THE BERING SEA 



827 



characteristic of the Bering Sea, in contrast to the Seas of Okhotsk and 

 Japan. Their amounts are not reduced to a minimum by the development 

 of phytoplankton. However, a sharp decrease of nutrient salts is at times 

 observed in the surface waters {Table 325). The curves of phosphate 



3346 3348 3349 



Stations 



3350 3351 3352 A 1 * 3353 



33S4 3355 3356 



i г 



SO miles 



Fig. 418. Distribution of temperature (a) and salinity (b) on the cross section Cape 

 Africa to Attu Island (Burkov, 1958). 



distribution show a dome-like rise in the central part of the Sea ; this is the 

 result of the cyclonic movement of waters in the Bering Sea. 



II. FLORA AND FAUNA 

 A biogeographical division into cold western and warm eastern zones 

 characterizes the surface horizons throughout the Bering Sea. This division 

 is particularly pronounced in the northern part of the Sea (Fig. 419). 



