Densities of Skeletonema costatum and its environmental factors were investigated in Zhelin Bay from May 2000 to June 2002. Our results showed that densities of S. costatum were greater in the inner bay than those in the outer bay, however one peak was observed in a typical annual dynamics monitoring. The relationship between densities of S. costatum and the environmental factors was studied by correlation analysis. Both N and P are likely to be the limit factors for S. costatum, especially P.
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