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OALib Journal期刊
ISSN: 2333-9721
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长江口不同水域浮游动物群落结构比较
DOI: 10.3724/SP.J.1145.2014.06037, PP. 88-95
Keywords: 长江口,浮游动物,群落结构,盐度,中华华哲水蚤,汤匙华哲水蚤
Abstract:
依据2009-2010年期间对长江口南支、北支、北港和长江口外水域春季和秋季海洋综合调查，对长江口不同水域的浮游动物群落进行比较.结果显示，春季长江口水域共出现浮游动物27种，其中南支出现11种，北支出现9种，北港出现5种，长江口外出现17种.秋季时长江口出现浮游动物71种，其中南支出现6种，北支出现11种浮游动物，北港出现8种，而长江口外共出现63种.种类数和多样性指数分布在春秋季均以长江口外为高值区，口内相对较低.长江口外水域的站位平均种类数在春季和秋季均为4个水域最高，且与其他水域之间有显著性差异（p<0.05）.南支和北支的站位平均种类数在春季和秋季差异性均不显著（p>0.05）.长江口外水域的站位平均多样度仍为春季（1.69）和秋季（3.73）最高，春季时北港站位平均多样度为各水域最低，秋季时南支多样度最低，仅为0.49.春季时，中华华哲水蚤（sinocalanussinensis）是南支、北支、北港的重要种类，其丰度百分比均高于50%且出现率均为100%，长江口外水域的重要种类为虫肢歪水蚤（tortanusvermiculus）和真刺唇角水蚤（labidoceraeuchaeta）.秋季时各水域重要种类各不相同，其中南支水域重要种类为汤匙华哲水蚤（sinocalanusdorrii），其出现率为100%，丰度百分比高达93.55%，其他水域的重要种类丰度百分比均不超过30%.本研究表明，盐度是影响长江口不同水域浮游动物群落差异的重要因素，水团和悬沙浓度等因素也对其有一定影响.
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