. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. GENERAL CHARACTERISTICS OF FAR EASTERN SEAS 723 Table 295. Changes in benthos biomass with depth (Ya. Birstein and G. Belyaev, 1955) in northwestern part of Pacific Ocean Depth, m Coastal zone 50-200 950^1,070 5,070-7,230 8,330-9,250 Kuril-Kamchatka 5,000-6,000 Central part of ocean bed Biomass g/m2 1,000-5,000 200 6-94 1-22 0-32 0010 The considerable difference between the variations of the biomass of plank- ton and of benthos, either in the direction from the coast to the open ocean or from the s
. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. GENERAL CHARACTERISTICS OF FAR EASTERN SEAS 723 Table 295. Changes in benthos biomass with depth (Ya. Birstein and G. Belyaev, 1955) in northwestern part of Pacific Ocean Depth, m Coastal zone 50-200 950^1,070 5,070-7,230 8,330-9,250 Kuril-Kamchatka 5,000-6,000 Central part of ocean bed Biomass g/m2 1,000-5,000 200 6-94 1-22 0-32 0010 The considerable difference between the variations of the biomass of plank- ton and of benthos, either in the direction from the coast to the open ocean or from the surface into its depths, is due apparently to the multiplication of benthos being more closely dependent on the shore than is that of zooplank- ton. The latter depends much more on phytoplankton, the development of which in its turn is determined by the nutrient salts, the system of vertical mixing which brings them from the depths to the surface, and by the general conditions of lighting. Two diagrams may serve to illustrate this; first the qualitative distribution of life through a cross section of the Kuril-Kamchatka trench (Fig. 349). The amount of plankton decreases from 400 to 30 mg/m3 from the neretic zone to the oceanic (I). The increase (to 500 mg/m3) corresponds to the in- crease of plankton biomass towards the zone of convergence of the cold and warm waters. Throughout the same field the benthos biomass (II) decreases. Fig. 349. Diagram of quantitative changes in plankton and benthos south-east of the Kuril chain (Zenkevitch). / Plankton; // Benthos; /// Bottom topography (cross section of Kuril-Kamchatka trench).. 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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