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Fishery Bulletin 105(2) 



more likely contained gadids (mostly pollock) than any 

 other species. 



There was a positive relationship between scat size 

 (volume) and the numbers of prey types each scat con- 

 tained for samples <250 mL (which represented about 

 50% of the scats collected). Beyond this volume, numbers 

 of prey types per scat appeared to be independent of scat 

 size (Fig. 7). 



In terms of which prey groups occurred most frequent- 

 ly together, the highest partial correlation among prey 

 groups was between salmon and forage fish (rooker- 

 ies: r=0.23, '•oo,5r2),744 = 00'7, P<0.05; haulouts: r=0.189, 

 '"oo.5(2i67K= 0.08, P<0.05; Fig. 8 1. Gadids and cephalopods 

 were also significantly correlated in scats from both 

 rookeries (r=0.11) and haulouts (r=0.08), whereas gadids 

 were negatively correlated with occurrences of salmon 



