. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. 824 BIOLOGY OF THE SEAS OF THE even at the 25 m horizon (Fig. 415) and even more so in the temperature near the bottom (Fig. 416). The salinity of the western and eastern parts of the Sea is practically the same—about 32 or 33%0; it remains practically unchanged from surface to bottom. The phosphorus content of the Bering Sea waters is sufficient for the luxu- riant development of phytoplankton (Fig. 417). The changes of temperature of water layers from the surface to the 200 to /60' 68T no
. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. 824 BIOLOGY OF THE SEAS OF THE even at the 25 m horizon (Fig. 415) and even more so in the temperature near the bottom (Fig. 416). The salinity of the western and eastern parts of the Sea is practically the same—about 32 or 33%0; it remains practically unchanged from surface to bottom. The phosphorus content of the Bering Sea waters is sufficient for the luxu- riant development of phytoplankton (Fig. 417). The changes of temperature of water layers from the surface to the 200 to /60' 68T no. 60°- 50' 160- . ?*? *4j: 50' 170< 180° /70? 160? Fig. 415. Isotherms of the Bering Sea in 1932 at a depth of 25 m (Ratmanov). 300 m level are clearly shown on the cross section from Cape Africa eastward. Cold Kamchatka waters are pushed to the western side. At a depth of 300 to 400 m these differences are already indistinct (Fig. 418). The water masses of the Bering Sea may be divided into four layers accord- ing to their chemical properties (V. Mokievskaya, 1956): (7) the surface layer, most exposed to seasonal fluctuations of temperature, salinity and chemical properties; (2) the transition zone, which becomes thicker in spring and summer (50 to 200 m) while its boundaries become less pronounced; (3) a third layer, characterized by a lower oxygen content, down to 10 to 15 per cent of saturation, and the highest phosphorus content (over 100 mg/m3). 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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