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北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University >
第66巻 第2号 >


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Title: アサリの定位方向が摂食効率に与える影響
Other Titles: Effects of Burrowing Direction on Feeding Efficiency of the Short-necked Clam Ruditapes philippinarum
Authors: 岩城, 里奈1 Browse this author
田村, 亮輔2 Browse this author
五嶋, 聖治3 Browse this author →KAKEN DB
Authors(alt): Iwaki, Rina1
Tamura, Ryosuke2
Goshima, Seiji3
Keywords: Short-necked clam
Burrowing direction
Burrowing depth
Clearance rate
Feeding efficienncy
Shell growth
Hakodate Bay
Issue Date: 10-Aug-2016
Publisher: 北海道大学大学院水産科学研究院
Journal Title: 北海道大学水産科学研究彙報
Volume: 66
Issue: 2
Start Page: 63
End Page: 68
Abstract: The substratum of Tateno fishing ground of the short-necked clam, Ruditapes philippinarum, Hakodate Bay, Hokkaido, Japan is characterized by higher percentage of cobbles and pebbles compared with other regions. The shell growth rate of the adult clam in this region is slower than that of other fishing grounds. In this study, the relationship between the uncommon sediment composition and the depressed growth was examined from the viewpoint of feeding efficiency of the clam. Infaunal bivalves usually stay with vertically directed siphons up to the sediment surface in suspension feeding, but in this region the clams often burrow into the sediment at an angle when they cannot burrow into sediment deeper. In the laboratory experiment the clam could not turn its valves but often extended its siphons up under condition of restricted burrowing. Filtration rate of the clam, which was estimated by changes in the chlorophyll-α concentration of the diatom Chaetoceros gracilis as an algal diet, was the highest in the vertical position of siphons among all setup directions. Therefore, the short-necked clam cannot keep their body the most effective direction by restricted burrowing due to many cobbles and pebbles, which may cause food intake reduction. It seems one of the reasons for depressed growth of the short-necked clam in this region.
Type: bulletin (article)
Appears in Collections:北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University > 第66巻 第2号

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