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タイトルヨミ
ジンザイ コ ジンコウ イケ ニ オケル ヤマト シジミ ノ
タイトル別表記
Feeding, egestion and digestion of Corbicula japonica collected from an artificial shallow pond near the brackish Lake Jinzai
ファイル
言語
日本語
著者
辻井 要介
江原 亮
草田 和美
板倉 俊一
品川 明
秦 明徳
中村 幹雄
内容記述(抄録等)
We studied feeding, egestion and digestion of Corbicula japonica in the laboratory. Clams were collected from an artificial shallow pond(20-60 cm deep)near the brackish Lake Jinzai in 2001. Pond water was supplied continuously from Lake Jinzai using a pump. Feces and pseudo-feces of the clams were observed by microscope.
Clam pseudo-feces were irregular, wooly, and brown in color when clam fed phytoplankton. These were mainly composed of living micro-algae, detritus, cf. amoebocytes and protozoa. When clams were placed in filtrated water, they mainly egested inorganic particles and detritus. Clam fecal pellets were clearly divided into two types, namely, undigested feces and digested feces. Undigested feces consisted of many living cells of benthic and planktonic micro-algae(diatoms, chlorophytes, dinoflagellates, cyanobacteria)and detritus. These were rod or ribbon shaped, opaque, dark brown in color. Digested feces consisted of many brown particles(ca. 0.5-3μm), mucilage, bacteria, and a small number of micro-algae and protozoa. These were ribbon or intestine shaped, translucent or opaque, brown or dark brown in color.
From small particle sizes and almost absence of micro-algae in digested feces, and from presence of many living cells of micro-algae in undigested feces, C. japonica seems to feed and digest detritus, small living planktonic and benthic micro-algae which could pass through mouth to midgut gland of the clams. Foods ingested from mouth which could not pass to midgut gland egested as undigested feces.
主題
Corbicula japonica
micro-algae
feeding
egestion
digested feces
undigested
掲載誌名
Laguna : 汽水域研究
11
開始ページ
109
終了ページ
124
ISSN
21852995
発行日
2004-06
NCID
AN10439529
出版者
島根大学汽水域研究センター
資料タイプ
紀要論文
ファイル形式
PDF
著者版/出版社版
出版社版
部局
研究・学術情報機構 エスチュアリー研究センター
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