著者

Pauline NARVAEZ Renato A. MORAIS

出版者

The Japanese Coral Reef Society

雑誌

Galaxea, Journal of Coral Reef Studies (ISSN:18830838)

巻号頁・発行日

vol.22, no.1, pp.31-36, 2020 (Released:2020-12-09)

参考文献数

36

被引用文献数

2

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Cleaner fishes remove ectoparasites, mucus and dead tissues from other ‘client’ organisms. These mutu-alistic interactions provide benefits for the ‘clients’ and, on a larger scale, maintain healthy reef ecosystems. Here, we report two species of angelfishes, Centropyge bicolor and C. tibicen, acting as cleaners of the blue tang Paracanthurus hepatus in an aquarium. This observation is the first time that pygmy angelfishes are recorded cleaning in any en-vironment. This novel cleaning ob-servation raises ques-tions on the ecosystem role of cleaner fishes and which biological traits facilitate cleaning.

著者

Tomoko Yuasa Takeo Horiguchi Osamu Takahashi

出版者

The Japanese Coral Reef Society

雑誌

Galaxea, Journal of Coral Reef Studies (ISSN:18830838)

巻号頁・発行日

pp.G2021_S5O, (Released:2021-11-19)

参考文献数

46

被引用文献数

1

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The ultrastructure of a symbiotic dinoflagellate Zooxanthella nutricula within the radiolarian Didymocyrtis tetrathalamus collected off the northwestern coast of Okinawa Island, Japan was examined in the symbiotic state and the cultured motile stage. In hospite, Z. nutricula had a coccoid morphology, and the typical dinoflagellate structures, i.e., cingulum, sulcus, and flagella were lost. The coccoid non-motile cells were surrounded by a perialgal envelope of the host radiolarian cytoplasm, and they possessed a dinokaryon with condensed chromosomes and mitochondria with tubular cristae. The chloroplast was located at the periphery of the cell and had one or two pyrenoids. In culture, however, the motile cells exhibited a typical cell shape of peridinioid dinoflagellates. The cell covering consisted of a plasma membrane and amphiesmal vesicles containing the thecal plates whose arrangement was congruent to the order Peridiniales. The chloroplast was enclosed by three membranes and the pyrenoid was the double-stalked type. Pusules constructed by tubules with invaginations were present, but eyespot and trichocysts were lacked. Symbiotic dinoflagellates, such as Zooxanthella, Symbiodinium, and Amphidinium, have historically been referred to using the general term ‘zooxanthella(e)' because of their similar appearances as yellow-brown spherical minute cells under light microscopy. However, the motile cells of Z. nutricula exhibited a typical peridinioid morphology and thecal plate arrangement that obviously differed from those of the other Symbiodiniaceae genera and Amphidinium. Considering the ultrastructural features and the currently available sequence database, it was suggested that Z. nutricula is a symbiotic dinoflagellate that lives specifically in holoplanktonic protist radiolarians.

著者

Ryosuke Murata Takafumi Amagai Daisuke Izumida Yuji Mushirobira Ryo Nozu Kiyoshi Soyano

出版者

The Japanese Coral Reef Society

雑誌

Galaxea, Journal of Coral Reef Studies (ISSN:18830838)

巻号頁・発行日

pp.G2021_S4R, (Released:2021-11-05)

参考文献数

35

被引用文献数

5

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To better understand the eco-physiological characteristics of reproduction in the coral reef small honeycomb grouper, Epinephelus merra, we investigated their spawning migration using biotelemetry, in addition to reproductive physiology analysis. Histological observations indicated that final ovarian maturation was not completed in honeycomb grouper collected from the coral reef pond (CRP), even during their spawning season. Additionally, our visual observations revealed that fish numbers decreased in the CRP after a full moon, which is thought to be their spawning time, suggesting their spawning migration. Next, we investigated the migration of honeycomb grouper during their spawning season using biotelemetry. Our investigations indicated that honeycomb grouper migrated from the inside of the CRP to the outside after a full moon, and then back to the inside again a few days later. These results strongly suggested that honeycomb grouper migrate to spawning sites located outside of the CRP, attain final ovarian maturation, and spawn after a full moon in the spawning season.

