196 



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

 Table 83 



Diatomaceae 



Cyanophyceae 



Chlorophyceae 



Schizophyceae 



Phaeophyceae 



Rhodophyceae 



Total 



212 species 



3 species 



41 species 



2 species 



80 species 



67 species 



405 species 



Z. nana. Of the macrophytes the greatest mass forms are : Laminaha sacchar- 

 ina, L. digitata, Fucus vesiculosus, F. serratus, Ascophyllum nodosum, Alaria 

 esculenta, Desmarestia aculeus, D. viridis, Chorda filum, Ch. tomentosa, 

 Pilayella, Ectocarpus, Rhodymenia pa/mata, Ahnfeltia plicata. It is interesting 

 to note that the mass destruction of Zostera that has taken place in the nor- 

 thern Atlantic has occurred in the White Sea only in 1960-61. 



The supply of algae in the White Sea exceeds that on the Murman Peninsula. 

 The supply of Laminaria is as much as 800,000 tons wet weight ; of Fucus, 

 250,000 tons, and of Zostera, which is absent from the Murman Peninsula, 

 400,000 tons. The total supply of algae in the White Sea — macrophytes and 

 Zostera — is as much as 1-5 million tons wet weight. 



Zoobenthos. The White Sea zoobenthos, from data that are not yet complete, 

 comprises, according to Derjugin, more than 1,000 species {Table 84) : 



Table 84 



Clearly even these 1,007 species are not a complete list of the components 

 of the fauna. Further study of the fauna of the White Sea will add several 

 hundreds of species. 



Zoogeographical characteristics. As has been said above, the fauna of the 

 White Sea is not homogeneous from the zoogeographical standpoint. On the 



