闽南-台湾浅滩表层沉积物中底栖有孔虫分布及其环境特征

BENTHIC FORAMINIFERA IN THE SURFACE SEDIMENTS OF THE MINNAN-TAIWAN BANK REGION AND ITS ENVIRONMENTAL CHARACTERISTICS

本文分析了闽南-台湾浅滩表层沉积物样品中的底栖有孔虫计有132属、328种。根据种类组成及分布特征,可将海区划分为6个动物群区,每个动物群区各有自己的环境特点。文中分析了动物群种类组成特征与其所赋存的环境之间的关系,并讨论了浅滩西南303站底栖有孔虫的分布与上升流的关系。

In the present paper 37 samples collected from the surface sediments of the Minnan-Taiwan Bank were analyzed. In all 328 benthic foraminiferal species belonging to 132 genera are identified . According to their composition and distribution, six benthic foraminiferal fauna can be established:Ⅰ. Ammobacuities formoensis-Arenoparrella asiatiea fauna ; Ⅱ. Quinqueloculina centrostriata-Textularia foliacea fauna; Ⅲ. Pararotalia ozawai-Poroeponides lateralis fauna, it can be divided into two groups (Ⅲa andⅢb);Ⅳ. Cibicides lobatulus-Hanzawoaia mantaensis fauna, two groups (Ⅳa and Ⅳb) can be identified;Ⅴ . Robulus calcar-Gyroidina neosoldanii fauna; Ⅵ. Ammonia parkinsonina-Elphidium advenum fauna. In the Ⅲa, Ⅲb and ⅣFa fauna, every station,has identical dominant species which numbers make up the first three places. However , the Ⅰ and Fb fauna are defined by the range of some species only found in these area. There are different characteristics of environment in every fauna. Along with the water depth, the salinity and hydrodynamics are the important controlling factors for distribution of benthic foraminifera. At station 303 located in the southwest of the Taiwan Bank, both distribution of benthic foraminifera and sediments are found evidently different from the adjacent area with similar depth . It might be resulted by the influence of upwelling which exists in this area over a long period of time.