, Wham D, Shinzato N, Reimer JD

Zoological science ( Zoological Science )  35 ( 4 ) 321 - 329   2018年08月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

Tropical and subtropical shallow benthic marine communities are highly diverse and balanced systems that constitute an important natural resource. Knowledge of the genetic diversity, connectivity and reproduction mode of each population is critical to understanding the fate of whole assemblages in times of disturbances. Importantly, the capability of populations to adapt to environmental challenges will be crucial to determining their survival. Here, we report on the population structure of the common reef zoantharian Zoanthus sansibaricus in the northwestern Pacific, by examining populations at three different locations in southern Japan using five highly variable microsatellite markers. Analyses of a population at the species' northern distribution limit combined with analyses of two subtropical populations suggest that habitat characteristics and ocean currents influence the connectivity and genetic diversity of this species. Our findings emphasize the adaptive ability of Z. sansibaricus to different environmental conditions and may help explain the wide distribution and generalist nature of this species.

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First records of zooxanthellate Zoanthus (Anthozoa: Hexacorallia: Zoantharia) from Korea and Japan (East) Sea

Reimer J.D.

Marine Biodiversity ( Marine Biodiversity )  48 ( 2 ) 1269 - 1273   2018年06月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

This report presents the first records of the zooxanthellate species Zoanthus sansibaricus (Anthozoa: Hexacorallia: Zoantharia: Zoanthidae) from Jeju Island, Korea, in the East China Sea, and from Dogo-jima Island in the Oki Islands, Japan, in the Sea of Japan (= East Sea). Its discovery at Jeju Island also represents the first formal record of the order Zoantharia from Korea, while the record from Dogo-jima Island is the first from the Sea of Japan. These two records greatly expand the recorded range of this widespread species, suggesting that it is highly tolerant of winter sea surface temperatures as low as 11.5 °C. Additionally, these records will provide important range limit information to compare with future findings in the face of global warming and predicted northward expansion of benthic zooxanthellate species.

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KB343, a Cyclic Tris-guanidine Alkaloid from Palauan Zoantharian Epizoanthus illoricatus

Matsumura K.

Organic Letters ( Organic Letters )  20 ( 10 ) 3039 - 3043   2018年05月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

A new tris-guanidine alkaloid, KB343 (1), was isolated from the aqueous extract of a Palauan zoantharian, Epizoanthus illoricatus. The structure of 1 was determined on the basis of spectral analyses of 1 and its derivatives. The absolute configuration for 1 was determined upon comparison of the CD spectrum of 1 to those obtained from density functional theory calculations. The structure of 1 is highly unusual, as three guanidine groups are present in one ring system.

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Phylogenetic analyses of Symbiodinium isolated from Waminoa and their anthozoan hosts in the Ryukyu Archipelago, southern Japan

Kunihiro S.

Symbiosis ( Symbiosis )  76 ( 3 ) 1 - 12   2018年05月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

It is known that the genus Waminoa (order Acoela, Family Convolutidae) associates with anthozoans (Scleractinia, Octocorallia, Zoantharia) and feeds on the mucus of their host. Despite the close relationship between Waminoa and its host species, it is known from phylogenetic analyses of sequences of the internal transcribed spacer 2 of ribosomal DNA (ITS-2) that photosymbiotic Symbiodinium isolated from Waminoa are different from the Symbiodinium of their anthozoan hosts. Additionally, Waminoa inherit their Symbiodinium and Amphidinium via vertical transmission. In the current study, we looked for and collected Waminoa from different anthozoan hosts from the Ryukyu Archipelago in southern Japan, and then examined the Symbiodinium of Waminoa as well as hosts’ Symbiodinium, and utilized sequences of the hyper-variable non-coding region of the plastid minicircle (psbAncr) in order to re-examine the diversity of Symbiodinium within Waminoa. In the resulting psbAncr phylogenetic tree, all Symbiodinium within Waminoa comprised a unique group within Clade C, all with the same genotype in the psbAncr phylogenetic tree. Our results reconfirm that most Waminoa host their own lineage of Symbiodinium, and demonstrate that Waminoa are also found on azooxanthellate anthozoan hosts, as we found Waminoa on Siphonogorgia sp., expanding their potential known habitat. Additionally, two Symbiodinium from Waminoa from both shallow (4 m) and mesophotic (32 m) depths were not included in main group of Symbiodinium from Waminoa in the ITS-2 phylogenetic tree, although we could not acquire psbAncr sequences for these specimens. Therefore it is possible that undetected Symbiodinium diversity may yet exist within Waminoa, and future work at shallow to mesophotic depths examining both zooxanthellate and azooxanthellate hosts may find more Waminoa and Symbiodinium diversity.

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Rafting in Zoantharia: a hitchhiker's guide to dispersal?

