BENTHIC FORAMINIFERAL ASSEMBLAGES IN THE HYPOXIC AREA OF YANGTZE RIVER ESTUARY
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摘要: 对全球低氧区的分布、形成机制以及低氧区海水表层特征、海底地球化学特征、生物特征等进行了系统的描述。着重对全球低氧区的底栖有孔虫特征进行了分析、对比,并与长江口底栖有孔虫特征相结合,讨论适合指示长江口低氧区的底栖有孔虫组合,初步分析认为Epistominella naraensis(奈良小上口虫)、Bulimina marginata(具缘小泡虫)、Bolivina spp.(箭头虫诸种)、Florilus spp.(花朵虫诸种)、Ammonia spp.(卷转虫诸种)以及Bulliminella spp.(微泡虫诸种)为长江口低氧区的敏感种,具有低氧环境的指示意义,并可以作为古低氧事件研究的标志。但实际应用时应根据研究需要取合适的属种组合使用。Abstract: In this paper, we described the spatial distribution of the hypoxic zone in the world and discussed its formation mechanisms, sea surface features, and seabed geochemical and biological characteristics. The benthic foraminiferal assemblages found in the Yangtze River Delta were compared with those in the hypoxic areas of the world. It is found that the species of Epistominella naraensis, Bulimina marginata, Bolivina spp., Florilus spp., Ammonia spp. and Bulimina spp. are sensitive species in the hypoxic zone of the Yangtze River estuary and can be used as a proxy to denote a low oxygen environment for study of the hypoxic events in the history. However, selection of right foraminiferal assemblages is required before environmental interpretation is made.
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Key words:
- Yangtze River /
- hypoxia /
- foraminifera /
- benthic foraminiferal assemblages
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