Daily and photoperiod variations of basal and stress-induced corticosterone concentrations in house sparrows (Passer domesticus)

E. Rich, L. Romero

Research output: Contribution to journalArticlepeer-review

71 Scopus citations

Abstract

Corticosterone concentrations were measured in captive house sparrows (Passer domesticus) and found to vary both daily and with different photoperiods. Basal corticosterone was highest during the dark hours of the daily cycle and lowest during the light hours. This trend remained constant when the birds were held on short-day and long-day light cycles, and while the birds were undergoing a prebasic molt. At all times, corticosterone concentrations significantly increased in response to the stress of handling and restraint. Stress-induced corticosterone concentrations, however, only reflected a daily rhythm when the birds were held on short-days. Furthermore, even though mean basal corticosterone concentrations were equivalent over the short-day, long-day, and molt, total corticosterone output in response to stress was lower in molting birds, especially at night. Therefore, these data indicate that captive house sparrows modulate corticosterone in daily cycles that change in response to photoperiod.

Original languageEnglish
Pages (from-to)543-547
Number of pages5
JournalJournal of Comparative Physiology B: Biochemical, Systemic, and Environmental Physiology
Volume171
Issue number7
DOIs
StatePublished - 2001
Externally publishedYes

Keywords

  • Birds
  • Circadiel
  • Circannual
  • Corticosterone
  • Stress

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