Composition and Distribution of Macrobenthic Invertebrate Fauna 133 



NEW \ NEW S\ \ 



JERSEY '.YORK/ \ \ N EW / 



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:onnecticut\ \ ;' »or'lano» 



SCAPHOPODA 



Figure 123 



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

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



126). Relatively large biomasses were found in shell, till, 

 and silt-clay sediments and small biomasses occurred in 

 sand, sand-silt, and gravel. Scaphopods made up only a 

 small portion (1.2% or less) of the total biomass in all 

 bottom types (Table 19). 



Frequency of occurrence of scaphopods was espe- 

 cially low (10 to 17%) in sand and gravel (Table 20). In 



shell, till, and other finer sediments they occurred in a 

 moderate (30 to 46%) proportion of the samples. 



Relation to Water Temperature 



Scaphopods were most often found in the more stable 

 environments where the temperature variations were 

 small. Density and biomass of these organisms were 



