Journal ArticleDOI
Circadian rhythm of activity during the annual phases in the European quail, Coturnix coturnix
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TLDR
Results appear to confirm the effects of physiological state on the temporal organisation of activity in migratory birds, and could influence the ability to synchronize with exogenous cycles such as the alternation of day and night.Abstract:
Migratory birds, such as the European quail, present an annual cycle with the following phases: moult, fattening, migration and reproduction This study aimed at determining how variations in the circadian rhythm of feeding during the annual cycle took endogenous rhythmic characteristics into account The birds (n = 8) were maintained under constant dim light from the age of 1 to 9 months Feeding activity was recorded using infra-red detectors The birds expressed all the phases, except migration Activity was arrhythmic when they were moulting A circadian rhythm of feeding activity appeared during the fattening phase In males, the circadian period lengthened and the clarity of the rhythm increased during sexual development These results appear to confirm the effects of physiological state on the temporal organisation of activity Variations of the circadian rhythm could influence the ability to synchronize with exogenous cycles such as the alternation of day and nightread more
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Journal ArticleDOI
Stable Individual Profiles of Daily Timing of Migratory Restlessness in European Quail
Aline Bertin,Cécilia Houdelier,Marie-Annick Richard-Yris,Catherine Guyomarc'h,Sophie Lumineau +4 more
TL;DR: Stable individual profiles in the daily time course of migratory restlessness in partial‐migrant European quail are shown, suggesting that their drive to migrate could be synchronized with particular skylight conditions.
Journal ArticleDOI
Rhythmic birds show a better social integration than arrhythmic birds.
TL;DR: Individual endogenous rhythms predict social integration in a group of standard chicks: R-chicks were more competent to gain access to food than were A-ch chicks, and separation from their group stressed R- chicks more than A-Chicks.
Journal ArticleDOI
Effect of Light Intensity on Circadian Activity in Developing Japanese Quail
TL;DR: It is postulate that two hierarchically coupled oscillators could control circadian feeding activity, and arrhythmia in LLbright could be the results of internal desynchronization of the pacemakers.
Journal ArticleDOI
Difference of social motivation in quail selected for divergent circadian activity
Laureline Formanek,Marie-Annick Richard-Yris,Christophe Petton,Cécilia Houdelier,Sophie Lumineau +4 more
TL;DR: Variation of circadian behavioral rhythmicity is associated with variation in social motivation in Japanese quail, andRhythmic animals appeared to respond more appropriately to environmental challenges than arrhythmmic animals.
References
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Book ChapterDOI
Circadian Systems: Entrainment
TL;DR: The circadian rhythmicity of eukaroytic organisms is dictated by an innate program that specifies the time course through the day of many aspects of metabolism and behavior, and this program is subject to entrainment by one or more of the external cycles whose period it closely approximates.
Journal ArticleDOI
Circannual clocks in avian reproduction and migration
TL;DR: Investigation on tropical birds such as the East African subspecies of the Stonechat and long-distance migrants like the Garden Warbler have provided the longest records of circannual rhythms, some of them running for more than 12 years, with periods ranging from about 9 to 13 months.
Journal ArticleDOI
Gonadal hormones organize and modulate the circadian system of the rat.
TL;DR: The circadian wheel-running rhythms of gonadectomized adult male, female, and perinatally androgenized female rats, maintained in constant darkness, were examined before and after implantation of Silastic capsules containing cholesterol (C) or estradiol-17 beta (E).
Journal ArticleDOI
Testosterone Induces "Splitting" of Circadian Locomotor Activity Rhythms in Birds
TL;DR: Results suggest that testosterone affects the mutual coupling of circadian oscillators controlling locomotor activity in intact birds whose testes grew, and in castrated birds that were injected with testosterone.