Effect of Ambient Air Temperature on Food Intake of Captive Sub-adult Great Cormorants <i>Phalacrocorax carbo hanedae</i>

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  • 外気温が人工飼育されたカワウ亜成鳥の摂餌量に及ぼす影響
  • Effect of Ambient Air Temperature on Food Intake of Captive Sub-adult Great Cormorants Phalacrocorax carbo hanedae

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Daily food intake and changes in body mass of five, hand-reared sub-adult Great Cormorants Phalacrocorax carbo hanedae were measured in an outdoor cage over 117 days during winter and spring. During the period of the study, the five birds maintained almost constant body masses, despite variation in their daily food intake (they were fed ad lib). Daily food intake mass per unit body mass of individuals decreased significantly as the ambient air temperature increased, but daily body mass increment per unit body mass of individuals did not. These results indicate that the daily energy expenditure of cormorants decreases as ambient air temperature increases, probably because of the suppression of thermoregulation costs.

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