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. 2011 Feb 16;7(4):601–604. doi: 10.1098/rsbl.2010.1171

Figure 1.

Figure 1.

Effect of relative humidity (RH) and water vapour on the 18O composition of the haemolymph of P. americana. (a) With drinking water at 50 versus 98% RH, while breathing enriched vapour at −18‰ from local UK tap water; (b) with drinking water at 50 versus 98% RH, while breathing depleted vapour at −22‰ from Vienna tap water; (c) without drinking water at 50 versus 98% RH, while breathing enriched vapour at −18‰ from local UK tap water; and (d) without drinking water at 50 versus 98% RH, while breathing depleted vapour at −22‰ from Vienna tap water (filled circles, observed; open circles, predicted).