RT Journal Article
SR Electronic
T1 Cardiorespiratory adjustments of homing pigeons to steady wind tunnel flight
JF Journal of Experimental Biology
JO J. Exp. Biol.
FD The Company of Biologists Ltd
SP 3109
OP 3120
DO 10.1242/jeb.01751
VO 208
IS 16
A1 Peters, Grant W.
A1 Steiner, Dee A.
A1 Rigoni, Jason A.
A1 Mascilli, Alexia D.
A1 Schnepp, Robert W.
A1 Thomas, Steven P.
YR 2005
UL http://jeb.biologists.org/content/208/16/3109.abstract
AB We made detailed cardiorespiratory measurements from homing pigeons during quiet rest and steady wind tunnel flight. Our pigeons satisfied their 17.4-fold increase in oxygen consumption during flight with a 7.4-fold increase in cardiac output (Q̇) and a 2.4-fold increase in blood oxygen extraction. Q̇ was increased primarily by increasing heart rate sixfold. Comparisons between our study and those from the only other detailed cardiorespiratory study on flying birds reveal a number of similarities and important differences. Although the avian allometric equations from this earlier study accurately predicted the flight Q̇ of our pigeons, this was primarily due to due to compensating discrepancies in their heart rate and stroke volume predictions. Additionally, the measured heart mass (MH)-specific Q̇ (Q̇/MH) of our pigeons during wind tunnel flight was about 22% lower than the estimated value. Compared to running mammals in previous studies, the 1.65-fold Q̇ of our pigeons is consistent with their larger heart mass.