GENERAL CHARACTERISTICS OF FAR EASTERN SEAS 



747 



lower-temperate boreal (central parts of the Sea of Japan and the small Kuril 

 Ridge) ; and south boreal (southern and southeastern parts of the Sea of Japan). 

 Apart from the larger biogeographical subdivisions of the northwestern 

 part of the Pacific, some further subdivisions are possible for each basin. 

 Thus K. Brodsky (1954) divides the Bering Sea into six main regions accord- 

 ing to the zooplankton — the oceanic, the Bering Sea, the north Bering Sea, 

 western neritic, eastern neritic and deep water regions. Brodsky characterizes 

 each of them by their physicogeographical peculiarities and by the list of their 



Fig. 367. Zoogeographical division of the Bering Sea 

 (Andriashev). 1 Chukotsk (temperate- Arctic) province ; 

 2a North Bering (sub- Arctic) region, Anadyr area; 

 2b Same, Norton area; 3a Province of Eastern 

 Kamchatka (boreal), Avachinsk area; 3b Same, 

 Komandor area ; 3c Same, Koryatzk area ; 4 Aleutian 

 (temperate-boreal) province. 



forms of zooplankton. Andriashev has distinguished within the Bering Sea 

 temperate boreal province six smaller biogeographical subdivisions. 



In a similar manner Savilov divides the Sea of Okhotsk, according to the 

 environment of the habitat and the predominant species, into six ecological 

 zones, each of which in turn might be divided further into more detailed bio- 

 coenoses. Six main regions of macrobiocoenoses are distinguishable for the 

 Barents Sea according to its bottom-living fauna. Such microregions could 

 be equally considered as biogeographical and ecological biocoenotic sub- 

 divisions. One merges into another. 



Amphi-Pacific habitats in the northern part of the Ocean are as character- 

 istic of the distribution of its population as the amphi- Atlantic ; Shchapova 

 gives the littoral sea-weeds of the genera Eisenia and Pelvetia as examples of 

 this kind of zonation. Of the five species of Eisenia one (E. bicyclis) is 

 distributed along the shores of Japan ; three (E. arborea, E. masonii and E. 



