THE BALTIC SEA 

 Table 128 



321 



small scale in the Bay of Danzig. At a depth of less than 100 m Macoma 

 baltica biocoenosis is preponderant ; deeper down it gives way to Scoloplos 

 armiger, Mesidothea entomon and Pontoporeia femorata. 



Demel distinguishes two main groups of bottom biocoenoses : the deeper 

 and colder-water biocoenosis consisting exclusively of stenothermic cold- 

 water species, and the biocoenoses of shallower and warmer coastal waters 



Fig. 156. Zoobenthos total biomass in southern Baltic Sea without Mytilus edulis 

 (Demel and Mulicki, 1954). 



