半鹹水橈脚類に関する一考察
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概要
- 論文の詳細を見る
Cosmopolitanism is one of the well-known features of the fresh-water plankton in general. Some copepods such as Calanoida of inland waters, however, have more or less its own restricted geographical distribution. This phenomenon in these copepods may be explained from the fact that the adaptation or migration of these forms from sea to inland waters has taken place in an age comparatively recent. From this point of view, our attention may be drawn to the brackishwater copepods, because they may be regarded as the important links connecting those in the freshwaters with their fellows in the sea. In Eastern Asia, two series of such copepods are observed, one in the Yangtae-kiang Valley, Central China, and the other in the territories surrounding the Sea of Japan. These two series show an obvious parallelism, consisting of closely related species respectively. In this case, the Sea of Japan, in the early stage of its formation, seems to have played the same role as the estuary of the Yangtse-kiang in Central China.
- 日本生態学会の論文
- 1954-05-25