The power of feeder-mask respirometry as a method for examining hummingbird energetics

Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
K C Welch

Abstract

Many birds spend important portions of their time and energy flying. For this reason, quantification of metabolic rates during flight is of crucial importance to understanding avian energy balance. Measurement of organismal gas exchange rates using a mask enclosing the whole head or respiratory orifices has served as an important tool for studying animal energetics because it can free the rest of the body, permitting movement. Application of so-called "mask respirometry" to the study of avian forward flight energetics presents unique challenges because birds must be tethered to gas analysis equipment thus typically necessitating use of a wind tunnel. Resulting potential alterations to a study organism's behaviour, physiology, and aerodynamics have made interpretation of such studies contentious. In contrast, the study of hovering flight energetics in hummingbirds using a specialized form of mask respirometry is comparatively easy and can be done without a wind tunnel. Small size, hovering flight, and a nectarivorous diet are characteristics shared by all hummingbird species that make these birds ideally suited for this approach. Specifically, nectar feeders are modified to function as respirometry masks hummingbirds voluntarily...Continue Reading

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Mar 29, 2014·Proceedings. Biological Sciences·Victor M Ortega-JimenezRobert Dudley
Jul 6, 2014·Journal of the Royal Society, Interface·Erica J KimRobert Dudley
Nov 30, 2011·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Donald R PowersDouglas R Warrick
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Sep 28, 2012·The Journal of Experimental Biology·Nir Sapir, Robert Dudley

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