HOBSON and CHESS: TROPHIC INTERACTIONS 



canopy, 5 from the lower portions of the plants), 7 

 were empty and 3, whose stomachs averaged 13% 

 full, contained crustacean fragments (55% of total 

 volume) and unidentified material. NIGHT- 

 TIME-20 individuals (7-12 mm, x = 10.5) taken at 



middepth 2 h before first morning light had 

 stomachs averaging 82% full, and containing 

 crustacean fragments (100% of total volume), 

 including copepods and cladocerans. Clearly, S. 

 pacifica is a nocturnal predator. 



575 



