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Hypothermia in foraging king penguins

Abstract

The ability to dive for long periods increases with body size1, but relative to the best human divers, marine birds and mammals of similar or even smaller size are outstanding performers. Most trained human divers can reach a little over 100 m in a single-breath dive lasting for 4 min (ref. 2), but king and emperor penguins (weighing about 12 and 30 kg, respectively) can dive to depths of 304 and 534 m for as long as 7.5 and 15.8 min, respectively3,4,5. On the basis of their assumed metabolic rates, up to half of the dive durations were believed to exceed the aerobic dive limit, which is the time of submergence before all the oxygen stored in the body has been used up4,6,7. But in penguins and many diving mammals7,8, the short surface intervals between dives are not consistent with the recovery times associated with a switch to anaerobic metabolism4. We show here that the abdominal temperature of king penguins may fall to as low as 11 °C during sustained deep diving. As these temperatures may be 10 to 20 °C below stomach temperature, cold ingested food cannot be the only cause of abdominal cooling. Thus, the slower metabolism of cooler tissues resulting from physiological adjustments associated with diving per se, could at least partly explain why penguins and possibly marine mammals can dive for such long durations.

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Figure 1: Sagittal view of the abdominal region of a king penguin showing the location of three recorders: R1, time/temperature recorder located in the stomach; R2, time/temperature/depth recorder implanted in the abdominal fat of the lower abdomen, with an external thermistor placed against the stomach wall; R3, time/temperature/heart rate recorder implanted under the sternum and against the stomach wall in the upper abdomen.
Figure 2: Typical data obtained from a single bird corresponding to: (1) the end of the brooding shift (range, 5–10 d; mean ± s.d.: 7.3 ± 1.9, n = 12); (2) the foraging trip (range 5.1–10.2 d; mean, 7.5 ± 1.6); (3) the beginning of the following brooding shift (less than 36 h).
Figure 3: Representative changes of the three recorded temperatures during different diving activity two days before the end of the foraging trip (bird N departed on 21 February at 08:02 h for 10.5 d of foraging), showing the temporal changes in temperature that occur inside the abdominal cavity.
Figure 4: Short-term variations of the three abdominal temperatures near the end of a deep-diving bout and 1 d before the end of the foraging trip (bird O returns to the chick on 01 March at 16:08 h after 8.2 d at sea).

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Acknowledgements

We thank G. Froget, Y. Ropert-Coudert, J.-N. Clech and all the 1995 winter team in Crozet for their assistance in the field, and A. Ancel, C.-A. Bost, B. M. Culik and A. Malan for comments on the manuscript. After approval by the ethics committee of the Institut Français pour la Recherche et la Technologie Polaires, this study was supported by a grant for this Institute and by an NERC Small Research grant.

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Correspondence to Y. Handrich.

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Handrich, Y., Bevan, R., Charrassin, JB. et al. Hypothermia in foraging king penguins. Nature 388, 64–67 (1997). https://doi.org/10.1038/40392

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