Du är här

Nocturnal body temperature in wintering blue tits is affected by roost-site temperature and body reserves.

Publiceringsår: 2011
Språk: Engelska
Sidor: 21-25
Publikation/Tidskrift/Serie: Oecologia
Volym: 167
Dokumenttyp: Artikel
Förlag: Springer-Verlag

Sammanfattning

Birds commonly use rest-phase hypothermia, a controlled reduction of body temperature (T (b)), to conserve energy during times of high metabolic demands. We assessed the flexibility of this heterothermic strategy by increasing roost-site temperature and recording the subsequent T (b) changes in wintering blue tits (Cyanistes caeruleus L.), assuming that blue tits would respond to treatment by increasing T (b). We found that birds increased T (b) when roost-site temperature was increased, but only at low ambient temperatures. Moreover, birds with larger fat reserves regulated T (b) at higher levels than birds carrying less fat. This result implies that a roosting blue tit maintains its T (b) at the highest affordable level, as determined by the interacting effect of ecophysiological costs associated with rest-phase hypothermia and energy reserves, in order to minimize potential fitness costs associated with a low T (b).

Disputation

Nyckelord

  • Biology and Life Sciences
  • Body temperature – Fat reserves – Heterothermia – Hypothermia – Roosting

Övriga

Published
  • CAnMove
Yes
  • ISSN: 1432-1939 (Online)
  • ISSN: 0029-8549 (Print)

Box 117, 221 00 LUND
Telefon 046-222 00 00 (växel)
Telefax 046-222 47 20
lu [at] lu [dot] se

 

Fakturaadress: Box 188, 221 00 LUND
Organisationsnummer: 202100-3211
Om webbplatsen