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Assimilation Efficiency of Adult Kittiwakes and Brünnich's Guillemots Fed Capelin and Arctic Cod

08 Nov 1993

The mean assimilation efficiencies of 10 adult Kittiwakes (Rissa tridactyla) and 10 Brünnich's Guillemots (Uria lomvia) fed on Capelin (Mallotus villosus) were 77.5% and 74.4%, respectively. When fed on Arctic Cod (Boreogadus saida) they were 83.1% and 78.2%, respectively. After correction for nitrogen retention, the assimilation efficiencies decreased to 72.2%, 70.6%, 81.2% and 74.7%, respectively. Kittiwakes and Brünnich's Guillemots seem to have the same ability to utilize the energy of the different food items. The differences in assimilation efficiencies when fed two fish species was mainly related to the fat content of the fish.

Status: Completed

Type: Staff Publications

Author: Bente Brekke, Geir Wing Gabrielsen

Year of publication: 1993

Publisher: Polar Biology

Tags: Arctic cod

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