Composition and Distribution of Macrobenthic Invertebrate Fauna 



149 



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CRUSTACEA 



Figure 146 



Geographic distribution of Crustacea: A — number of specimens per square meter 

 of bottom; B — biomass in grams per square meter of bottom. 



commonly inhabited areas. They were absent from al- 

 most all of the continental slope and from much of the 

 central Gulf of Maine. Densities of from 1 to 49 indi- 

 viduals/m and biomasses of less than 10 g/m 2 were 

 most prevalent, but large quantities (100-5,000 indi- 

 viduals and 50-612 g/m 2 ) were not unusual in the 

 coastal and nearshore localities. 



Barnacles were present in four of the six standard 

 geographic areas; they were absent from Georges Slope 



and the Southern New England Slope (Table 6; 

 Fig. 149). The two areas where they were especially 

 abundant were the Southern New England Shelf (52/ 

 m 2 ) and Nova Scotia (36/m ). Densities in the Gulf of 

 Maine and on Georges Bank were only 3 and 6/m 2 , 

 respectively. 



Biomass in Nova Scotia was larger (13 g/m ) than on 

 the Southern New England Shelf (7 g/m 2 ) even though 

 densities were higher in the latter area (Table 8; Fig. 



