BENTHIC FORAMINIFERAL DISTRIBUTION IN SURFACE SEDIMENTS OF ZHUJIANG ESTUARY AND ITS ENVIRONMENTAL IMPLICATIONS
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摘要: 对珠江口134个站位的表层沉积物进行底栖有孔虫分析,共发现底栖有孔虫68属106种,其中玻璃质壳48属65种,瓷质壳17属21种,胶结壳3属20种。有孔虫丰度、种数和分异度都基本表现为由河口向外海迅速增加。对有孔虫属种数据使用因子分析,前3个因子解释了总方差的86.2%,根据有孔虫属种因子得分情况,将有孔虫划分为Ammonia beccarii-Elphidium nakanokawaense亚组合、Ammonia beccarii-Haplophragmoides canariensis亚组合和Hanzawaia nipponica-Elphidium advenum-Ammonia compressiuscula组合。底栖有孔虫分布与环境有较大的关系,水深和盐度控制了底栖有孔虫分布和种群组成,底质类型、水动力条件和沉积速率也对有孔虫的生态结构带来了影响。Abstract: 134 grab surface sediments were collected from the Zhujiang River estuary with the support of projects 908-01-CJ14 and 908-01-CJ15. In the sediment samples discovered are 106 benthic foraminiferal species belonging to 68 genera and 3 suborders, including 65 Hyaline, 21 porcellaneous and 20 agglutinated species. Benthic foraminiferal species at different locations of the Zhujiang River estuary is examined for abundance, number of species and compound diversity H(S). Foraminiferal abundance, number of species and diversity increased rapidly from the estuary to shallow sea. Foraminiferal abundance changes from several to tens of thousands; number of species changes from 1 to 48 and diversity does from 1 to 3. Factor analysis and Pearson correlation matrix was performed on foraminiferal census data of species content higher than 2% which are present in at least three samples. 3 factors were obtained accounting for 87.2% of the total variance. Two benthic foraminiferal subgroups and one group, Ammonia beccarii-Elphidium nakanokawaense subgroup、Ammonia beccarii-Haplophragmoides canariensis subgroup and Hanzawaia nipponica-Elphidium advenum-Ammonia compressiuscula group, were classified according to factor score of foraminiferal genus. Further, there is some kind of relationship between the foraminaferal distribution and environment. Water depth and salinity control foraminiferal distribution and community structure, and sediment type, water dynamics and sedimentary rate affect its ecological structure as well.
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Key words:
- surface sediments /
- benthic foraminifera /
- factor analysis /
- the Zhujiang River estuary
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