Shin’ichi Sato, M. Azuma, Takaki Yamanaka, Yusuke Yoda, M. Matsuo, Masanori Sato
{"title":"Interannual variation from 1997 to 2015 in bottom sediments and community structures of macrobenthic fauna in the Ariake Sea, western Kyushu, Japan","authors":"Shin’ichi Sato, M. Azuma, Takaki Yamanaka, Yusuke Yoda, M. Matsuo, Masanori Sato","doi":"10.5179/benthos.75.54","DOIUrl":"https://doi.org/10.5179/benthos.75.54","url":null,"abstract":": In order to evaluate the effect of 35.5 km 2 of land reclamation in Isahaya Bay in the inner part of the Ariake Sea, Japan, we analyzed the interannual variation in the bottom sediments and community structures of macrobenthic fauna across the whole area of the Ariake Sea. Sediment samples were collected from 82 fixed subtidal stations consisting of four parts （ inner, central-north, central-south, and mouth parts ） in June 1997 （ two months after the complete closure of the inner Isa haya Bay by the 7-km dike ） , June 2002 （ two months after the temporary recovery of limited tidal currents within the inner Isahaya Bay by the opening of the water gates in the dike ） , June 2007, and June 2015. The median particle diameter of the bottom sediments decreased at many stations around the central to mouth parts of the Ariake Sea from 2002 to 2007, and it increased from 2007 to 2015. A total of 29,885 macrobenthic invertebrates （ mean density 7,289 ind./m 2 ） were collected from the 82 fixed subtidal stations in June 1997, and the most dominant taxa were polychaetes, gammaridean amphipods, ophiuroids, and bivalves. In June 2002, 62,314 individuals （ mean density 15,199 ind./m 2 ） were collected from the same sta tions. However, the number and density of the macrobenthos declined to 11,992 （ 2,925 ind./m 2 ） in June 2007 and 17,669 （ 4,310 ind./m 2 ） in June 2015. A similar pattern of the variation （ i.e., an increase from 1997 to 2002, and a decrease from 2002 to 2007 and 2015 ） was commonly observed in the densities of each dominant taxon, and for all macrobenthos in each of the four parts of the Ariake Sea, although the variation was more remarkable in the inner and central-north parts than in the others. Our results suggest that the macrobenthic community has declined from 2002 to 2007 and 2015 not only around Isahaya Bay （ in the inner part of the Ariake Sea ） , but across the whole area.","PeriodicalId":325376,"journal":{"name":"Japanese Journal of Benthology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128714908","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}
Kohei Oshiro, Isao Hirabayashi, Yumi Henmi, R. Goto
{"title":"Records of the giant spoon worm Ikeda taenioides (Annelida: Echiura: Ikedidae) from the Kii Peninsula, the Sea of Japan, and Amami-Oshima Island","authors":"Kohei Oshiro, Isao Hirabayashi, Yumi Henmi, R. Goto","doi":"10.5179/benthos.74.93","DOIUrl":"https://doi.org/10.5179/benthos.74.93","url":null,"abstract":": Ikeda taenioides （ Ikeda, 1904 ） （ Annelida: Echiura: Ikedidae ） is the largest spoon worm in the world and has been recorded only from Japanese coasts. This species was described by Ikeda in 1904 and then collected from various local-ities in Japan by the middle of the 20th century. However, this species has dramatically decreased in number because of habi-tat destruction and human activities; it has not been recorded recently, except for in Kagoshima Bay, the Tohoku district, and the Seto Inland Sea. Thus, a field survey is required to reevaluate its current distribution. In this study, we collected probos cises of I. taeniodes using a yabby pump in a mud flat in Tanabe Bay （ Wakayama Prefecture ） located in the southwestern part of the Kii Peninsula, Japan. We also sampled a proboscis of I. taenioides using a Smith-McIntyre grab sampler at a depth of 25 m in the mouth of Maizuru Bay （ Kyoto Prefecture ） , the Sea of Japan. The former and latter samples update the records of I. taenioides from the Kii Peninsula and Sea of Japan for the first time in 70 and 51 years, respectively. Moreover, we also observed a proboscis, most likely I. taeniodes , coming out of a burrow entrance at a water depth of 21 m off Kuninao, Ama-mi-Oshima Island （ Kagoshima Prefecture ） , Japan, which may