Energetics of calling and metabolic substrate use during prolonged exercise in the European treefrog Hyla arborea
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Rates of oxygen consumption and carbon dioxide release were measured in calling and resting European tree frogs using open-flow-through respirometry. The energetic cost of calling was high with an average of 1.076 ml O2/(g · h) at average call rates of 8000 calls/h. The maximum factorial metabolic scopes averaged 24 with momentary peak values ranging between 5 and 41. There was a threefold difference in O2-consumption between individual males calling at the same rate. Respiratory quotients indicated that both lipids and carbohydrates were used to fuel calling. Carbohydrates provided the major fuel (69% on average) with dependence on carbohydrates increasing with call rate. In contrast to marathon runners, there was no shift in metabolic substrate use over a calling period of 2–3 h.
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