134 



NOAA Technical Report NMFS 140 



5 



u.a iz 



o * 

 2 in 



o o NUMBER 



• • WEIGHT 



5 

 O 



i CD 



x s 



o 

 — uj 



UJ cc 



s < 



uj CO 



25 50 100 200 500 1000 2000 4000 



WATER DEPTH IN METERS 



Figure 125 



Density and biomass of Scaphopoda in relation to water depth. 



greatest in the 4°-7.9°C range class and diminished 

 steadily as temperature range broadened (Tables 21, 

 23; Fig. 127). None were found in the 20°-23.9°C class. 

 Quantitative values for density ranged from 0.2 to 10.3 

 individuals/m 2 and for biomass from <0.01 to 0.92 g/m 2 . 

 In terms of both density and biomass they provided gener- 

 ally less than 2% of the total fauna (Tables 22, 24). 



Scaphopods occurred in 2 to 37% of the samples in 

 the temperature range classes in which they were found 



(Table 25). Frequency of occurrence was highest where 

 the temperature range was small, and the frequency 

 rate decreased as the temperature range expanded. 



Relation to Sediment Organic Carbon 



Scaphopods occurred where organic carbon content 

 ranged from to 2.99%. They were most abundant ( 12 

 to 13 individuals/m-) in the two moderate carbon con- 

 tent classes 1.50-1.99 and 1.00-1.49%, respectively, and 



