. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. 598 BIOLOGY OF THE SEAS OF THE A remarkable coincidence between quantitative development of zoo- plankton and of bacterial flora is evident from the data gathered by Kusmor- skayr (1938). On the cross section Volga delta-Mangistau maximum numbers of micro-organisms and zooplankton are found together, falling exactly within the area of confluence of river and sea waters (Fig. 283). The same coin- cidence was recorded for Mertvyi Kultuk and Kaidak. It might reflect both MICRO- ORGANISMS 1600
. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. 598 BIOLOGY OF THE SEAS OF THE A remarkable coincidence between quantitative development of zoo- plankton and of bacterial flora is evident from the data gathered by Kusmor- skayr (1938). On the cross section Volga delta-Mangistau maximum numbers of micro-organisms and zooplankton are found together, falling exactly within the area of confluence of river and sea waters (Fig. 283). The same coin- cidence was recorded for Mertvyi Kultuk and Kaidak. It might reflect both MICRO- ORGANISMS 160000- 140000- 120000- WO 000 80000 60000 40000 20000 10000 ZOOPLANKTON 70 NUMBER OF MICRO-ORGANISMS (COLONIES) ZOOPLANKTON BIOMASS mg/m 60 50 ? 0 30 20 10. Fig. 283. Quantitative distribution of bacteria and zooplankton along the cross section Volga delta-Mangistau (Kusmorskaya). an indirect and a direct dependence of zooplankton on micro-organisms. Micro-organisms decompose organic matter and enrich the waters with plant food. The development of phytoplankton biomass is due to it; this in its turn serves as food for zooplankton. Moreover plankton Copepoda feed directly on micro-organisms, and bacterial flora is used to feed zooplankton. Taking Knipovitch's value of 793 km3 as the volume of the Northern Caspian, Kusmorskaya calculated the absolute amounts of zooplankton bio- mass and has obtained indices for the whole Northern Caspian as given in Table 246. Zooplankton biomass of Central and Southern Caspian. Quantitative data on Central and Southern Caspian zooplankton are contained in the works of M. Idelson (1941) and V. Jashnov (1938, 1939). According to Idelson the largest zooplankton biomass is found in the 0 to 100 m layer; below that it decreases regularly with depth (Table 247). The relationship between separate groups changes simultaneously (Fig. 284). Copepoda are the dominant groups in the 0 to 100 m layer, comprising 96 to 99 per cent of the total biomass in the Cent
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