Distribution of fresh water diatom valves in the surface sediments off the Tokachi-gawa, Teshio-gawa and Ishikari-gawa, Hokkaido, Japan

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  • 北海道の十勝川・天塩川・石狩川沖の表層堆積物における淡水生珪藻遺骸の広がり
  • ホッカイドウ ノ トカチガワ テシオガワ イシカリガワオキ ノ ヒョウソウ タイセキブツ ニ オケル タンスイセイ ケイソウ イガイ ノ ヒロガリ

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Abstract

Surface marine sediments seaward of the Tokachi-gawa, Teshio-gawa and Ishikari-gawa, the three biggest rivers in Hokkaido, were analysed to determine the distribution of fresh-water diatom valves that were transported to the sea by the rivers. Samples were collected from marine sediments a few cm below the seafloor. Three relationships with the percentage of fresh water valves were examined 1) distance from the river mouth, 2) distance from shore line, and 3) water depth. The results of this investigation show that the percentage of fresh water diatom valves gradually decreases offshore from river mouths, and author believes their distribution being inferred to be controlled by sea water is a significant datum for the current research in coastal area.<br>

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