- 著者
- Masanori Nonaka Takeshi Hayashibara
- 出版者
- The Japanese Society of Systematic Zoology
- 雑誌
- Species Diversity (ISSN:13421670)
- 巻号頁・発行日
- vol.26, no.2, pp.297-342, 2021-10-14 (Released:2021-10-14)
- 参考文献数
- 34
- 被引用文献数
- 2
Investigations were carried out on 22 deep-water octocoral specimens in the family Coralliidae sampled from the Emperor Seamounts during 2009 to 2012. The specimens were collected from 350–1100 m deep, mostly from the southernmost region of the Emperor Seamounts. Colonies were identified by visual and microscopic observation of standard morphological characters (colony size, diameters of colony base and branches, diameter and height of autozooid mound, thickness of coenenchyme and sclerite sizes, etc.) along with supporting information from molecular DNA analysis. Half of the 22 specimens were identified as Pleurocorallium cf. pusillum (Kishinouye, 1903), suggesting that the species called “Mid” that was once harvested dominantly in this area was this species. The remaining 11 specimens were identified as genus Hemicorallium Gray, 1867. These were identified as belonging to the following species: one previously described species [H. laauense (Bayer, 1956)], three similar species [H. cf. abyssale (Bayer, 1956), H. cf. regale (Bayer, 1956), H. cf. sulcatum (Kishinouye, 1903)] and three new species (H. kaiyo sp. nov., H. muzikae sp. nov. and H. tokiyasui sp. nov.).
- 著者
- Hajime KAYANNE Chuki HONGO Ken OKAJI Yoichi IDE Takeshi HAYASHIBARA Hidekazu YAMAMOTO Nobuo MIKAMI Kiyoshi ONODERA Takaaki OOTSUBO Hiroyuki TAKANO Makoto TONEGAWA Shogo MARUYAMA
- 出版者
- 日本サンゴ礁学会
- 雑誌
- Galaxea, Journal of Coral Reef Studies (ISSN:18830838)
- 巻号頁・発行日
- vol.14, no.1, pp.73-95, 2012 (Released:2013-02-04)
- 参考文献数
- 37
- 被引用文献数
- 1 7 1
Ninety-three coral species have been identified at Okinotorishima (Okinotori Island), an isolated table reef located in the center of the Philippine Sea. The species composition of the island is similar to that of other islands in the northwestern Pacific, but the number of species is small in comparison with surrounding islands. The coral fauna at the island is characterized by a unique species composition that is independent of the Ryukyu Islands, mainland Japan, Palau, and the Mariana Islands. No endemic species were found, but the dominant Acropora species (A. aculeus, A. sp. aff. divaricata, and A. globiceps) were morphologically different from corresponding species at the Ryukyu Islands. The relatively low species diversity at the island despite the close proximity to an area of high diversity is explained by its small habitat diversity and isolation from other islands. The island is located in a subtropical gyre and is isolated from major currents. Thus, only coral larvae with a long competency period (as long as 70 days) can settle at the island from surrounding islands. This unique species composition seems to have been maintained for at least the last 7600 years, since the last stage of sea level rise in the post-glacial period (Holocene).