Composition and Distribution of Macrobenthic Invertebrate Fauna 



153 



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I — I NUMBER 

 ■ WEIGHT 



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1 



SAND- SILT- 



SILT CLAY 



BOTTOM SEDIMENTS 



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Figure 151 

 Density and biomass of Cirripedia in relation to bottom sediments. 



highest with an incidence rate of 13 to 17%. The 

 rate was moderately high in till, but in all other types 

 they were present in less than 3% of the samples 

 (Table 20). 



Relation to Water Temperature 



Barnacles occurred throughout the entire temperature 

 range spectrum of the New England region (Table 21; 

 Fig. 152). There was a pronounced increase in density as 



