Composition and Distribution of Macrobenthic Invertebrate Fauna 



163 



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EXPLANATION 



□ 1-9 

 10-49 

 50-520 



INDIVIDUALS 

 PER SQUARE METER 



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ISOPODA 



Figure 166 



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

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



viduals/m extended over large areas of the Gulf of Maine 

 and Southern New England. High densities of 50 to 520 

 individuals/m 2 occurred in reladvely few small areas. Av- 

 erage biomass was commonly less than 1 g/m , and the 

 highest average biomasses were between 1 and 9.9 g/m 2 . 

 Among the six standard geographic areas, isopods 

 were most numerous (18 and 17 individuals/m 2 ) on 

 Georges Bank and the Southern New England Shelf 



(Table 6; Fig. 167). Intermediate densities (3.9 and 

 9.5/m 2 ) were found in the Nova Scotia and Gulf of 

 Maine areas. Low densities (1.0 and 1.3/m 2 ) occurred 

 in the two slope areas. 



The average biomass of isopods was small (0.4 g/m 2 

 or less) in all areas (Table 8; Fig. 167). 



The quantitative geographic distribution of isopods 

 was very similar to that of cumaceans (see Table 6). The 



