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长江口及邻近海域浮游介形类的分布与季节变化

DOI: 10.3724/SP.J.1145.2009.00072, PP. 72-77

Keywords: 浮游动物,介形类,优势种,丰度,长江口

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Abstract:

根据2002~2003年长江口29°00′~32°00′n、122°00′~123°30′e海域4个季节的调查,运用定量、定性方法,探讨了长江口及邻近海域浮游介形类总丰度的平面分布、季节变化、丰度变化与水团的关系,以及优势种的环境适应和优势种丰度对介形类总丰度的贡献;并与东海外海的分布特征进行了比较.结果表明,该海域浮游介形类总丰度具有明显的季节变化,春季最高,夏季次之,秋季最低.四季多样性指数(h’)均低于2,其中冬季最高,夏季最低.共出现浮游介形类20种,春季最多(16种),秋季最少(3种).四季皆为优势种的仅有短棒真浮萤(euconchoeciachierchiae),其它的主要有后圆真浮萤(e.maimai)和针刺真浮萤(e.aculeata)等.春季的后圆真浮萤和冬季的短棒真浮萤对总丰度的贡献最大(β>0.90).短棒真浮萤的分布对总丰度的季节变化有重要影响,由此形成介形类特有的变化特征.图5表3参20

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