Abstract
Abstract The feeding ecology of juvenile and subadult Guadalupe fur seals ( Arctocephalus townsendi ) at San Benito Archipelago, Baja California, Mexico, was investigated to determine if dietary differ-ences exist between these two age classes. During the summer of 2007, 108 scats of fur seals were collected from areas used mainly by juveniles ( n = 54 scats) or subadults ( n = 54 scats). Cephalopod beaks and/or otoliths were found in all samples collected. Only 702 squid beaks of 1,144 were identified to species level (61.3%). Only four of eight otoliths found were identified to species level (50%). Six squid species and two fish spe-cies were identified. Both juveniles and subadults showed similar dietary composition; however, differences between prey selection were found. The California market squid ( Loligo opalescens ) was the most common squid species for both age classes in the summer of 2007. Key Words: Guadalupe fur seal, Arctocephalus townsendi , San Benito Archipelago, California market squid,
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