Composition and Distribution of Macrobenthic Invertebrate Fauna 63 



NUMBER PERCENT WEIGHT 



MEAN PERCENTAGE ORGANIC PERCENTAGE MEAN 



ALL TAX A COMPOSITION CARBON COMPOSITION ALL TAXA 



221 



1,838 



741 



1,015 



914 



2,042 



2,588 



44 



o.oo 



0.01 to 0.49 



O.SO to 0.99 



1.00 to 1.49 



l.SO to 1.99 



2.00 to 2.99 



3.00 to 4.99 



5.00 to ♦ 



EXPLANATION 



17 



218 



96 



97 



89 



959 



809 



< 1 



CBU5TACEA \\'>S', MOLLUSC A 



ECHINODERMATA 



□ 



Figure 26 



Quantitative composition of the total macrobenthic invertebrate fauna in 

 relation to organic carbon in the sediments. Mean number of individuals 

 and mean wet weight, per square meter of bottom, and percentage compo- 

 sition, bv density and biomass, for the major taxonomic groups are shown. 



tal rise (Table 13; Fig. 29). In the various depth classes 

 average biomass ranged from 0.02 to 3.1 g/m . In deeper 

 water the average weights were only 0.02 to 0.6 g/m". 



In all depths Porifera accounted for a small percent- 

 age (<1%) of the total number of benthic animals 

 (Table 12). The percentage of the total weight of the 



