Circannual rhythms

Vinod Kumar, Ila Mishra

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

7 Scopus citations


Circannual rhythms have evolved as genetically programmed adaptive timing mechanisms to allow organisms use favorable seasons to reproduce and grow, and survive through unfavorable seasons. These govern seasonal changes in the physiology and behavior, and hence optimize offspring survival by coordinating reproductive efforts at the best-suited time of the year, and overall fitness in the periodic world. Here, we define and describe formal properties and synchronization of circannual rhythms, provide several examples of circannual rhythm mediated seasonal events, and discuss putative mechanisms and recent advances in elucidating the mechanism(s) of circannual timing in birds and mammals.

Original languageEnglish
Title of host publicationEncyclopedia of Reproduction
Number of pages9
ISBN (Electronic)9780128151457
StatePublished - Jan 1 2018

Bibliographical note

Publisher Copyright:
© 2018 Elsevier Inc. All rights reserved.


  • Biological clock
  • Biological rhythm
  • Circadian rhythm
  • Circannual rhythm
  • Entrainment
  • Free-running
  • Gonad
  • Hibernation
  • Light-dark cycle
  • Molt
  • Period
  • Phase
  • Pperiod
  • Reproduction
  • Seasonality
  • Synchronization
  • Temperature

ASJC Scopus subject areas

  • General Medicine


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