. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. THE SEA OF JAPAN 763 for the 0 to 100 m layer. Calanus tonsus was also greatly developed (45 per cent of the total plankton biomass). As early as June diatomaceous plankton was replaced by peridinians (some species of the genera Peridiniwn and Ceratium); among the zooplankton Paracalanus parvus was intensely developed. The amount of zooplankton increased to 350 mg/m3, and with the warming of the surface water Calanus for phytoplanKton for zoopLanKton 3000 CO4. wo 200 - Fig. 378. Vertical distributi
. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. THE SEA OF JAPAN 763 for the 0 to 100 m layer. Calanus tonsus was also greatly developed (45 per cent of the total plankton biomass). As early as June diatomaceous plankton was replaced by peridinians (some species of the genera Peridiniwn and Ceratium); among the zooplankton Paracalanus parvus was intensely developed. The amount of zooplankton increased to 350 mg/m3, and with the warming of the surface water Calanus for phytoplanKton for zoopLanKton 3000 CO4. wo 200 - Fig. 378. Vertical distribution of plankton biomass (mg/m3) in Sea of Japan from 31 March to 2 June 1939. 1 Phytoplankton (Coscinodiscus); 2 Zooplankton; 3 Calanus tonsus (Kusmorskaya, 1950). tonsus became the main form. In 1937 the zooplankton biomass in the same area, at the same season, was three times greater (1,300 g/m3) (K. Brodsky, 1939), and in 1936 it had even reached 1,640 mg/m3. The greatest concen- tration of zooplankton is found at a depth of 24 m (Fig. 378). Phytoplankton consists almost exclusively of Coscinodiscus oculis iridis, while half the zoo- plankton consists of Calanus tonsus—the main food of sardines in the Sea of Japan. In the opinion of many investigators the sardine catastrophe of 1939 was the result of an exceptional fall of temperature in the sardine spawning area and also of the consequential scarcity of food for the newly-hatched Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Zenkevich, L. A. (Lev Aleksandrovich), 1889-1970. New York, Interscience Publishers
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