150 BIOLOGY OF THE SEAS OF THE U.S.S.R, 



Table 63 



The northern part of the Barents Sea and the central parts of the Kara Sea, 

 with its soft brown silts and depths of 200 to 450 m, are occupied by a bio- 

 coenosis with a large admixture of high Arctic forms. The dominant ones are 

 Astarte crenata and Ophiopleura borealis, the characteristic members of the 

 first order being Ophiocantha bidentata and Molpadia sp. (a high Arctic species 

 different from Molpadia of the southwestern part of the Sea). The biomass 

 here is very small — inferior only to that of the Atlantic trench {Table 64). 



The nine biocoenoses examined are, of course, not all the biocoenotic 

 variety of the open parts of the Barents Sea, especially as regards its epifauna. 



Distribution and composition of bottom communities of certain inlets andgubas. 

 A quantitative investigation of the benthos of the Motovsky (R. Leibson, 1939) 



Table 64 



