著者

村上 和仁 今富 幸也 駒井 幸雄 永淵 修 清木 徹 小山 武信

出版者

公益社団法人 日本水環境学会

雑誌

水環境学会誌 (ISSN:09168958)

巻号頁・発行日

vol.21, no.11, pp.757-764, 1998-11-10 (Released:2008-01-22)

参考文献数

25

被引用文献数

2 4

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The Seto Inland Sea in Japan is well known world-widely as one of the famous enclosed coastal sea, which is surrounded on all sides by the three large islands of Honshu, Kyushu and Shikoku, and is the largest inland sea in Japan (area ; 22,000Km2, total coastline ; 6,600Km, average depth ; 38m). In order to obtain the information about the environmental condition in the Seto Inland Sea, the quantity and distribution of macrobenthos, especially Annelida which is considered to indicate the sedimental condition, were investigated from the 425 sedimental samples as the Investigation for Environmental Management of the Seto Inland Sea (IEMS), which conducted from 1991 to 1996.The results obtained can be concluded as follows:1) The macrobenthos mainly observed in the Seto Inland Sea were Lumbrineris longiforia, Paraprionospio spp., Prionospio ehlersi and Theora fragilis, which were recognized as the indicator species of organic pollution.2) 16species of Spionidae were observed, i.e. Paraprionospio sp., Prionospio ehlersi, P. cirrifrea, Spiophanes sp. and so on.3) The species number and the individual number of Annelida were decreased with increase of muddy ratio, IL, COD, T-N, T-P and TOC.4) The species number and the individual number of Annelida were decresed with increase of Cd, Cu, Ph, Zn and Mn.5) Organic pollution was suggested especially in inner bay area because of dominations of some species of Annelida, Spionidae.

著者

清木 徹 伊達 悦二 岡田 光正

出版者

公益社団法人日本水産学会

雑誌

日本水産学会誌 (ISSN:00215392)

巻号頁・発行日

vol.74, no.4, pp.678-687, 2008-07-15

被引用文献数

1 5

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干潟及び沿岸海底の脱窒と窒素固定が環境水中でのN収支に果たす役割を調べる目的で,それらの現場速度や環境因子との関係を検討した。定期的に調査した島しょ部の干潟では両プロセスの物質収支がNソースとなっていたが,不定期測定を行った他の干潟ではNシンクのものの方が多く,干潟により両速度の相対的関係は異なっていた。一方,湾海底は全地点シンク作用を示した。また,両速度とも水温と有意な相関が認められ,脱窒速度は水温以外に水中の硝酸濃度及び底泥中のベントス現存量とも有意な相関を示した。脱窒速度とベントスとの関係は,底泥に棲息しているベントスが脱窒菌に何らかの影響を及ぼし脱窒活性を高めている事を示唆していた。