浙江北部海域的具齿原甲藻赤潮分析

Analysis on the red tide of Prorocentrum dantatum in the north coastal water of Zhejiang

对2003年5月浙江北部沿海海域的一次具齿原甲藻赤潮进行了调查分析,结果表明:细胞数106/L是具齿原甲藻发生赤潮的临界值,赤潮生物数量与DO、COD、叶绿素a、被囊类及水母有较好的正相关作用,与桡足类、箭虫类则呈相反的走势,具齿原甲藻赤潮的暴发及持续并不需要过高的营养条件,其连续、大规模的发生估计与海洋渔业资源及生态系统的变迁有着密切的联系。

The red tide of Prorocentrum dantatum occurred in the north coastal water of Zhejiang in May, 2003 was analyzed. The result showed that the abundance of 10^6/L of P. dantatum is critical value for red tide occurrence. The algae abundance showed the positive correlation with DO, COD, Chla, Tunicata and Coelanterate, and the opposite trend with Copepoda and Chaetognatha. The occurrence of red tide of P. datatum does not need the high level concentration of nutrient salt. The occurrence in series and large-scale may be relation with changes of marine fishery resource and marine ecosystem.