JEB -- Froget et al. 205 (16): 2511 Figure IG4

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Fig. 4. Relationship between mass-specific rate of oxygen consumption (s_O₂, ml min^-1 kg^-1) and ambient temperature (T_a, °C) in 31 adult king penguins. The regression lines for mass-specific rate of oxygen consumption versus ambient temperature are as follows: above -5 °C, s_O₂=-0.057T_a+10.32, r²=0.021, P>0.06; below -5 °C, s_O₂=-0.343T_a+8.93, r²=0.43, P<0.0001. The two regression lines intersect at -4.9 °C, the lower critical temperature (LCT). Values are means ± S.E.M., N=203.