Mechanistic Drivers of Flexibility in Summit Metabolic Rates of Small Birds

  title={Mechanistic Drivers of Flexibility in Summit Metabolic Rates of Small Birds},
  author={David L Swanson and Yufeng Zhang and Marisa O. King},
  booktitle={PloS one},
Flexible metabolic phenotypes allow animals to adjust physiology to better fit ecological or environmental demands, thereby influencing fitness. Summit metabolic rate (Msum = maximal thermogenic capacity) is one such flexible trait. Skeletal muscle and heart masses and myocyte metabolic intensity are potential drivers of Msum flexibility in birds. We examined correlations of skeletal muscle and heart masses and pectoralis muscle citrate synthase (CS) activity (an indicator of cellular metabolic… CONTINUE READING
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