摘要:
在对南黄海和东海毛颚类生态特征的研究数量分布特征后的续篇.重点探讨调查区毛颚类群落性质和群落结构的特征及与海区环境因子的相关性.结果表明,本区共记录毛颚类28种,种类季节变化不明显,周年共有种达64.3%;但群落优势种则有季节差异与区域差异.毛颚类群落多样性指数(H')和均匀度(J')年均值分别为1.68和0.64.H'的平面分布表现出外部海区大于近岸海区的分布格局.在群落中存在4个生态类群,其中近海暖温带类群和广盐暖水类群可分别指示黄海水、浙江沿岸流和东海陆架混合水在南黄海和东海这两个海区的相互推移和消长过程.此外,从不同侧面的计算分析也表明,影响群落特征值(H')的主要因子是温度和盐度.群落性质是以近岸暖温带低盐种和暖水广布种为主,近岸暖水种和大洋暖水种占一定比例的暖温带-亚热带群落结构的特点.
Abstract:
On the basis of the investigation data of 12 cruises from December 1977 to November 1978 in water of southern Huanghai Sea and East China Sea(28°~34°N,120°30'~127°E),the features and structures of the Chaetognatha community and its relation to the environmental factors were discussed.It shows that there were little significant seasonal alternations of species composition in 28 species recorded,except for seasonal and regional differential in dominant species among the community.Diversity index (H') and evenness (J) of the Chaetognatha community was 1.68 and 0.64 (by annual average),respectively,with much diversified community in the open sea compared with that in the near sea region.Four ecological groups of Chaetognatha are identified,among which warm water neritic and warm water euryhaline are index species of the wane and wax of the Huanghia Seawater mass,coastal waters along Zhejiang and mixed waters from the continental East China Sea.Besides,the analyses show that the most import factor affecting the diversity (H') was temperature andsaline.In these communities,dominant species were mainly composted of warm water low saline neritic and warm water cosmopolitan in addition to some species of warm water neritic and warm water oceanic,which are characteristic of the structure of temperate-subtropical community.
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