This is less than the total biological production in the main water column, or pelagic zone.
它比主水体或远洋区的生物总产量要少一些。
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％；
This is less than the total biological production in the main water column, or pelagic zone, which scientists believe to be between around 0.6 and 1.8 gigatonnes of carbon per year.
它比主水体或深海区动物产物——科学家们认为，其总数在每年约6千万到1亿8千万吨碳——的总数要少。
This is less than the total biological production in the main water column, or pelagic zone, which scientists believe to be between around 0.6 and 1.8 gigatonnes of carbon per year.
它比主水体或深海区动物产物——科学家们认为，其总数在每年约6千万到1亿8千万吨碳——的总数要少。
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