Effect of Silt and Clay on the Settlement of Short-necked Clam <I>Ruditapes philippinarum</I> Larvae
スポンサーリンク
概要
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In this study, we investigated the effect of silt and clay in the sediment on the settlement of <I>Ruditapes philippinarum</I> larvae. Mountain, river and sea sands of which silt and clay (< 0.075 mm) content was adjusted using silt and clay originating from these sands or dredged sediment (DS) were examined for settlement of <I>R. philippinarum</I> larvae. The addition of DS and Otagawa river sand-originated silt and clay did not accelerate the larval settlement, whereas the mountain and Jigozen sea sands-originated silt and clay promoted larval settlement at 5%. The negative impact of Otagawa river sand-originated silt and clay might be due to its high leachability of Mn, while the accelerated larval settlement by Jigozen sea sands-originated silt and clay could be attributed to its organic contents. The provided results indicate that a suitable ratio of the fine particles to coarse particles exists for the acceleration of the larval settlement, though the effect might be dependent on their chemical properties.
著者
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OKUDA Tetsuji
Environmental Research and Management Center, Hiroshima University, Japan
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NISHIJIMA Wataru
Environmental Research and Management Center, Hiroshima University, Japan
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Nakai Satoshi
Graduate School Of Environment And Information Sciences Yokohama National University
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Okuda Tetsuji
Environmental Research & Management Center, Hiroshima University
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Nishijima Wataru
Environmental Research & Management Center, Hiroshima University
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ISHII Ryo
Sanyo Techno Marine Inc., Japan
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OKADA Mitsumasa
Graduate Program for Social Management Science, Open University of Japan, Japan
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ISHII Ryo
Sanyo Techno Marine Inc.
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NAKAI Satoshi
Graduate School of Engineering, Hiroshima University, Japan
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