These genera also dominated in 1984, accounting for 

 84.9% of the total number. However, the relative number of the 

 genera Bacillus and Bacterium was somewhat less, while the 

 numbers of the genera Planococcus and especially 

 Pseudomonas increased. Generally, pigmented forms 

 dominated (93.3%) of all isolates. 



For the Chukchi Sea, isolates fell between bacterial 

 populations of the Bering and Baltic Seas (Table 5). Here, 

 isolates from the Chukchi Sea occurred over 1 1 genera: 

 Pseudomonas. Xantomonas. Alcaligenes. Klebsiella. 

 Aeromonas, and others (Fig.l). Taxonomic diversity of the 

 dominating genera in the Chukchi Sea was somewhat less than 

 in the Bering Sea ( 1 3 genera) but greater than in the Baltic Sea 

 (9 genera). 



TABLE 5 



Some morphological traits of Lsolates of heterotrophic bacteria 



from the Bering. Chukchi and Baltic Seas in % of the total number 



of the investigated strains. 



Morphologic traits Bering Sea Chukchi Sea Baltic Sea 



Cocci 



Gram-positive 



Gram-neaative 



18.6 

 70.8 

 29.2 



L\0 

 29.9 

 70.1 



4.5 

 39.5 

 60.5 



Thus, this comparative analysis suggests that a distinction 

 occurs between the morphological, physiological, and 

 taxonomic characteristics of bacterial isolates from the Chukchi 

 Sea realtive to the Baltic (an impact region) and Bering (a 

 background region) Seas. Only the index of relation between 

 pigmented and nonpigmented forms does not comply with this 

 assessment. Based on this analysis ( i.e., the number of bacillary 

 and Gram-negative bacteria, taxonomic diversity, and number 

 of Pseudomomis sp. ) the Chukchi Sea is specified as a region 

 with a higher level of anthropogenic pollution. 



Pseudomonas 

 Xantomonas 

 Alcaligenes 

 Halobactenum 

 Aefomonas 

 Flavobactenum' 

 Staphylococcus 

 Micrococcus 

 Planococcus 

 Aerococcus 

 Bacillus 

 Ailhrobacter 



Another 



Benng Sea 



Fig. I. Taxonomic positin of the strains of heterotrophic microorganisms of 

 the Chukchi. Bering, and Baltic Seas. 



90 