著者

Frederic Sinniger Ritzelle L. Albelda Rian Prasetia Héloïse Rouzé Erlangga D. Sitorus Saki Harii

出版者

The Japanese Coral Reef Society

雑誌

Galaxea, Journal of Coral Reef Studies (ISSN:18830838)

巻号頁・発行日

pp.G2021_S11N, (Released:2021-11-19)

参考文献数

23

被引用文献数

6

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Coral reef ecosystems extend beyond the standard SCUBA diving depth. These ecosystems found between approximately 30 and over 150 m are referred to as mesophotic coral ecosystems (MCEs). Mesophotic coral communities have already been reported from Okinawa over 50 years ago. However, since then little additional knowledge has been obtained on the distribution and diversity of mesophotic corals in the region. Here, we provide an overview of the coral communities observed at selected sites in the region around Sesoko Island. Using photo-quadrats, we surveyed coral communities and specifically the contribution of the dominant coral genera to the total coral cover between different sites at depths ranging from 30 to 80 m. We found that deep coral communities around Sesoko Island hold a high potential biodiversity and need to be taken into account into coastal management plans.

著者

Tetsuo Kuwamura

出版者

The Japanese Coral Reef Society

雑誌

Galaxea, Journal of Coral Reef Studies (ISSN:18830838)

巻号頁・発行日

pp.G2020_S3R, (Released:2021-11-19)

参考文献数

84

被引用文献数

2

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This review provides a brief summary of our field research on the behavioral ecology of coral reef fishes conducted at Sesoko Station, University of the Ryukyus, Okinawa, Japan. We have continued observations and experiments on fish behavior using SCUBA or by snorkeling on the fringing reefs of Sesoko Island since 1982. The results of our four main research subjects, that is, mimicry, parental care and mating systems, bidirectional sex change, and mate choice and alternative mating tactics, all of which have been major subjects of behavioral ecology, are summarized with references and historical information. The titles and speakers of papers, presented at two international meetings organized by the author and held at the Sesoko Station in 1991 and 2004, and field studies conducted on fishes in Sesoko Island by other researchers, including graduate students from various universities, are introduced. The Sesoko Station has been providing excellent facilities for field studies of coral reef fishes and has contributed greatly to the development of the behavioral ecology of fishes.

著者

Kent Elson S. Sorgon Rene A. Abesamis

出版者

The Japanese Coral Reef Society

雑誌

Galaxea, Journal of Coral Reef Studies (ISSN:18830838)

巻号頁・発行日

vol.25, no.1, pp.7-8, 2023 (Released:2022-10-19)

参考文献数

4

被引用文献数

1

著者

Kent Elson S. SORGON Victor S. TICZON Badi R. SAMANIEGO Marion Michael A. BACABAC Jesus Gabriel C. FETIL

出版者

The Japanese Coral Reef Society

雑誌

Galaxea, Journal of Coral Reef Studies (ISSN:18830838)

巻号頁・発行日

vol.23, no.1, pp.7-8, 2021 (Released:2021-06-05)

参考文献数

4

著者

Ming-Jay HO Chao-Yang KUO Hung-Yi WU Ming-Shiou JENG Shiahn-Wern SHYUE Chaolun Allen CHEN

出版者

The Japanese Coral Reef Society

雑誌

Galaxea, Journal of Coral Reef Studies (ISSN:18830838)

巻号頁・発行日

vol.22, no.1, pp.29-30, 2020 (Released:2020-12-09)

参考文献数

4

被引用文献数

2

著者

Héloïse ROUZÉ Frederic SINNIGER Saki HARII

出版者

The Japanese Coral Reef Society

雑誌

Galaxea, Journal of Coral Reef Studies (ISSN:18830838)

巻号頁・発行日

vol.21, no.1, pp.1-2, 2019 (Released:2019-04-11)

参考文献数

3

被引用文献数

1

著者

磯村 尚子 渡邊 謙太 西原 千尋 安部 真理子 山城 秀之

出版者

The Japanese Coral Reef Society

雑誌

日本サンゴ礁学会誌 (ISSN:13451421)

