. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. THE SEA OF AZOV 513 several years, and Mytilaster was almost completely replaced by Cardium. The increase of benthos up to 1947 was mostly due to Cardium (Fig. 241). The amount of benthos continued to decrease, and by the autumn of 1948 its mean biomass was reduced to 106 g/m2 in the northern part of the Sea of Azov. In Stark's opinion these changes in the quantitative composition of the benthos may have been partly the result of silting, linked with the abundance. kwto Fig. 241. Bottom biocoenoses
. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. THE SEA OF AZOV 513 several years, and Mytilaster was almost completely replaced by Cardium. The increase of benthos up to 1947 was mostly due to Cardium (Fig. 241). The amount of benthos continued to decrease, and by the autumn of 1948 its mean biomass was reduced to 106 g/m2 in the northern part of the Sea of Azov. In Stark's opinion these changes in the quantitative composition of the benthos may have been partly the result of silting, linked with the abundance. kwto Fig. 241. Bottom biocoenoses of the Sea of Azov (occurrence at the stations (Stark, I960)). 1 Mytilaster; 2 Cardium; 3 Brachynotus; 4 Syndesmya; 5Balanus; 6 Hy- drobia; 7 Nereis; 8 Corbulomya; 9 Nephthys. of flood waters in 1937-39, which had an unfavourable effect on fauna which avoids soft mud bottoms (Mytilaster, Balanus and others). Bottom-fauna of the Gulf of Taganrog varies considerably from year to year; Stark (1955), as well as Mordukhai-Boltovskoy (1948), connects these fluctuations with the changes in the spring floods of the river Don. During the years 1933-35 Cardium, Balanus, Hydrobia and other more salt-loving species were widely represented in the benthos. Those were years of low spring floods. In 1948, when floods were high, the role of these forms became insignificant, but after the exceptionally low floods of the Don in 1949 and 1950 a pro- nounced increase of marine fauna, principally the inferior food forms Balanus 2k. 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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