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Figure 1


Fig. 1. Examples of oxygen consumption rates measured at different oxygen levels for individual 5-day-old embryos and newly hatched tadpoles of red-eyed treefrogs with and without external gills. Embryo measurements stopped at hatching. Lines show regression fits used to estimate Pcrit (arrows); data points above and below Pcrit are indicated by filled and open circles, respectively. Note that the x-axis location for the gilless embryo is shifted relative to that for the other animals.





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