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Fig. 2. (A) A recording of falling [O2] in the closed respirometer. (B) The graph is derived from A and shows the O2 consumption at different levels of ambient [O2]. Variables derived from the measurements of O2 consumption in G. histrio are indicated in A and B. O2 is the normoxic O2 consumption, and [O2]crit is the critical O2 concentration (below which the animal loses the ability to regulate its O2 consumption). (C) The ventilatory frequency at different O2 concentrations measured during respirometry (means ± S.E.M. of 11 individuals of both forms of G. histrio). A and B are from a typical animal, and the variables measured from several animals are given in Table 1. *P<0.05 compared with any of the 70%, 80% and 90% values (Dunn's test).





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