266 



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

 Table 116 



Characteristic 



Biomass of zoo- and phyto-plankton in central 



areas of Chukotsk Sea, mg/m 3 



(Bogorov's data) 



Upper water layer down to 10 m 



Eastern 

 part of Sea 



to Cape 

 Angueme 



Cape 



Angueme 



area among 



heavy ice 



Western 

 part of Sea 



Through- 

 out water 

 column 



Whole Sea 



Zooplankton 



biomass in 



open parts of 



Chukotsk Sea 



(Jashnov's 



data) 



Throughout 

 water column 



Northwestern 

 part of Sea 



Zooplankton 

 Range 



Phytoplankton 

 Total biomass 



232-2 

 38 762 



1,510-0 



1,742-2 



1000 

 10 304 



379-1 

 4791 



139-5 

 71 208 



2,7600 

 2,899-5 



1600 

 56 465 



640 



The greatest 



177 



found in the Chukotsk Sea. The following numbers of animal species and 

 variants found in the Chukotsk Sea {Table 117) have so far been published. 



As yet this list is very incomplete. Many groups have not yet been examined 

 (Turbellaria, Nemertini, Nematoda) and others not sufficiently analysed. 

 However, the considerably greater poverty of the Chukotsk Sea fauna com- 

 pared with that of the varied fauna of the Barents Sea is revealed by a com- 

 parison of the wealth of species of its groups already studied in detail. 



P. Ushakov (1952) supposes that the shallow depths, the preponderance of 

 hard bottoms, the lowered salinity and the severe temperature conditions of 

 the Chukotsk Sea should be considered the causes of this poverty. 



Distribution. The littoral zone of the Chukotsk Sea is not populated. Only at a 

 depth of 5 to 8 m do macrophytes live {Entermorpha crinita, Dichyosiphon 



Table 117 



