植物プランクトンの富栄養階級表〔植物プランクトンを用いた海域の富栄養度判定-1-〕

概要

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New biological indicator system etc. according to phytoplankton was proposed for classification of eutrophic level in marine region. The dominant phytoplankton were examined in various marine regions and classified into four eutrophic levels (oligotrophic, eutrophic, extremely eutropic and saprobic regions) mainly according to physico-chemical properties of water and sea bed in the summer stratification period. As a result, the dominant phytoplankton were divided into four groups as follows. Thirtysix species of so-called oceanic plankton such as Trichodesmium erythraeum, T. thiebautii, Ceratocorys horrida, and Hemiaulus hauckii were ranked as oligotrophic group. Fifty-two species of neritic plankton, such as Ceratium furca, Gymnodinium nelsonii, and Chaetoceros curvisetus were ranked as eutrophic one. A flagllata Olisthodiscus sp. (3, 000 cells/ml<) and a diatom Skeletonema costatum (8, 000 cells/ml<) were ranked as extremely eutrophic group. The saprobic species could not be selected.
日本水産學會の論文