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Figure 4


Fig. 4. The relationship between whole-animal oxygen consumption rate (VO2; ml O2 h–1) and whole-animal ATP turnover rate per unit power output (mmol ATP h–1 W–1, assuming either perfect, Pper, or zero, Pzero, elastic storage) to respiratory quotient (RQ). The slope of whole-animal VO2 in relation to RQ is significantly different from zero (F1,22=10.4134, P=0.0039). The slopes of whole-animal ATP turnover rate per unit power output in relation to RQ are not significantly different from zero (assuming Pper, F1,22=1.8537, P=0.1871; assuming Pzero, F1,22=1.1524, P=0.2947). Note that >90% of VO2 and ATP turnover rate during hovering are accounted for by flight muscles. Example using Anna's hummingbird (C. anna) number 3.





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