A tropical bird can use the equatorial change in sunrise and sunset times to synchronize its circannual clock

Seasonal variation in daily insolation induces synchronous bud break and flowering in the tropics

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Geographically distinct reproductive schedules in a changing world: Costly implications in captive Stonechats

(2009) B. Helm   INTEGRATIVE AND COMPARATIVE BIOLOGY

Circannual Phase Response Curves to Short and Long Photoperiod in the European Hamster

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Circannual basis of geographically distinct bird schedules

(2009) B. Helm et al.   JOURNAL OF EXPERIMENTAL BIOLOGY

A circadian system is involved in photoperiodic entrainment of the circannual rhythm of Anthrenus verbasci

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ENDOGENOUS CIRCANNUAL RHYTHMICITY IN BODY MASS, MOLT, AND PLUMAGE OF GREAT KNOTS (CALIDRIS TENUIROSTRIS)

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