K. Okaji, Keiji Ito, Tomofumi Nagata, Yoshimi Higa, Akifumi Tsuha
{"title":"Growth of five species of Acropora transplanted on the reef of Onna Village, Okinawa, Japan","authors":"K. Okaji, Keiji Ito, Tomofumi Nagata, Yoshimi Higa, Akifumi Tsuha","doi":"10.3755/jcrs.22.1","DOIUrl":"https://doi.org/10.3755/jcrs.22.1","url":null,"abstract":"","PeriodicalId":432348,"journal":{"name":"Journal of The Japanese Coral Reef Society","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123124299","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Topics on current taxonomy of corals, II Why is it difficult to identify the species of Montipora corals?","authors":"K. Nomura, G. Suzuki","doi":"10.3755/jcrs.23.27","DOIUrl":"https://doi.org/10.3755/jcrs.23.27","url":null,"abstract":"","PeriodicalId":432348,"journal":{"name":"Journal of The Japanese Coral Reef Society","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126367326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N. Isomura, Kenta Watanabe, Chihiro Nishihara, Mariko Abe, H. Yamashiro
{"title":"Genetic identification of cyanobacteria on Heliopora coerulea in Oura Bay","authors":"N. Isomura, Kenta Watanabe, Chihiro Nishihara, Mariko Abe, H. Yamashiro","doi":"10.3755/JCRS.12.41","DOIUrl":"https://doi.org/10.3755/JCRS.12.41","url":null,"abstract":"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Lyngbya majusculaやHydrocoleum lyngbyaceum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。","PeriodicalId":432348,"journal":{"name":"Journal of The Japanese Coral Reef Society","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126039504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Assessing the potential for community shift from hard coral to soft coral and its impact","authors":"S. Inoue, A. Takahashi","doi":"10.3755/JCRS.16.29","DOIUrl":"https://doi.org/10.3755/JCRS.16.29","url":null,"abstract":"Coral reefs worldwide are now under threat of degradation and destruction by ocean acidification and global warming. Local anthropogenic impacts such as eutrophication and turbidity also weaken them. With the degradation of coral reefs, coral reef communities shift from an ecosystem dominated by hard coral to other organisms. Here we consider soft coral as an example of an organism that can replace hard corals in a reef community. In the Ryukyu Islands, soft coral is a typical organism found in coral reefs and is present at a high den-sity. However, there are far fewer published studies of soft coral than of hard corals. Therefore, few studies have quantitatively assessed the potential for a community to shift from hard coral to soft coral. Many studies of hard coral can be applicable to soft coral because they have some points in common, such as their habitat and body structure. We can consider a possible or ongoing community shift in coral reefs by comparing hard and soft coral directly, using the perspectives and techniques of hard coral studies for the study of soft coral. Here we introduce the concept of community shifts in the coral reef community with regard to previous studies. We dis-cuss the possibility and the importance of a community shift from hard to soft coral. The causes and mechanisms of the community shift are considered alongside the biological features and physical structure of soft coral. To investigate the mechanisms involved, we suggest some approaches that can be used to understand the degree of community shift occurring. Finally, we consider how the coral reef ecosystem would be affected by such a community shift. We need to undertake a multidisciplinary approach to understand the changing coral reef habitat. As an example, we suggest how to assess a community shift by collaborative studies of hard and soft coral.","PeriodicalId":432348,"journal":{"name":"Journal of The Japanese Coral Reef Society","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114211245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Coral reefs studies by Professor Tatsuo Takahashi: view of research and education revealed through the interview","authors":"Takanori Satoh, H. Kan","doi":"10.3755/JCRS.22.19","DOIUrl":"https://doi.org/10.3755/JCRS.22.19","url":null,"abstract":"","PeriodicalId":432348,"journal":{"name":"Journal of The Japanese Coral Reef Society","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116208564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Yamazaki, Tsuyoshi Watanabe, K. Sowa, S. Nakachi, H. Yamano, F. Iwase
{"title":"Reconstructing palaeoenvironments of temperate regions based on high latitude corals at Tatsukushi Bay in Japan","authors":"A. Yamazaki, Tsuyoshi Watanabe, K. Sowa, S. Nakachi, H. Yamano, F. Iwase","doi":"10.3755/JCRS.11.91","DOIUrl":"https://doi.org/10.3755/JCRS.11.91","url":null,"abstract":"温帯域の造礁性サンゴは地球温暖化や海洋酸性化の影響を敏感に反映し,骨格に記録していることが期待される。温帯域に生息する造礁性サンゴ骨格を用いた古環境復元の可能性を検討するため,高知県土佐清水市竜串湾において塊状のPorites lutea(コブハマサンゴ)骨格のコア試料を採取し,骨格の酸素・炭素同位体比分析及び軟X線画像解析,蛍光バンド観察を行った。現場の水温変化と比較するとサンゴ骨格の酸素同位体比には低水温が反映されていなかった。また軟X線画像解析の結果,低水温時には高密度バンドを形成し,骨格伸長量及び石灰化量が高水温時に比べ大きく減衰することがわかった。以上の結果からも本研究試料のサンゴは低水温時に骨格成長速度が著しく低下していると考えられる。炭素同位体比の値は2001年から2008年にかけて増大傾向にあった。蛍光バンドは2001年から2005年の間で強く観察された。また,2001年に竜串湾で起こった集中豪雨による懸濁物質の流入から竜串湾の濁度は数年間を経て減少しており,サンゴの光合成量が徐々に増大していることが示唆された。本研究試料は今後,コア全尺の分析により過去数百年間の海水温の変化を検出できる可能性がある。また,同時に竜串湾沿岸の開発や漁業,災害を記録していると考えられ,長期間にわたる竜串湾の歴史を復元できることが期待される。","PeriodicalId":432348,"journal":{"name":"Journal of The Japanese Coral Reef Society","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124523381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Coral conservation activities of private sector","authors":"Y. Miyamoto","doi":"10.3755/JCRS.19.143","DOIUrl":"https://doi.org/10.3755/JCRS.19.143","url":null,"abstract":"Summary of private sector’s activities for massive coral bleaching event in Japan on 2016 is described. Also, coral conservation activities and coral bleaching mitigation activities are proposed.","PeriodicalId":432348,"journal":{"name":"Journal of The Japanese Coral Reef Society","volume":"156 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132383195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Tanahara, F. Nakaema, Hidetaka Suzuki, Yoshiya Kinjyo
{"title":"Chronological changes in heavy metal concentration in sediment collected from Manko tideland","authors":"A. Tanahara, F. Nakaema, Hidetaka Suzuki, Yoshiya Kinjyo","doi":"10.3755/JCRS.15.79","DOIUrl":"https://doi.org/10.3755/JCRS.15.79","url":null,"abstract":"","PeriodicalId":432348,"journal":{"name":"Journal of The Japanese Coral Reef Society","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115317355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}