Abstract
Recently, the collapse of ecosystem balance caused by the dominant multiplication of single species is focused in various artificial tidal flats. In this study, it was investigated that the causes of extraordinary distribution of the chlorophyceae, especially Ulva sp. in Yatsu tidal flat, and the environmental factors composed with water quality.As the result, the ratio (CN/CP) on the concentration between NH4-N and PO4-P was estimated at the average value as 4.2 by the onsite investigation in two canals connected Yatsu tidal flat and Tokyo Bay. Otherwise, the optimum ratio for growth of Ulva sp. was detected as 4.25 by the culture experiment operated in our laboratory. It is considered for the reason to be extraordinarily distribution of Ulva sp. in Yatsu tidal flat, that the ratio in the field is similar value as the optimum value for growth of Ulva sp.The ratio control in two canals and the shift from the optimum value for growth of Ulva sp. are considered to be efficiency method for the restraint of the irregular growth/distribution of Ulva sp.
Published Version
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