Fig. 6. Resting oxygen pulse (ROP) of 26 king penguins at a variety of temperatures plotted against the nutritional index (NI, for details, see text). The solid black line is the regression line between ROP and NI for resting penguins at a variety of temperatures (ROP=1.09+0.096NI, r²=0.32, P=0.015), and the thin grey line and the dotted line are the regression lines between NI and the resting oxygen pulse (ROP) above and below the lower critical temperature, respectively. The thick grey line is the ROP obtained in the previous study (Froget et al., 2001).

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