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• W2610137946 endingPage "R131" @default.
• W2610137946 startingPage "R120" @default.
• W2610137946 abstract "Using red knots ( Calidris canutus) as a model, we determined how changes in mass and metabolic activity of organs relate to temperature-induced variation in metabolic performance. In cold-acclimated birds, we expected large muscles and heart as well as improved oxidative capacity and lipid transport, and we predicted that this would explain variation in maximal thermogenic capacity (M sum ). We also expected larger digestive and excretory organs in these same birds and predicted that this would explain most of the variation in basal metabolic rate (BMR). Knots kept at 5°C were 20% heavier and maintained 1.5 times more body fat than individuals kept in thermoneutral conditions (25°C). The birds in the cold also had a BMR up to 32% higher and a M sum 16% higher than birds at 25°C. Organs were larger in the cold, with muscles and heart being 9–20% heavier and digestive and excretory organs being 21–36% larger than at thermoneutrality. Rather than the predicted digestive and excretory organs, the cold-induced increase in BMR correlated with changes in mass of the heart, pectoralis, and carcass. M sum varied positively with the mass of the pectoralis, supracoracoideus, and heart, highlighting the importance of muscles and cardiac function in cold endurance. Cold-acclimated knots also expressed upregulated capacity for lipid transport across mitochondrial membranes [carnitine palmitoyl transferase (CPT)] in their pectoralis and leg muscles, higher lipid catabolism capacity in their pectoralis muscles [β-hydroxyacyl CoA-dehydrogenase (HOAD)], and elevated oxidative capacity in their liver and kidney (citrate synthase). These adjustments may have contributed to BMR through changes in metabolic intensity. Positive relationships among M sum , CPT, and HOAD in the heart also suggest indirect constraints on thermogenic capacity through limited cardiac capacity." @default.
• W2610137946 created "2017-05-05" @default.
• W2610137946 creator A5001331441 @default.
• W2610137946 creator A5011768453 @default.
• W2610137946 creator A5033978446 @default.
• W2610137946 creator A5058156211 @default.
• W2610137946 date "2017-08-01" @default.
• W2610137946 modified "2023-10-14" @default.
• W2610137946 title "The performing animal: causes and consequences of body remodeling and metabolic adjustments in red knots facing contrasting thermal environments" @default.
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• W2610137946 doi "https://doi.org/10.1152/ajpregu.00453.2016" @default.
• W2610137946 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/28438763" @default.
• W2610137946 hasPublicationYear "2017" @default.
• W2610137946 type Work @default.
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