Intra-individual variation in body temperature and pectoral muscle size in nestling Alpine swifts Apus melba in response to an episode of inclement weather

Pierre Bize*, Aurelie Klopfenstein, Caroline Jeanneret, Alexandre Roulin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


The Alpine swift (Apus melba) forages on insects caught exclusively on the wing, implying that dependent nestlings face acute food shortage in periods of cold and rainy weather. Therefore, there should be strong selection on nestling swifts to evolve physiological strategies to cope with periods of undernutrition. We have investigated intra-individual changes in nestling pectoral muscle and body temperature in response to a 1-week period of inclement weather. The pectoral muscle is the largest reserves of proteins, and nestlings have to devote a large amount of energy in the maintenance of body temperature. The results show that nestling pectoral muscle size and body temperature were significantly reduced during the episode of inclement weather. Assuming that these physiological changes are adaptive, our study suggests that nestling swifts spare energy by a pronounced reduction (up to 18 degrees C) in body temperature and use proteins from the pectoral muscle as a source of extra energy to survive prolonged periods of fasting.

Original languageEnglish
Pages (from-to)387-393
Number of pages7
JournalJournal of Ornithology
Issue number4
Early online date19 Jun 2007
Publication statusPublished - Oct 2007


  • pectoral muscle
  • starvation
  • torpor
  • weather condition
  • food shortage
  • organ size
  • growth
  • physiology
  • protein
  • chicks
  • flight
  • mass

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