朝鮮海峽に於ける暖流性プランクトンの分布と海況とに就て

抄録

At the beginning of June, 1932, a series of simultaneous oceanographical investigations in the Japan Sea were carried out by the fishery experiment stations located on the shores surrounding it, and plankton samples were collected at every observation station. I worked with the samples which were collected from the se between Kyûshû and southern Tyôsen, and divided this area according to the distributions of the temperate plankton into 4 regions: A, B, C, and D. In the material from “A, ” I found subtropical plankton such as Ceratocorys horrida S_TEIN, Stroptotheca indica K_ARSTEN, Calocalanus ?? pavo D_ANA, Candacia ethiopica D_ANA, Candacia truncata D_ANA, Centropages gracilis D_ANA, Centropages furcatus B_RADY, Labidocera acnta D_ANA, Lab. detruncata D_ANA, Phaenna sp., etc., and thus I am inclined to think that this region is greatly influenced by the warm current “kuro-siwo.” The above-mentioned species could not be found in the samples from the “B” region, where a number of species of temperate oceanic plankton were seen. In the region “C, ” I saw many cosmopolitan temperate plankton, such as Oithona plumifera B_AIRD, Evadne tergestina C_LAUS, Penilia schmackeri R_ICHARD, Doliolum nationalis B_ORGERT, Chaetoceros spp., Rhizosolenia spp., Ceratium spp, etc., and some kinds of neritic plankton which seem to point to the conclusion that the coastal water of the southern part of the Yellow Sea or of the East China Sea influenced this area. In the region “D, ” I found none of the temperate oceanic plankton, and judging from the constituents of the plankton I consider that the water from the southern Yellow Sea or from the eastern China Sea flows into this region. The findings of the plankton material as given above coincide well with the distributions of the temperature and the salinity in these waters.