Journal of Comparative Physiology B

, Volume 171, Issue 1, pp 69–76 | Cite as

Energetics of calling and metabolic substrate use during prolonged exercise in the European treefrog Hyla arborea

  • T. U. Grafe
  • J. Thein
ORIGINAL PAPER

Abstract

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.

Key words Respiratory quotient Energetics Metabolic substrates Hylidae Anurans 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2001

Authors and Affiliations

  • T. U. Grafe
    • 1
  • J. Thein
    • 2
  1. 1.Zoologie 3, Biozentrum, Am Hubland, 97074 Würzburg, Germany e-mail: grafe@biozentrum.uni-wuerzburg.de Tel.: +49-931-8884372; Fax: +49-931-8884352DE
  2. 2.Department of Animal Ecology and Tropical Biology, Biozentrum, University of Würzburg, 97074 Würzburg, GermanyDE

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