update the southern limit of the distribution of this species. The specimens from Kii Peninsula and Maizuru Bay were genetically identified to be I. taenioides by comparing with those from the Seto Inland Sea and Tohoku district by a COI marker. Our findings suggest that I. taenioides may be still broadly distributed along the coasts of Japanese Islands, from Mutsu to Ryukyu Islands, both in the Pacific and Sea of Japan sides.","PeriodicalId":325376,"journal":{"name":"Japanese Journal of Benthology","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122496359","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":"Information for contributors","authors":"","doi":"10.5179/benthos.74.153","DOIUrl":"https://doi.org/10.5179/benthos.74.153","url":null,"abstract":"","PeriodicalId":325376,"journal":{"name":"Japanese Journal of Benthology","volume":"56 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120931245","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":"Business Report","authors":"Laurie Meintjes","doi":"10.5179/benthos.72.106","DOIUrl":"https://doi.org/10.5179/benthos.72.106","url":null,"abstract":"A business report is an evaluation or assessment of a particular issue or set of circumstances or financial operations that relate to the performance of a business. It is usually written in response to a request by a senior executive of the company, and often takes the form of a memo with the report attached. For example, a company manager who is concerned about undue wastage in the packaging department might request the OIC of the Packaging Department to look into the issue and to submit a report that highlights the problems and recommends solutions. While most business reports focus on existing issues, they can also be predictive in nature. For example, a manager might commission a report that evaluates the current use of computer technology in a company, and which recommends how the company might best position itself so that it can benefit from any future developments in computer technology.","PeriodicalId":325376,"journal":{"name":"Japanese Journal of Benthology","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127709616","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":"13th International Polychaete Conference参加報告","authors":"","doi":"10.5179/benthos.74.123","DOIUrl":"https://doi.org/10.5179/benthos.74.123","url":null,"abstract":"","PeriodicalId":325376,"journal":{"name":"Japanese Journal of Benthology","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121176813","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}
Shin’ichi Sato, M. Azuma, M. Matsuo, A. Ohtaka, S. Kondo, T. Ichikawa, Masanori Sato
{"title":"Interannual variation in water quality, bottom sediments, and community structures of macrobenthic fauna in the Isahaya Bay reservoir, western Kyushu, Japan","authors":"Shin’ichi Sato, M. Azuma, M. Matsuo, A. Ohtaka, S. Kondo, T. Ichikawa, Masanori Sato","doi":"10.5179/benthos.74.115","DOIUrl":"https://doi.org/10.5179/benthos.74.115","url":null,"abstract":": The inner region of Isahaya Bay was isolated from the Ariake Sea, due to the construction of a dike, on April 14, 1997. We monitored water quality and oxidation-reduction potential （ ORP ） of bottom sediments in the reservoir for 21 years, from March 1997 to June 2018. We also analyzed the variation in community structure of macrobenthic fauna using sediment samples collected at 16 permanent stations and 8 temporary stations. After the seawater inflow was shut-off, mean individual densities of macrobenthic animals rapidly declined from 1997 to 1999, and then only a few species, such as Potamocorbula sp. and Sinocorophium sinensis greatly increased in their populations from 2001 to 2002. However, from 2003 to 2018, most of them decreased rapidly in the inner region of Isahaya Bay. Our results suggested that, interannual variation in macrobenthic fauna is affected by variation in water quality and bottom sediments.","PeriodicalId":325376,"journal":{"name":"Japanese Journal of Benthology","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131582456","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}
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