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Auteur (up) Vuarin, P.; Henry, P.-Y. openurl 
  Titre Field evidence for a proximate role of food shortage in the regulation of hibernation and daily torpor: a review Type Article scientifique
  Année 2014 Publication Journal Of Comparative Physiology B-Biochemical Systemic And Environmental Physiology Revue Abrégée  
  Volume 184 Numéro 6 Pages 683-697  
  Résumé Hibernation and daily torpor (heterothermy)

have long been assumed to be adaptive responses to seasonal

energy shortage. Laboratory studies have demonstrated

that food shortage alone can trigger the use of heterothermy.

However, their potential to predict heterothermic

responses in the wild is limited, and few field studies demonstrate

the dependence of heterothermy on food availability

under natural conditions. Thus, the view of heterothermy

as an energy saving strategy to compensate for food

shortage largely remains an untested hypothesis. In this

paper, we review published evidence on the proximate role

of food availability in heterothermy regulation by endotherms,

and emphasize alternative hypotheses that remain

to be tested. Most studies have relied on correlative evidence.

Manipulations of food availability, that demonstrate

the proximate role of food availability, have been conducted

in only five free-ranging heterotherms. Several other

metabolic constraints covary with food availability and can

confound its effect. Shortage in water availability, the nutritional

composition of food, or subsequent conversion of

food in fat storage all could be actual proximate drivers of

heterothermy regulation, rather than food shortage. Social

interactions, competition for food and predation also likely

modulate the relative strength of food shortage between

individuals. The ecological relevance of the dependence of

heterothermy on food availability remains to be assessed in field experiments that account for the confounding effects

of covarying environmental and internal factors.
  Auteur institutionnel Thèse  
  Editeur Lieu de Publication Éditeur  
  Langue Langue du Résumé Titre Original  
  Éditeur de collection Titre de collection Titre de collection Abrégé  
  Volume de collection Numéro de collection Edition  
  ISSN 0174-1578 ISBN Médium  
  Région Expédition Conférence  
  Notes WOS:000339886800001 Approuvé pas de  
  Numéro d'Appel MNHN @ henry @ collection 546  
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