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Macrobenthos consists of the organisms that live at the bottom of a water column〔J.S. Link, C.A. Griswold, E.T. Methratta, J. Gunnard, Editors. 2006. (Documentation for the Energy Modeling and Analysis eXercise (EMAX) ). United States Department of Commerce, Northeast Fisheries Science Center. Reference Document 06-15 Chapter 8.〕 and are visible to the naked eye. In some classification schemes, these organisms are larger than 1 mm;〔 in another, the smallest dimension must be at least 0.5 mm.〔(【引用サイトリンク】 Macrobenthos definition )〕 They include polychaete worms, pelecypods, anthozoans, echinoderms, sponges, ascidians, crustaceans. A visual examination of macroorganisms at the bottom of an aquatic ecosystem can be a good indicator of water quality.〔Mulligan CN, Fukue M and Sato Y (2010) (''Sediments Contamination and Sustainable Remediation'' ) page 30, CRC Press. ISBN 9781420062236.〕 Image:Posidonia oceanica Portofino 02.jpg|Seagrass. Image:Nerr0878.jpg|Echinoderms Image:Scheibenanemonen (Actinodiscus spec).jpg|Stony corals Image:Seasquirt.jpg|A sea squirt being used as a substrate for a nudibranch's egg spiral. ==References== 〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Macrobenthos」の詳細全文を読む スポンサード リンク
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