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Fig. 4. Relationship between mass-specific rate of oxygen consumption (sO2, ml min-1 kg-1) and ambient temperature (Ta, °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, sO2=-0.057Ta+10.32, r2=0.021, P>0.06; below -5 °C, sO2=-0.343Ta+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.





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