Santos MEA, Reimer JD

Marine pollution bulletin ( Marine Pollution Bulletin )  130   307 - 310   2018年05月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

The increasing availability of human-made structure in the oceans coupled with climate changes may lead to the range expansion of species able to disperse by rafting. In this study, we report on zoantharian species of genera 'saurus, Palythoa, Umimayanthus and Zoanthus covering artificial substrates in locations in both the Atlantic and Pacific oceans. Moreover, we reviewed observations of additional zoantharians as macrofouling organisms, and discuss the possible role of rafting in the dispersal of this cosmopolitan group. Traits reported to some zoantharian species, such as hermaphroditism and resistance to desiccation, support their dispersal potential by drifting attached to floating objects. Further reports of zoantharian species covering floating artificial structures and natural debris are needed to increase our knowledge of dispersal mechanisms in the oceans. Additionally, this information is essential to monitor and manage possible exotic species invasions, especially for zoantharian species that are common in the aquarium trade.

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Molecular Phylogeny Demonstrates the Need for Taxonomic Reconsideration of Species Diversity of the Hydrocoral Genus Millepora (Cnidaria: Hydrozoa) in the Pacific.

Takama O, Fernandez-Silva I, López C, Reimer JD

Zoological science ( Zoological Science )  35 ( 2 ) 123 - 133   2018年04月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

Millepora (Cnidaria: Hydrozoa: Milleporidae) spp. are distributed throughout shallow subtropical and tropical marine environments in the Indo-Pacific and Caribbean-Atlantic, and have traditionally been identified using pore characteristics and colony form. Until now, representatives of Millepora spp. on the island of Okinawa-jima, Japan, have been divided into five species; three branching species (Millepora intricata, M. tenera, M. dichotoma), one species with plate-like morphology (M. platyphylla), and one encrusting species (M. exaesa). There have been only a few reports from the Indo-Pacific that have studied the genetic diversity within Millepora spp., although phylogenetic analyses in the Caribbean-Atlantic have proven useful in delimiting closely-related species, while demonstrating that morphologically-based identification systems may have problems. In the present study, we sought to clarify taxonomic confusion of Millepora spp. in the Pacific by using sequence data of the ribosomal internal transcribed spacer (ITS-rDNA) of specimens from Okinawa, Japan and other localities (Johnston Atoll, Great Barrier Reef). Four separate clades were recovered from the ITS-rDNA analyses. Although we examined specimens of all three branching Millepora spp. previously reported from Okinawa-jima Island, in our phylogenetic analyses they were concentrated within a single clade, with only three specimens in other clades. Encrusting Millepora specimens were found within all clades, although it should be noted all species initially start as encrusting forms, and plate-like specimens were found within three clades. Our data also point to the existence of a previously unknown lineage within Millepora characterized by its ability to overgrow live scleractinian corals.

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Living fossil <em>Nanipora</em> (Anthozoa: Octocorallia) as the dominant calcifying benthos in a seagrass meadow in the South China Sea

James Reimer, Yee Wah Lau, Wee Hin Boo, Keryea Soong

Matters Select ( Sciencematters )    2018年02月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Speciation among sympatric lineages in the genus Palythoa (Cnidaria: Anthozoa: Zoantharia) revealed by morphological comparison, phylogenetic analyses and investigation of spawning period

Mizuyama M

PeerJ ( PeerJ )  2018 ( 7 )   2018年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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Stolonifera from shallow waters in the north-western Pacific: a description of a new genus and two new species within the Arulidae (Anthozoa, Octocorallia).

Lau YW, Stokvis FR, van Ofwegen LP, Reimer JD

ZooKeys ( ZooKeys )  2018 ( 790 ) 1 - 19   2018年 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

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The distribution of reef-dwelling Waminoa flatworms in bays and on capes of Okinawa Island

Biondi P.

Marine Biodiversity ( Marine Biodiversity )  49 ( 1 ) 1 - 9   2017年12月 [ 査読有り ]

掲載種別: 研究論文（学術雑誌）

　概要を見る

Waminoa spp. are acoel worms living on the surface of anthozoans. Despite being potential parasites, there is still not much information available regarding the genus’ distribution or host selectivity. The aim of this study was to evaluate the distribution and occurrence of Waminoa on coral reefs along the west coast of Okinawa Main Island (26.5° N, 127.9° E) in southern Japan, comparing sites located on capes with sites located in bays and identifying associated hosts. Scuba surveys were conducted along eight coral reef sites on the west coast of the island, between June and October 2016. Seven out of eight sites showed the presence of Waminoa. Occurrence and associated hosts varied considerably from site to site, and between sites located within bays and those at capes facing the open ocean. Waminoa individuals were significantly more abundant close to the sandy bottom at the lower end of the reef slopes and were always absent in the shallowest 5 m of every site. Waminoa coverage varied depending on the host anthozoan species. No significant differences in coverage were observed within the same host species at different sites. Thus, in Okinawa, the distribution of Waminoa on coral reefs is not random, but has patterns specific to certain anthozoan host species, with the highest occurrences within 10 m in depth from the sandy bottom areas of reefs.

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