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Monthly surveys of phytoplankton occurrence were conducted from 1974 to 1986 at six stations in the brackish lake Nakanoumi. Both the numbers of phytoplankton cells and species tended to increase during the period when T-N concentration sharply increased, and decreased during the period when T-N concentration remained at the same level or gradually decreased.Among the four diversity indices for the phytoplankton community (i.e., Fatten, Shannon, Simpson and Margalef), only the Margalef index showed a highly positive correlation (coefficient > 0.7) with the yearly changes of the nutrient (T-P or T-N) concentration at some stations.

Relationship between the yearly changes in phytoplankton occurrence and nutrient concentration in brackish Lake Nakanoumi, 1974-1986.