QUICK SEARCH:   [advanced] Author: Keyword(s):
Home     Help     Feedback     Subscriptions     Archive     Search     Table of Contents

This Article Full Text (PDF) References Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Walsberg, G. Articles by Wolf, B. Search for Related Content PubMed PubMed Citation Articles by Walsberg, G. Articles by Wolf, B. Social Bookmarking                         What's this?

Journal of Experimental Biology, Vol 198, Issue 1 213-219, Copyright © 1995 by Company of Biologists

JOURNAL ARTICLES

Variation in the respiratory quotient of birds and implications for indirect calorimetry using measurements of carbon dioxide production

G Walsberg and B Wolf

Determination of animal power consumption by indirect calorimetry relies upon accurate estimation of the thermal equivalent of oxygen consumed or carbon dioxide produced. This estimate is typically based upon measurement or assumption of the respiratory quotient (RQ), the ratio of CO2 produced to O2 consumed. This ratio is used to indicate the mixture of lipids, carbohydrates and proteins in the metabolic substrate. In this analysis, we report the RQ for two bird species, Passer domesticus and Auriparus flaviceps, under several dietary and fasting regimes. RQ commonly differed substantially from those typically assumed in studies of energy metabolism and often included values below those explainable by current knowledge. Errors that could result from these unexpected RQ values can be large and could present the primary limit to the accuracy of power consumption estimates based upon measurement of carbon dioxide production.
CiteULike    Complore    Connotea    Del.icio.us    Digg    Reddit    Technorati    Twitter    What's this?

This article has been cited by other articles:

				W. A. Van Voorhies, A. A. Khazaeli, and J. W. Curtsinger Testing the "rate of living" model: further evidence that longevity and metabolic rate are not inversely correlated in Drosophila melanogaster J Appl Physiol, November 1, 2004; 97(5): 1915 - 1922. [Abstract] [Full Text] [PDF]

				W. A. Van Voorhies, A. A. Khazaeli, and J. W. Curtsinger Selected Contribution: Long-lived Drosophila melanogaster lines exhibit normal metabolic rates J Appl Physiol, December 1, 2003; 95(6): 2605 - 2613. [Abstract] [Full Text]

				K. M. Wooden and G. E. Walsberg Effect of environmental temperature on body temperature and metabolic heat production in a heterothermic rodent, Spermophilus tereticaudus J. Exp. Biol., July 15, 2002; 205(14): 2099 - 2105. [Abstract] [Full Text] [PDF]

				P. Hawkins, P. Butler, A. Woakes, and J. Speakman Estimation of the rate of oxygen consumption of the common eider duck (Somateria mollissima), with some measurements of heart rate during voluntary dives J. Exp. Biol., January 9, 2000; 203(18): 2819 - 2832. [Abstract] [PDF]

				K. Wooden and G. Walsberg Effect of wind and solar radiation on metabolic heat production in a small desert rodent, Spermophilus tereticaudus J. Exp. Biol., January 3, 2000; 203(5): 879 - 888. [Abstract] [PDF]

				R. Tracy and G. Walsberg Prevalence of cutaneous evaporation in Merriam's kangaroo rat and its adaptive variation at the subspecific level J. Exp. Biol., January 2, 2000; 203(4): 773 - 781. [Abstract] [PDF]

				B. Wolf, K. Wooden, and G. Walsberg Effects of complex radiative and convective environments on the thermal biology of the white-crowned sparrow (Zonotrichia leucophrys gambelii) J. Exp. Biol., January 2, 2000; 203(4): 803 - 811. [Abstract] [PDF]

				D. O'Brien Fuel use in flight and its dependence on nectar feeding in the hawkmoth Amphion floridensis J. Exp. Biol., January 2, 1999; 202(4): 441 - 451. [Abstract] [PDF]