Abstract
1. 1. Mean assimilation efficiencies ( AE) of five White-ehinned petrel fledglings fed on light-fish, squid, and Antarctic krill were 77.9, 74.4 and 76.0%, respectively. 2. 2. After correction for nitrogen retention, AE n values decreased to 69.1% for light-fish, 68.0% for squid, and 67.5% for Antarctic krill. Differences in AE for different prey types may result from differential nitrogen content of the prey tissue. 3. 3. Assimilation efficiency values for fish and squid of a specialized feeder, the Jackass penguin, differ more than the AEs of White-chinned petrels for these food types. The generalized diet of the White-chinned petrel may account for this species' ability to assimilate widely different prey types with similar efficiencies.
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