114 



D. G. AINLEY AND G. A. SANGER 



Table 15. Use of food resources by seabirds in the North American coastal domain. Information 

 is from Tables 1-10. (Trophic level I = plants, II = secondary carnivore, III = tertiary carni- 

 vore, IV = upper level carnivore, Sc = scavenger on carrion, offal, or detritus [II-IV]; x = 

 major food in diet, o = minor food, = incidental food, ? = probable food.) 



Habitat, bird trophic levels (I-IV, Sc), and food categories 



Oceanic and offshore 

 neritic 



Inshore neritic 



III IV Sc I 



IT 



III IV Sc 



