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The mean wet weight per algae cell is reduced by 63. 6% in pelagic zone and 75. 4% in bay area after an interval of about 7 years. 藻类种类小型化现象十分明显，相隔6～7年，小型藻类的种类及其数量越来越多，单个藻细胞鲜重的平均值在敞水区和库湾区分别减少了63.6％和75.4％；