巻号頁・発行日

vol.12, pp.41-48, 2010

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沖縄県名護市大浦湾のアオサンゴ群集は,その大きさと特異な形状から保全が求められており,大浦湾のサンゴ礁生態系を代表する存在である。2009年に見られたアオサンゴの白化は,オオギケイソウがサンゴ表面に繁茂することでサンゴにダメージを与え,健康な状態を阻害された結果起きたものと考えられている。今回,アオサンゴ上にオオギケイソウとは異なる藻体が発見された。慶良間諸島で確認されたアミメヒラヤギにからむクダモの状況と類似していたことから,藻体はシアノバクテリアであると考えた。サンゴ礁域では,栄養塩の増加によって大発生したシアノバクテリアがサンゴにからみついてサンゴが死亡した例や,複数属のシアノバクテリアが引き起こす致死性の病気が知られている。そこで本研究では,大浦湾のアオサンゴ群体表面とその周辺の岩盤から採集した藻体の形態を顕微鏡で観察し,また16SrDNA配列を調べて,既知のシアノバクテリアの配列と比較して藻体の正体を明らかにし,さらにシアノバクテリアがアオサンゴへ及ぼす影響について検討することを目的とした。解析の結果,アオサンゴと岩盤から得られた藻体は,レプトリングビア属を始めとした複数属および複数種からなるシアノバクテリアのコンソーシアムであることがわかった。この中には,海水中の栄養塩濃度が高まると大量発生することもある<I>Lyngbya majuscula</I>や<I>Hydrocoleum lyngbyaceum</I>が含まれていた。今回確認されたシアノバクテリアがアオサンゴ群体に与えている影響は現段階では小さいと考えられるが,微少な生物ながらその繁茂については警戒が必要である。

著者

Andrew H. Baird Alasdair J. Edwards James R. Guest Saki Harii Masayuki Hatta Liam Lachs Hanaka Mera Frederic Sinniger David Abrego Or Ben-Zvi Omri Bronstein Patrick C. Cabaitan Vivian R. Cumbo Gal Eyal Lee Eyal-Shaham Bar Feldman Joana Figueiredo Jean-François Flot Mila Grinblat Andrew Heyward Michio Hidaka Mamiko Hirose Akira Iguchi Naoko Isomura Robert A. Kinzie Seiya Kitanobo Alyson Kuba Oren Levy Yossi Loya Takuma Mezaki Amin R. Mohamed Masaya Morita Satoshi Nojima Yoko Nozawa Rian Prasetia Eneour Puill-Stephan Catalina Ramirez-Portilla Hanna Rapuano Yaeli Rosenberg Yusuke Sakai Kazuhiko Sakai Tom Shlesinger Tullia I. Terraneo Irina Yakovleva Hiromi H. Yamamoto Kiyoshi Yamazato

出版者

The Japanese Coral Reef Society

雑誌

Galaxea, Journal of Coral Reef Studies (ISSN:18830838)

巻号頁・発行日

pp.G2021_S10O, (Released:2021-11-19)

参考文献数

27

被引用文献数

11

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Sesoko Station, Okinawa, has been the site of many significant advances in coral reproductive research and it continues to be a preferred destination for both Japanese and international researchers. Consequently, there are decades of spawning observations, which we present and explore here with the aim of making it easier to predict when species spawn at Sesoko Station. The data include over 700 spawning observations from 87 species of reef-building hermatypic corals. Almost all spawning occurred between dusk and dawn, with most spawning activity concentrated in the 2 to 4 hours after sunset. Some phylogenetic patterns were evident: most Acropora species spawn on or around the 6th full moon after December 21st (the northern hemisphere winter solstice); spawning in common species of merulinids and Porites appears to be concentrated around the 7th full moon and spawning in the fungiids around the 8th and subsequent full moons. The night of peak spawning with respect to the night of the full moon varied considerably among years in common Acropora species, but was dependent on the calendar date of the full moon in May or June. Therefore, despite an extended spawning season of over three months and considerable variation in the calendar date of spawning in many species among years, the month and night of spawning are reasonably predictable for many species enhancing the value of Sesoko Station as a site for coral reproductive research.

