Core temperature variability in diving king penguins (Aptenodytes patagonicus): a preliminary analysis |
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Authors: | B M Culik K Pütz R P Wilson C A Bost Y Le Maho J -L Verselin |
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Institution: | 1. Institut für Meereskunde an der Universit?t Kiel, Düsternbrooker Weg 20, D-24105, Kiel, Germany 2. Centre d'Ecologie et Physiologie Energétiques, Centre National de la Recherche Scientifique, 23, Rue Becquerel, F-67087, Strasbourg, France 3. 32, Rue Gillet, F-68040, Ingersheim, France
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Abstract: | Core temperature was determined in two king penguins living in the wild at Ile de la Possession, Crozel Archipelago, using
implantable four-channel temperature loggers. Core temperatures derived from bird no. 1 (sensor placed under the sternum,
in the vicinity of the liver and upper stomach) were closely correlated with diving activity (as determined by an external
light recorder), and ranged from 38.3°C, (on land) to a minimum of 37.2°C during a dive. Core temperatures measured in bird
no. 2 showed that temperatures near the heart were generally 1°C lower than those under the sternum or in the lower abdomen.
Core temperatures declined continuously during dives (by 0.8, 1.2 and 2.7°C in the lower abdomen, under the sternum and near
the heart, respectively) and showed precipitous drops to 35°C, probably associated with ingestion of food. Temperatures measured
near the heart fluctuated over a period of 288 s, corresponding to the duration (from the literature) of the surface/dive
cycle. The relevance of these findings with respect to diving physiology, blood perfusion of tissues, tissue metabolism and
aerobic dive limits is discussed. |
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