Macrozoarces americanus 



WINTER 1977 



SPRING 1977 



I00-, 

 90- 

 80 

 70- 

 60 



UJ 



m 40- 



z 30 

 S* 

 20- 



10- 







10- 



20- 

 30 



UJ 



2 40- 

 § 50i 

 6 s - 60- 



70 



88% 



IRI 



8546 



1728 



2263 







74 



I I 



36% 



=£-— 



36% 8% 



44% 



% FREQUENCY 



100 

 90 



80- 



70- 



60- 



50 



£ 40- 



m 



| 30- 



5 so- 

 io- 

 o- 



10- 



ui 20" 

 s 



3 30-* 

 o 



^ 40" 

 50 

 60 



100% 



SUMMER 1977 



84% 



IRI 



A 



AMPHIP0DA 



1 1811 



B 



DECAPODA 



2617 



C 



POLYCHAETA 



472 



D 



PELECYPOOA 



5 



E 



CUMACEA 



12 



F 



ECHINOIDEA 



1 76 



54°/c 



i ; 



Hrr 



4% 



21% 



17% 



42% 



IRI 



A 



9656 



B 



3347 



C 



41 



D 



37 



E 



6 



F 



1 



w 



c De 



6% 



, 4% 

 14% 



47% 



% FREQUENCY 



Figure 17. — Percent frequency occurrence, percent number, percent volume 

 displacement, and index of relative importance (IRI) of higher taxonomic 

 groups of food in the diet of Macrozoarces americanus, by seasonal cruise. 



21 