著者

Masako NAKAMURA Hiroyuki YOKOCHI

出版者

The Japanese Coral Reef Society

雑誌

Galaxea, Journal of Coral Reef Studies (ISSN:18830838)

巻号頁・発行日

vol.22, no.1, pp.3-4, 2020 (Released:2020-06-18)

参考文献数

4

被引用文献数

1

著者

Shu Qin SAM Daisuke TAIRA Chin Soon Lionel NG Tai Chong TOH Loke Ming CHOU

出版者

The Japanese Coral Reef Society

雑誌

Galaxea, Journal of Coral Reef Studies (ISSN:18830838)

巻号頁・発行日

vol.20, no.1, pp.9-10, 2018 (Released:2018-06-14)

参考文献数

8

被引用文献数

4

著者

高田 宜武 阿部 寧 長尾 正之 鈴木 淳 小林 都 大井 理恵 橋本 和正 渋野 拓郎

出版者

The Japanese Coral Reef Society

雑誌

日本サンゴ礁学会誌 (ISSN:13451421)

巻号頁・発行日

vol.2005, no.7, pp.37-48, 2005

被引用文献数

6

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サンゴ礁生態系は世界的に劣化しつつあるといわれており、陸域から流入する「赤土」等の懸濁物粒子による海水濁度の上昇が、その要因の一つとして挙げられている。そこで、サンゴ礁池における海水濁度の変動レベルとその要因を知るために、石垣島浦底湾において2年間の採水観測を行った。岸近くの突堤表層では、濁度は2.26NTUを中央値とするが、変動幅が大きく、最高値92.9NTUを記録した。サンゴの生育している湾奥 (150m沖) と湾中央部 (370m沖) では、0.58NTUと0.36NTU (それぞれ表層の中央値) となった。海水濁度の変動要因として、降雨と風向の影響を解析したところ、降雨量と濁度の相関は弱いが、北西風により濁度が上昇する傾向があった。冬期に濁度が高くなるのは、冬期に多い北よりの風の影響だといえる。浦底湾のように、河川流入の影響が小さい礁池では、風波によって底質に沈殿していた粒子が再懸濁することと、表層に発達する高濁度かつ低塩分水の吹送が、礁池内の海水濁度に大きく影響すると考えられた。

著者

棚原 朗 仲栄 真史哉 鈴木 秀隆 金城 嘉哉

出版者

The Japanese Coral Reef Society

雑誌

日本サンゴ礁学会誌 (ISSN:13451421)

巻号頁・発行日

vol.15, no.1, pp.79-89, 2013

被引用文献数

1

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沖縄県那覇市の国場川と饒波川の下流域に広がる漫湖干潟において柱状試料を採取し,それに記録された金属元素濃度の経年変化を解析した。干潟は人口密集地に位置し,周辺および河川上流域の開発に伴い重金属が土壌と共に流入していると考えられる。得られた柱状試料の ²¹⁰ Pb _ex 法による堆積速度は1.1~1.9cm・y ^-1(2.1~3.7g・cm ^-2・y ^-1 )と比較的速いことが分かった。金属元素濃度の経年変化として,主成分元素の一つであるアルミニウムの濃度変動は小さく,カルシウムは1900年代から増加傾向を示した。鉛は1950年代から増加傾向を示したが,1980年代から減少傾向にあり,自動車ガソリンの無鉛化が影響している。その他の重金属(Ni,Cu,Hg)は,饒波川下流では少なく両方の川が合流する地点で高い濃度を示したことから,主な起源として国場川からの流入が示唆された。

著者

J.E.N. VERON Lyndon M. DEVANTIER Emre TURAK Alison L. GREEN Stuart KININMONTH Mary STAFFORD-SMITH Nate PETERSON

出版者

The Japanese Coral Reef Society

雑誌

Galaxea, Journal of Coral Reef Studies (ISSN:18830838)

巻号頁・発行日

vol.11, no.2, pp.91-100, 2009 (Released:2010-08-07)

参考文献数

49

被引用文献数

200 392

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Spatial analyses of coral distributions at species level delineate the Coral Triangle and provide new insights into patterns of diversity and endemism around the globe. This study shows that the Coral Triangle, an area extending from the Philippines to the Solomon Islands, has 605 zooxanthellate corals including 15 regional endemics. This amounts to 76% of the world's total species complement, giving this province the world's highest conservation priority. Within the Coral Triangle, highest richness resides in the Bird's Head Peninsula of Indonesian Papua which hosts 574 species, with individual reefs supporting up to 280 species ha-1. Reasons for the exceptional richness of the Coral Triangle include the geological setting, physical environment and an array of ecological processes. These findings, supported by parallel distributions of reef fishes and other taxa, provide a clear scientific justification for the Coral Triangle Initiative, arguably one of the world's most significant reef conservation undertakings.