. Biology of the seas of the U.S.S.R. Marine biology -- Soviet Union; Hydrology -- Soviet Union. 316 BIOLOGY OF THE SEAS OF THE U.S.S.R. The region of the typical Baltic mesomixed and oligomixed communities only begins, however, east of the Darss ridge (Fig. 151). This ridge may in fact be called a distinct quantitative-biocoenotic boundary (I. Valikangas, 1933). The quantitative researches of the Swedish investigator G. Thulin (1922), and of the Polish workers under K. Demel (1935, 1951, 1954), covered the Arcona and Bornholm depressions, and in addition Demel's investigations covered all mo
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. Biology of the seas of the U.S.S.R. Marine biology -- Soviet Union; Hydrology -- Soviet Union. 316 BIOLOGY OF THE SEAS OF THE U.S.S.R. The region of the typical Baltic mesomixed and oligomixed communities only begins, however, east of the Darss ridge (Fig. 151). This ridge may in fact be called a distinct quantitative-biocoenotic boundary (I. Valikangas, 1933). The quantitative researches of the Swedish investigator G. Thulin (1922), and of the Polish workers under K. Demel (1935, 1951, 1954), covered the Arcona and Bornholm depressions, and in addition Demel's investigations covered all mo 102-5. 31-11. 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 work.. Zenkevich, L. A. (Lev Aleksandrovich), 1889-1970. New York, Interscience Publishers