土佐湾, 手結地先の異なる水深に生育するカジメの形態, 密度および現存量について

概要

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Ecklonia cava Kjellman grows on the rocky shore from low tide mark to a depth of approximately 15m at sites facing the open sea along the coast of Tei in Tosa Bay, Southern Japan. A monthly survey of the Ecklonia cava community was carried out at sites from 2-13m depth in dense kelp bed; 3-5m, 5-7.5m, 7.5-10m, 10-12.5m. The water temperature at the study site was 15℃ (in winter) and 26-28℃ (in summer). Salinity ranged among 33.5-35.5 PSU and was turbidity usually under 1.0. The average plant length (primary blade length and stipe length) of adult plants was 21.4-33.5cm, 4.0-11.4cm in the stipe length and 17.4-24.3cm in the primary blade length. Plants in 5-10m of water depth were longer than those in shallower or deeper plants. Stipe diameter, primary blade width, median fascia width and the longest bladelet length was 6.3-8.6mm, 5.0-5.4cm, 2.4-3.0cm and 19.7-33.7cm. Biomass was 1.8-4.1wet.w.kg/㎡ and density of adult plant was 19-31 indeviduals/㎡. Ecklonia cava growing in this area was smaller than that growing in the coast of the Izu and Shima peninsula, central Japan where water temperatures were cooler.
2000-03-01