FOOD 



ITEMS 



ANIMALS 

 Annelid 

 Nereis sp. 

 Other 

 Moll u sk 

 Pelecypod 

 M ytilus edulis 

 Gemma g emma 

 Myi arenaria 

 Other 

 Gastropod 

 H ydroiiia minuta 

 Other 

 Arthropod 

 Crab 



Small arthropod 

 Barnacle 

 Insect 



Foraminifera 

 Fish 

 Other 

 PLANTS 

 Algae 

 Sp art ina sp, 



UNIDENTIFIED 



STOMACHS with food 

 STOMACHS nearly empty 



10 



PERCENT 

 30 50 



I I I i_ 



70 



90 



I 



SUBTIDAL CRABS 

 INTERTIDAL CRABS 



FOOD 



ITEMS 



AVERAGE 



NUMBER 



I NTE RTI DAL 



SUBTIDAL 



Annelid 



Nereis sp. 



Other 

 Mollusk 



Pelecypod 

 My tilus edulis 

 Gemma g emma 

 Myj arenaria 

 Other 



Gastropod 

 H ydrooia minuta 

 Other 



0.11 

 .11 



<.l 



2.5 



2.0 

 .4 

 .4 



1.0 

 .1 

 .6 

 .3 



<.l 



0.05 

 .05 

 <.01 

 1 7.5 

 10.2 

 2.3 

 6.7 

 .9 

 .2 

 7.3 

 6.7 

 <.l 



TOTAL NO. of CRABS 



847 



1.300 



Figure 4. — Tlie average numbers of certain animals per stomacli and the jiercentagre frequency of occur- 

 rence of food items in green crabs caught from the intertidal (shaded bars) and subtidal (black 

 bars) zones during 1!).>1 and 1955. 



190 



U.S. FISH AND WILDLIFE SERVICE 



