Tab. 1 + 2: Distribution chart of nannoplankton species record

Between March and April of 1986 a series of water samples were taken in the South Atlantic to study the Recent calcareous nannoplankton assemblages in that part of the world. South of Africa, in the transitional floral zone, most of the coecolithophorid flora elements characteristic of this zone were recognized but in addition influences from the floras of the Indian Ocean were distinguished as well as floral elements belonging to the tropical and subtropical floral zones. It is concluded that the transitional floral zone should be redefined on the basis of seasonal changes of the assemblages. In the cold waters between the Subtropic and the Antarctic Convergences near the Antarctic continent, calcareous nannoplankton is scarce. Only a monospecific assemblage of malformed Emiliania huxleyi was found. Probably the combination of cold water and high hydro energy levels prevents the development of adiverse coccolith-bearing nannoplankton assemblage. […]

在1986年3月至4月期间，为研究南大西洋地区的现代钙质浮游有孔虫群落，对该区域进行了系列水样采集。在非洲南部，过渡带植物群中，识别出了该区域特有的硅藻门植物群元素，同时亦辨别出了来自印度洋的植物群影响以及热带和亚热带植物群区的植物元素。据此，基于群落的季节性变化，应重新定义过渡带植物群。在接近南极大陆的副热带与南极辐合带之间的冷水区域，钙质浮游有孔虫较为稀少。仅发现了一种畸形Emiliania huxleyi的单种群聚。可能由于冷水环境与高水能水平相结合，阻止了多样性钙质有孔虫群落的形成。