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Fig. 1. The temperature dependence of arterial pH and
PCO2 and of whole-body CO2 stores
(CCO2) in tetrapods. Mean values of
 pH/T and of
CCO2/T (mmol
kg-1 body mass °C-1) are as tabulated by Stinner et
al. (1998 ). Mean values of
logPCO2/T, in
°C-1, are from the following sources (where there is more than
one per species, the means and ranges of individual means are shown): filled
circles, Coluber constrictor
(Stinner et al., 1998),
Varanus exanthematicus (Wood et
al., 1981); open circles, Trachemys scripta
(Jackson et al., 1974; Jackson
and Kagan, 1976; Hitzig,
1982), Alligator mississippiensis
(Davies, 1978), Chrysemys
picta (Nicol et al.,
1983; Glass et al.,
1985), Chelydra serpentina
(Howell et al., 1970),
Dipsosaurus dorsalis (Bickler,
1981); filled triangles, Bufo marinus
(Howell et al., 1970),
Rana catesbeiana (Howell et al.,
1970; Reeves,
1972; Mackenzie and Jackson, 1976). As described in the text, the
crosses A and B show representative values for the two distinct groups of
species (i.e. filled circles, and open circles together with filled
triangles).
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