238 



Fishery Bulletin 105(2) 



Statistical analyses were performed on the sim- 

 ple frequency of occurrences to determine whether 

 diets varied by sites and time (across years). We 

 used a contingency table analysis for the total num- 

 ber of scats containing particular prey categories 



(Pearson x". o<0.05). The cephalopod and hexagram- 

 mid prey categories were not considered in these anal- 

 yses because of their low frequencies of occurrence. 

 Differences in the number of categories of prey con- 

 sumed on each foraging trip (i.e., the number of prey 



