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• W3088471107 abstract "Mass regulation is birds is well documented. For example, birds can increase body mass in response to lower availability and/or predictability of food and decrease body mass in response to increased predation danger. Birds also demonstrate an ability to maintain body mass across a range of food qualities. Although the adaptive significance of mass regulation has received a great deal of theoretical and empirical attention, the mechanisms by which birds achieve this have not. Several non-exclusive mechanisms could facilitate mass regulation in birds. Birds could regulate body mass by adjusting food intake (dieting), activity, baseline energetic requirements (basal metabolic rate, or BMR), mitochondrial efficiency, or assimilation efficiency. Here, we present the results of two experiments in captive red knots (Calidris canutus islandica) that assess three of these proposed mechanisms: dieting, activity, and up/down-regulation of metabolic rate. In the first experiment, knots were exposed to cues of predation risk that led them to exhibit presumably adaptive mass loss. In the second experiment, knots maintained constant body mass despite being fed on alternating high- and low-quality diets. In both experiments, regulation of body mass was achieved through a combination of changes in food intake and activity. Both experiments also provide some evidence for a role of metabolic adjustments. Taken together, these two experiments demonstrate that fine-scale management of body mass in knots is achieved through multiple mechanisms acting simultaneously." @default.
• W3088471107 created "2020-10-01" @default.
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• W3088471107 date "2020-01-01" @default.
• W3088471107 modified "2023-10-07" @default.
• W3088471107 title "Red knots (Calidris canutus islandica) manage body mass with dieting and activity" @default.
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• W3088471107 doi "https://doi.org/10.1242/jeb.231993" @default.
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• W3088471107 hasPublicationYear "2020" @default.
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