Journal of Biological Rhythms publishes original, full-length reports in English of empirical investigations into all aspects of biological rhythmicity particularly rhythms related to the major environmental cycles, including daily (circadian) rhythms, tidal rhythms, annual rhythms (including photoperiodism), as well as other biological rhythms that interact with those rhythms influenced by the environment. Topics include genetic, biochemical, physiological, behavioral, and modeling approaches to understanding the nature, mechanisms, and functions of biological rhythms in all species.