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huang dong hai ji lin jin shui yu fu you you kong chong di li qu hua de chu bu tan tao
Pages: 207-214
Year: Issue:  3
Journal: Oceanologia et Limnologia Sinica

Keyword:  浮游有孔虫邻近水域东海地理区划浮游动物表层水温区系黑潮分布区外海;
Abstract: The boundary of the geographic distribution of planktonic organisms shifts with the-seasonal change in the direction and intensity of currents. A reliable delineation of the geographic regions of planktonic organisms should be based on data which represent the effect of long-standing interacting environmental factors. The dead tests of planktonic. Foraminifera, having accumulated on the sea floor over a long period are a reflection of the sum of the ecologic factors acting upon them and are therefore more reliable than their living counterparts, collected within a limited period, as a basis for delineating their geographic regions.The planktonic Foraminifera found in our seas comprise about 29 species. In the South China Sea, there are 28 species, in the East China Sea, there are 25 species of which only 3. species are distributed up to the South Yellow Sea. In the North Yellow Sea and Pohai, we have not as yet encountered any planktonic species. With the exception of one species, Globigerina bulloides d'Orbigny, which is a widely-distributed temperate species, all are characteristic of warm water and none of cold water. From the point of view of faunal characteristics, the planktonic foraminiferal fauna of our seas, of southern Japan, of the Philippines and of adjacent waters are very similar to that of the equatorial west central fauna.It is apparent from our data and from those of other authors that the front of the Kuroshio current and its branches corresponds roughly to the northern limit of distribution of tropical planktonic Foraminifera, at the same time, to the southern boundary of the temperate fauna of the North Pacific. Between the first and second fronts of the Kuroshio is a transition region populated by eurythermal tropical and temperate planktonic species.Based on species composition, relative abundance and ecological characteristics, the distribution areas of planktonic Foraminifera of the Yellow Sea, the East China Sea and adjacent waters may be delimited into the following regions:Region Ⅰ--is the basic area of distribution of tropical planktonic Foraminifera.This region includes the South China Sea, the off-shore waters of the East China Sea and the waters southeast of Japan, south of latitude 36°N. Its northern boundary roughly coincides with the 15℃ mean winter surface-water isotherm.Region Ⅱ--is the extent of the seasonal northward shift of the distribution areaof planktonic Foraminifera. Its northern boundary, represented by a line extending from the Chusan Archipelago, curving upward to the vicinity of Saishu-to and extending across the Chosen Strait up to the vicinity of Niigata, Japan, roughly coincides with the 10℃ mean winter surface-water isotherm.Region Ⅲ--is a rather closed area where planktonic Foraminifera are very rareor absent. This region includes the entire Yellow Sea and Pohai. Its southern boundary coincides roughly with the 10℃ mean winter surface-water isotherm.Region Ⅳ--is the distribution area of boreal planktonic Foraminifera. It includes the greater part of the sea of Japan which is under the influence of the Liman current.Region Ⅴ--is also the distribution area of boreal planktonic Foraminifera. It in-cludes the region northeast of Honshu and of the Tsugaru Strait. Its southern boundary roughly coincides with the northern boundary of the region of mixing of the Oyashio and the Kuroshio.Region Ⅵ--is the region of mixing of tropical and boreal planktonic Foraminifera. It includes the area south of the Tsugaru Strait and north of Inuboe-2aki and corresponds roughly to the region of mixing of the Kuroshio and the Oyashio.
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