AJP - Regu Watch the video to learn how APS reaches out to developing nations.
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Am J Physiol Regul Integr Comp Physiol 279: R2104-R2112, 2000;
0363-6119/00 $5.00
This Article
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in Web of Science
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Web of Science (11)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Groscolas, R.
Right arrow Articles by Robin, J.-P.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Groscolas, R.
Right arrow Articles by Robin, J.-P.
Vol. 279, Issue 6, R2104-R2112, December 2000

Refeeding signal in fasting-incubating king penguins: changes in behavior and egg temperature

R. Groscolas, F. Decrock, M.-A. Thil, C. Fayolle, C. Boissery, and J.-P. Robin

Centre d'Ecologie et Physiologie Energétiques, Centre National de la Recherche Scientifique, 67087 Strasbourg Cedex, France

This study is directed toward understanding the process of feeding stimulation ("refeeding signal") that has been suggested to operate below a body mass threshold or critical metabolic status in spontaneously fasting birds. Behavior and egg temperature (Tegg) were continuously monitored by video monitoring and biotelemetry, respectively, in fasting-incubating king penguins kept in a pen to prevent relief by the partner until spontaneous egg abandonment. Penned birds fasted 10 days more and lost 1.2 kg more than birds relieved normally by their partner, abandoning the egg about 1 wk after reaching a critical body mass. Definitive egg abandonment was preceded by transitory abandonments of progressively increasing duration during which time the birds went further and further away from their egg. There were marked interindividual differences but on average transitory abandonments began 36 ± 5 h before the definitive abandonment and were paralleled by resumption of display songs signaling the readiness of the bird to depart for feeding. Tegg was maintained at around 35.7°C during normal incubation but significantly decreased the last 2 days before egg abandonment. These changes are interpreted as reflecting a stimulation to refeed at a threshold body mass corresponding to a critical fat store depletion. Thus the fasting-incubating king penguin appears to be an interesting animal model for understanding the long-term metabolic control of feeding behavior in relation to energy status.

feeding behavior; spontaneous fasting; incubation; fat stores; body mass threshold; birds


This article has been cited by other articles:


Home page
 Am. J. Physiol. Regul. Integr. Comp. Physiol.Home page
A. Fahlman, Y. Handrich, A. J. Woakes, C.-A. Bost, R. Holder, C. Duchamp, and P. J. Butler
Effect of fasting on the VO2-fh relationship in king penguins, Aptenodytes patagonicus
Am J Physiol Regulatory Integrative Comp Physiol, October 1, 2004; 287(4): R870 - R877.
[Abstract] [Full Text] [PDF]

Home page
 Am. J. Physiol. Regul. Integr. Comp. Physiol.Home page
S. F. Bernard, J. Orvoine, and R. Groscolas
Glucose regulates lipid metabolism in fasting king penguins
Am J Physiol Regulatory Integrative Comp Physiol, August 1, 2003; 285(2): R313 - R320.
[Abstract] [Full Text] [PDF]

Home page
 Am. J. Physiol. Regul. Integr. Comp. Physiol.Home page
S. F. Bernard, M.-A. Thil, and R. Groscolas
Lipolytic and metabolic response to glucagon in fasting king penguins: phase II vs. phase III
Am J Physiol Regulatory Integrative Comp Physiol, February 1, 2003; 284(2): R444 - R454.
[Abstract] [Full Text] [PDF]

Home page
 J. Exp. Biol.Home page
S. F. Bernard, C. Fayolle, J.-P. Robin, and R. Groscolas
Glycerol and NEFA kinetics in long-term fasting king penguins: phase II versus phase III
J. Exp. Biol., September 1, 2002; 205(17): 2745 - 2754.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Visit Other APS Journals Online