辽东湾表层沉积中有孔虫介形虫研究

对辽东湾的８８个表层沉积样品中的有孔虫介形虫进行了定性和定量分析，共得有孔虫４４属８７种，介形虫２４属３４种，按其分布范围的差异分为３个有孔虫介形虫组合；并探讨了组合与沉积环境的关系。

A Preliminary Study of Foraminifera and Ostracod Assemblages in the Liaodong Bay

About 88 samples of bottom sediments taken from the Liaodong Bay have been examined to determine the horizontal distribution of the foraminiferal and ostracodpopulations. Three major assemblages are recognized:(1)Ammonia beccarii var.-Neomonoceratina assemblage consists of euryhaline andbrackish-water species and Occurs in near-shore areas with water depth less than 20m. (2)Protelphidium tuberculatum-Sinocytheridea assemblage is made up of botheuryhaline and normal shalow-sea type and is distributioned in the near-shore areas between the 20-30m water depth. (3)Amnohia compressiuscula-Munseyella assemblage is composed of numerousnormal shallow-sea species and distributed over the central and southeast part of theBay. The microfauna from the Liaodong Bay is compared with that from the neighbou-ring areas, which is show that all species of recent Foraminifera and Ostracoda foundin the bay occur also in the present Bohai Gulf and Huanghai Sea. he Liaodong Bay is just like the semi-closed character of the Boliai Gulf, withoutplanktonic foraminifera and there are numerous stenohaline foraminifera which aredistributed in the more open-sea environments of the East China Sea and the HuanghaiSea. The distribution pattern of Foraminifera and Ostracode are controlled mainly bytwo distinct kinds of water masses with different salinity and temperatlire. The bottomsediments seem to be also an important controlling factor.