Thermal strategies of king penguins during prolonged fasting in water
| Autor: | Manfred R. Enstipp, Jean-Yves Georges, Agnès Lewden, C. A. Bost, Yves Handrich, Batshéva Bonnet |
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| Přispěvatelé: | Département Ecologie, Physiologie et Ethologie (DEPE-IPHC), Institut Pluridisciplinaire Hubert Curien (IPHC), Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA), Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC), Institut National de la Recherche Agronomique (INRA)-Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
030110 physiology
0301 basic medicine subcutaneous fat Physiology Oceans and Seas Foraging Aquatic Science Biology fat mobilization Subcutaneous fat Thermoregulation 03 medical and health sciences heat loss Animal science Peripheral perfusion Stress Physiological Animals 14. Life underwater Molecular Biology Ecology Evolution Behavior and Systematics normothermia Ecology Heat losses Fasting Spheniscidae Physiological responses Adipose Tissue Insect Science Stored energy [SDE]Environmental Sciences Animal Science and Zoology Energy Metabolism Perfusion seabirds Body Temperature Regulation |
| Zdroj: | Journal of Experimental Biology Journal of Experimental Biology, Cambridge University Press, 2017, 220 (24), pp.4600-4611. ⟨10.1242/jeb.168807⟩ Journal of Experimental Biology, The Company of Biologists, 2017, 220 (24), pp.4600-4611. ⟨10.1242/jeb.168807⟩ |
| ISSN: | 0022-0949 1477-9145 |
| DOI: | 10.1242/jeb.168807⟩ |
| Popis: | International audience; Most animals experience periods of unfavourable conditions, challenging their daily energy balance. During breeding, king penguins fast voluntarily for up to 1.5 months in the colony, after which they replenish their energy stores at sea. However, at sea, birds might encounter periods of low foraging profitability, forcing them to draw from previously stored energy (e.g. subcutaneous fat). Accessing peripheral fat stores requires perfusion, increasing heat loss and thermoregulatory costs. Hence, how these birds balance the conflicting demands of nutritional needs and thermoregulation is unclear. We investigated the physiological responses of king penguins to fasting in cold water by: (1) monitoring tissue temperatures, as a proxy of tissue perfusion, at four distinct sites (deep and peripheral); and (2) recording their oxygen consumption rate while birds floated inside a water tank. Despite frequent oscillations, temperatures of all tissues often reached near-normothermic levels, indicating that birds maintained perfusion to peripheral tissues throughout their fasting period in water. The oxygen consumption rate of birds increased with fasting duration in water, while it was also higher when the flank tissue was warmer, indicating greater perfusion. Hence, fasting king penguins in water maintained peripheral perfusion, despite the associated greater heat loss and, therefore, thermoregulatory costs, probably to access subcutaneous fat stores. Hence, the observed normothermia in peripheral tissues of king penguins at sea, upon completion of a foraging bout, is likely explained by their nutritional needs: depositing free fatty acids (FFA) in subcutaneous tissues after profitable foraging or mobilizing FFA to fuel metabolism when foraging success was insufficient. |
| Databáze: | OpenAIRE |
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