Abstract
This study dealt with the influence of chlorinity on the growth of Skeletonema costatum, which was collected from the Yatsushiro Sea and Dokai Bay, in the laboratory culture. The culture was kept in the incubator at six different temperatures.Two types of cultivation showed good growth at 25°C and the optimal chlorinity ranged from 14.8‰ to 20.1‰, in Yatsushiro type, and from 12.7‰ to 20.1‰ in Dokai type. At the other temperatures, the range of optimal chlorinity was found to show a little variation in each type.The cell diameter and the length of pervalvar axis varied with the chlorinity and the temperature, and it was found that there was a striking difference in the two types.Therefore, it was considered that both types of S. costatum were ecotypes adapted to the different water quality at the collecting stations.
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