. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. THE BARENTS SEA 143 communities reach the edge of their habitat; they are absent from the eastern and northern parts of the Barents Sea. In the biocoenosis Modiola modiolus-Pecten islandicus, the polychaetes Thelepus cincinnatus, the Ophuroidea Ophiopholis aculeata, Balanus balanus, the sea-urchin Strongylocentrotus droebachiensis and some Bryozoa are the. Fig. 56. Composition of main bottom bio- coenoses of Barents Sea (Brotzkaya, Zenke- vitch and Filatova). / Porifera; II Central; III Eastern (me
. Biology of the seas of the Marine biology -- Soviet Union; Hydrology -- Soviet Union. THE BARENTS SEA 143 communities reach the edge of their habitat; they are absent from the eastern and northern parts of the Barents Sea. In the biocoenosis Modiola modiolus-Pecten islandicus, the polychaetes Thelepus cincinnatus, the Ophuroidea Ophiopholis aculeata, Balanus balanus, the sea-urchin Strongylocentrotus droebachiensis and some Bryozoa are the. Fig. 56. Composition of main bottom bio- coenoses of Barents Sea (Brotzkaya, Zenke- vitch and Filatova). / Porifera; II Central; III Eastern (medium depths); IV Eastern lit- toral ; V Northern littoral; VI Northern (deep water); VII Waldheimia-Brisaster. I Lamelli- branchiata; 2 Gephyrea; 3 Crustacea; 4 Coe- lenterata; 5 Polychaeta; 6 Echinodermata; 7 Porifera; 8 Sipunculoidea; 9 Gastropoda; 10 Tunicata; 11 Brachiopoda; 12 Varia. Average biomass is given in numerals (g/m2). most important. This biocoenosis is distributed mainly over large-grain sand and shale gravel, in zones of the constant ebb and flow of tidal streams. V. Zatzepin and Z. Filatova (1945) have noted that in summer these com- munities keep to waters of 6° to 10° and in winter to 0-5° to 2-5°; large growths of macrophytes are frequently met, among them the branched Litho- thamnion (red algae). On the Murman coast the biomass of Modiola bio- coenosis reached 1 to 1-5 kg/m2 (an average of 350 g/m2). Proceeding west- ward and southward the biocoenosis changes its qualitative composition— its cold-water forms such as the molluscs Saxicava arctica, Pecten islandicus. 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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