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Journal of Experimental Biology, Vol 202, Issue 17 2269-2279, Copyright © 1999 by Company of Biologists
JOURNAL ARTICLES |
MA Chappell, C Bech and WA Buttemer
Australian Flora and Fauna Research Centre, Department of Biological Sciences, University of Wollongong, NSW 2522, Australia, Department of Biology, University of California, Riverside, CA 92521, USA and Department of Zoology, University of Science a.
We evaluated the relationship between organ mass and the limits to aerobic metabolism in house sparrows Passer domesticus. The results were used to test three models of performance limitation (the central limitation, peripheral limitation and symmorphosis concepts). Basal metabolic rate (BMR) was determined during the rest phase. The maximum rate of oxygen consumption during exercise ( v_dot (O2max)) was measured in an enclosed wheel that allowed limited hovering flight. Neither BMR nor v_dot (O2max) was affected by gender, but adults had significantly higher v_dot (O2max) and lower BMR than juveniles. The masses of most central organs (gut, gizzard, liver, heart, kidney and reproductive organs) differed significantly between ages. There were no gender differences in organ mass among juveniles, but liver mass differed between male and female adults. In the pooled data, BMR was positively correlated with the mass of three central organs (gut, liver and kidney) and with one peripheral effector (breast muscle); together, these explained more than half the variance in BMR (r(2)=0.57). In adults, BMR was positively correlated with the mass of reproductive tissue. The masses of one peripheral effector (breast muscle) and one central organ (the heart) were positively correlated with v_dot (O2max) (r(2)=0.17 for the pooled data set). These results are consistent with a symmorphosis model of aerobic capacity. We found a significant positive relationship between BMR and v_dot (O2max) in juveniles, but not in adults. Taken together, our data indicate that house sparrows can achieve elevated v_dot (O2max) without paying a 'penalty' (fitness trade-off) in the form of an increased BMR.
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