THE SEA OF AZOV 



481 



Fig. 226a. Distribution of biomass (g/m 3 ) of Monodacna and Syn- 

 desmya in the Gulf of Taganrog (Mordukhai-Boltovskoy). 



The marked interchange of relict and marine faunas in the Gulf of Taganrog 

 affects not only the qualitative composition but also the quantitative ratio 

 of these two components. In the eastern part of the Gulf there is a huge pre- 

 dominance of relict species in the biomass, while in the western part the 

 marine forms are predominant (Fig. 227). 



Thus not only do these two faunas not mix, but they are divided from each 

 other by a distinctive intermediate area. This fact, it corresponds to reality, is 

 of great theoretical interest, as we have said earlier. 



Plankton 



Qualitative composition of phytoplankton. As usually happens, the biomass of 

 the vegetable part of the plankton of the Sea of Azov is considerably larger 



Fig. 226b. Distribution of Cardium and Dreissena biomass 

 (g/m 3 ) in the Gulf Taganrog (Mordukhai-Boltovskoy). 



2h 



