190 



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



JUNE JULY AUG SEPT OCT 



, 11 U 105 , , 105 



Fig. 83. Oxygen content of Kandalaksha Bay water. A Annual course 



of oxygen content (percentage of saturation) in the open Sea off Umba ; 



В Cross section from Umba to Keret (Sokolova, 1939). 



of freezing ; but we cannot yet rule out the equal possibility of the onset of 

 the summer-autumn stagnation in the bottom layer itself. On the other hand 



Table 80 



100 150 200 250 



101-5 1000 950 88-1 



the presence of red clay in the White Sea makes it possible to presume an accu- 

 mulation of carbon dioxide in the bottom layer,- which obstructs an abundant 

 development of bottom life in the deep part of the Sea. 



A. Trofimov and Ya. Golubchik (1947) have produced some mean indices 

 {Table 81) of chemical conditions in the central part of the White Sea in 

 springtime. 



Table 81 



