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Fig. 2. Partitioning of gas transfer between the air (lungs) and water (gills/skin) in P. dolloi (N=11). (A) Absolute rates of O2 uptake (O2) and CO2 excretion (CO2) derived from the air (filled component of bar) and water (unfilled component of bar). The S.E.M. for total (sum of air plus water) gas transfer is denoted in the upward direction whereas those for aerial or aquatic gas transfer are denoted in the downward direction. (B) The relative proportions of aerial O2 and CO2.