Effect of Particle Size and Shape of Sandy Soil on Burrowing of Surf Clam, <i>Donax semigranosus</i> (Dunker) under Standing Conditions

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  • Kajihara Naoto
    National Research Institute of Fisheries and Environment of Inland Sea
  • Yang Soonbo
    Port and Airport Research Institute, National Institute of Maritime, Port and Aviation Technology
  • Sassa Shinji
    Port and Airport Research Institute, National Institute of Maritime, Port and Aviation Technology

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Other Title
  • 静置下におけるフジノハナガイ<i>Donax semigranosus</i>（Dunker）の潜砂に与える砂質土砂の粒径と形状の影響
  • 静置下におけるフジノハナガイDonax semigranosus (Dunker)の潜砂に与える砂質土砂の粒径と形状の影響
  • セイチカ ニ オケル フジノハナガイ Donax semigranosus (Dunker)ノ センサ ニ アタエル スナシツ ドシャ ノ リュウケイ ト ケイジョウ ノ エイキョウ

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Abstract

<p>A series of burrowing experiments was conducted on a typical bivalve, Donax semigranosus, which lives in a sandy beach shoreline area, using sandy substrates of various particle sizes and shapes under standing conditions. As a result, the success rate of burrowing varied and decreased to below 30% when the particle diameter was over 0.8 mm and the vane shear resistance was less than 0.018 kN/m2 or greater than 0.14 kN/m2, or the friction coefficient tan Φ was less than 0.46 or greater than 0.88. This is thought to be due to the fact that the D. semigranosus cannot excavate the substrate with increasing hardness with a larger particle size over 0.8 mm under given dense packing states, and that the substrate is not strong enough to take the burrowing posture at low values of vane shear resistance and friction coefficient defined by tan Φ. In addition, it was considered that some individuals foot did not reach the substrate. These results suggest that the burrowing behavior of D. semigranosus is presumably adapted to sand dynamics in the shoreline area of the sandy shore, such as uprush and backrush, coastal gradients, and drifting sand.</p>

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