1 84 NOAA Technical Report NMFS 1 40 



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INDIVIDUALS 

 PER SQUARE METER 



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GRAMS 

 PER SQUARE METER 



BRACHIOPODA 



Figure 196 

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

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



decreased to 5% in deeper water classes and to 10 to 

 2% in the shallower water depth classes (Table 15). 



Relation to Sediments 



Brachiopods occurred in all sediment types found in 



the region but showed a pronounced preference for 



icoarsei types over the finer ones (Tables 16 ? 18; Fig. 



199). Till sediments ranked first in preference, contain- 

 ing an average of 48 individuals/irr and an average 

 biomass of nearly 16 g/m 2 . 



Interestingly, although shell sediments ranked sec- 

 ond in terms of density (37/m 2 ), they ranked last (0.22 

 g/m'-') in terms of biomass. Gravel, with a mean density 

 and biomass of 14/m 2 and 2.44 g/m 2 , respectively. 



