. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. August 1948 1949 Aug Aug. 1951 Western half Sept 1948 1949 Aug Sept 1950 Aug. 1951 Eastern half Fig. 204. Annual fluctuations in the volume of river-discharge and in the biomass of nutrient zooplankton in the 0 to 25 m layer of the Black Sea. 1 Total discharge; 2 Summer floods; 3 Nutrient zooplankton biomass; 4 Penilia avirostris biomass (Kusmorskaya). different. Thus in 1955 a sharp decrease of food zooplankton and a mass development of the diatoms Rhizosolenia calcar-avis were observed.
. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. August 1948 1949 Aug Aug. 1951 Western half Sept 1948 1949 Aug Sept 1950 Aug. 1951 Eastern half Fig. 204. Annual fluctuations in the volume of river-discharge and in the biomass of nutrient zooplankton in the 0 to 25 m layer of the Black Sea. 1 Total discharge; 2 Summer floods; 3 Nutrient zooplankton biomass; 4 Penilia avirostris biomass (Kusmorskaya). different. Thus in 1955 a sharp decrease of food zooplankton and a mass development of the diatoms Rhizosolenia calcar-avis were observed. They may be the link in an inverse relationship. The same picture was observed in the Sea of Azov in the summer of 1955 (25 to 50 mg/m3 in July and August). A considerable mass of fish, chiefly anchovy, moved away from the north- western part of the Sea. The feeding conditions began to deteriorate in the northwestern part of the Black Sea after 1952. In 1954 the amount of food- plankton decreased by several times (E. Yablonskaya, 1957). In 1955 the Table 170. Annual and seasonal fluctuations in the biomass of food zooplankton in different parts of the Black Sea {A. Kusmorskaya, 1954) Month Open sea western half, 1949 0-100 m layer eastern half, 1951 Northwestern part 0-10 m layer, 1951 mg/m3 mg/m3 mg/m3 February April May June 60(1951) 65 51 25 18 42 599 July August September October 60 140 46 79 930 417 384 323 December — — —. 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
Size: 1815px × 1377px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity
