. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. NEMERTINI AND SYNCESMA CARDIUM EDULE 1DOTHEA G. IOCUSTA AND NEREIS DIVERSICOLOR HYDROBIA ?-•-•- OSTRACODA CHIRONOMIDAE ^^CLADOPHORA EPHYDRA ARTEMIA SALINA. Fig. 252. Limit of distribution in the depth of the Sivash of some Azov-Black Sea forms (Vorobieff). Fig. 253. Northern boundary of distri- bution of ultrahaline forms in the Sivash (Vorobieff). Vorobieff gives the number of animal and plant species inhabiting various parts of the Sivash as in Table 221. Of the 40 species of zoobenthos in the Si
. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. NEMERTINI AND SYNCESMA CARDIUM EDULE 1DOTHEA G. IOCUSTA AND NEREIS DIVERSICOLOR HYDROBIA ?-•-•- OSTRACODA CHIRONOMIDAE ^^CLADOPHORA EPHYDRA ARTEMIA SALINA. Fig. 252. Limit of distribution in the depth of the Sivash of some Azov-Black Sea forms (Vorobieff). Fig. 253. Northern boundary of distri- bution of ultrahaline forms in the Sivash (Vorobieff). Vorobieff gives the number of animal and plant species inhabiting various parts of the Sivash as in Table 221. Of the 40 species of zoobenthos in the Sivash 18 (39-9 per cent) are Novo- Euxine relicts, 5 (11-1 per cent) are ultrahaline forms, 19 (42-2 per cent) are Azov-Black Sea forms and 3 (6-7 per cent) are ancient Euxine relicts. Of the 75 species of zooplankton 6 (7-98 per cent) are Novo-Euxine relicts, 9 species (12-9 per cent) are ultrahaline forms, 59 (79-4 per cent) are Azov- Black Sea forms and 1 (1-33 per cent) is a Novo-Euxine relict. The occasional drying up by the wind of large areas of the bottom is a characteristic pheno- menon of the Sivash; one part of its fauna perishes, while another develops the ability to survive the dry periods by burrowing into the sea-bed. Plankton Plankton distribution, according to Vorobieff, is as set out in Table 222. Plankton biomass throughout the Sivash comprises 22,440 tons in February, Table 221 Group Sections of Sivash 1st northern 2nd northern Central Southern Benthos Zooplankton Phytoplankton Fish 40 38 56 55 43 70 53 9 5 23 34 1 2 9 16. 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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