Changes in body temperature in king penguins at sea: the result of fine adjustments in peripheral heat loss?

American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
A SchmidtY Handrich

Abstract

To investigate thermoregulatory adjustments at sea, body temperatures (the pectoral muscle and the brood patch) and diving behavior were monitored during a foraging trip of several days at sea in six breeding king penguins Aptenodytes patagonicus. During inactive phases at sea (water temperature: 4-7 degrees C), all tissues measured were maintained at normothermic temperatures. The brood patch temperature was maintained at the same values as those measured when brooding on shore (38 degrees C). This high temperature difference causes a significant loss of heat. We hypothesize that high-energy expenditure associated with elevated peripheral temperature when resting at sea is the thermoregulatory cost that a postabsorptive penguin has to face for the restoration of its subcutaneous body fat. During diving, mean pectoral temperature was 37.6 +/- 1.6 degrees C. While being almost normothermic on average, the temperature of the pectoral muscle was still significantly lower than during inactivity in five out of the six birds and underwent temperature drops of up to 5.5 degrees C. Mean brood patch temperature was 29.6 +/- 2.5 degrees C during diving, and temperature decreases of up to 21.6 degrees C were recorded. Interestingly, we ob...Continue Reading

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Citations

May 23, 2008·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Benjamin ReyClaude Duchamp
Dec 30, 2008·The Journal of Experimental Biology·P J PonganisR Howard
Feb 27, 2007·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Yasuaki NiizumaYasuhiko Naito
Oct 21, 2017·The Journal of Experimental Biology·Agnès LewdenYves Handrich
Jun 18, 2017·The Journal of Experimental Biology·Agnès LewdenYves Handrich
Sep 30, 2006·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Andrej A Romanovsky
Jul 14, 2020·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Agnès LewdenDominic J McCafferty
Jan 16, 2007·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·J A GreenR L Holder
Sep 25, 2020·The Journal of Experimental Biology·Damien RousselClaude Duchamp
Jun 15, 2021·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Cassondra L Williams, Paul J Ponganis
Jun 17, 2021·The Journal of Experimental Biology·Manfred R EnstippYves Handrich

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