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Overview

circannual rhythm

Any biological rhythm involving a biological or psychological process that occurs or fluctuates at intervals of approximately one year, even in controlled environments from which seasonal ...

circannual rhythm

circannual rhythm n.   Quick reference

A Dictionary of Psychology (4 ed.)

Reference type:
Subject Reference
Current Version:
2015

... rhythm n. Any biological rhythm involving a biological or psychological process that occurs or fluctuates at intervals of approximately one year, even in controlled environments from which seasonal cues have been eliminated, such as the seasonal changes in behaviour of some migratory birds, which persist even under constant laboratory conditions from which fluctuations in temperature, daylight, and other seasonal cues have been excluded. See also biological clock , chronobiology , Zeitgeber . Compare circadian rhythm , infradian rhythm , ...

circannual rhythm

circannual rhythm  

Any biological rhythm involving a biological or psychological process that occurs or fluctuates at intervals of approximately one year, even in controlled environments from which seasonal cues have ...
circannual rhythms

circannual rhythms   Quick reference

A Dictionary of Animal Behaviour (2 ed.)

Reference type:
Subject Reference
Current Version:
2014
Subject:
Science and technology, Life Sciences
Length:
30 words

... rhythms Endogenous * rhythms in physiology and behaviour, that usually have (in isolation) a periodicity slightly less than 365 days. The endogenous rhythm is due to an internal * biological clock...

biological rhythm

biological rhythm  

Reference type:
Overview Page
Any periodic, more-or-less regular fluctuation or cycle in a biological system or process that is not wholly under the control of environmental cues but is controlled centrally by a biological clock. ...
breeding cycle

breeding cycle  

A cycle of sexual and parental behaviour and physiology. Among animals living at middle and high latitudes, the breeding cycle is usually seasonal.The reproductive physiology of seasonal breeders is ...
infradian rhythm

infradian rhythm  

Any biological rhythm with a period of less than a day. See alpha wave, basic rest-activity cycle, beta wave, delta wave, gamma wave, sensorimotor rhythm, theta wave. See also biological clock, ...
chronobiology

chronobiology  

The branch of biology concerned with biological rhythms. See biological clock, biological rhythm. See also alpha wave, basic rest-activity cycle, beta wave, circadian rhythm, circannual rhythm, delta ...
rhythm

rhythm  

Any sequence of regularly recurring functions or events, such as certain physiological processes (e.g. see circadian rhythm). Locomotory movements may also have a rhythm as in the regular repetition ...
ultradian

ultradian  

Reference type:
Overview Page
adj. denoting a biological rhythm or cycle that occurs more frequently than once in 24 hours. Compare circadian; nyctohemeral.
circadian rhythm

circadian rhythm  

Any 24-hour periodicity in the behaviour or physiology of animals or plants. Examples are the sleep/activity cycle in many animals and the growth movements of plants. Circadian rhythms are generally ...
biological clock

biological clock  

1. any mechanism that allows expression of specific genes at periodic intervals. 2. any physiological factor that regulates body rhythms. See clock mutants.
hibernation

hibernation  

A strategy for surviving winter cold that is characteristic of some mammals. Metabolic rate is reduced to a minimum and the animal enters a deep sleep, surviving on food reserves stored in the body ...
ultradian rhythm

ultradian rhythm n.   Quick reference

A Dictionary of Psychology (4 ed.)

Reference type:
Subject Reference
Current Version:
2015

...rhythm n . Any biological rhythm such as a circannual rhythm or a menstrual cycle with a period longer than a day. See also biological clock , chronobiology . Compare circadian rhythm , infradian rhythm . [From Latin ultra beyond + dies a...

chronobiology

chronobiology n.   Quick reference

A Dictionary of Psychology (4 ed.)

Reference type:
Subject Reference
Current Version:
2015

... n. The branch of biology concerned with biological rhythms . See biological clock , biological rhythm . See also alpha wave , basic rest–activity cycle , beta wave , circadian rhythm , circannual rhythm , delta wave , gamma wave , infradian rhythm , menstrual cycle , sensorimotor rhythm , sleep–wake cycle , suprachiasmatic nucleus , telomere , theta wave , ultradian rhythm , Zeitgeber . [From Greek chronos time + English biology...

infradian rhythm

infradian rhythm n.   Quick reference

A Dictionary of Psychology (4 ed.)

Reference type:
Subject Reference
Current Version:
2015

...rhythm n . Any biological rhythm with a period of less than a day. See alpha wave , basic rest–activity cycle , beta wave , delta wave , gamma wave , sensorimotor rhythm , theta wave . See also biological clock , chronobiology , Zeitgeber . Compare circadian rhythm , circannual rhythm , ultradian rhythm . [From Latin infra under + dies a...

annual rhythm

annual rhythm   Quick reference

A Dictionary of Biology (8 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Life Sciences
Length:
65 words

...annual rhythm ( circannual rhythm ) The occurrence of a process or a function in a living organism on a yearly basis. Events that display an annual rhythm can include life cycles, such as those of annual plants; mating behaviour; some kinds of movement, such as migration ; or growth patterns, such as the growth rings of woody plant stems. See also biorhythm...

biological rhythm

biological rhythm n.   Quick reference

A Dictionary of Psychology (4 ed.)

Reference type:
Subject Reference
Current Version:
2015

...rhythm n. Any periodic, more-or-less regular fluctuation or cycle in a biological system or process that is not wholly under the control of environmental cues but is controlled centrally by a biological clock . It may be an ultradian rhythm such as a circannual rhythm or a menstrual cycle ; a circadian rhythm such as the sleep–wake cycle ; or an infradian rhythm such as an alpha wave , basic rest–activity cycle , beta wave , delta wave , gamma wave , sensorimotor rhythm , or theta wave . See also chronobiology , pacemaker...

circadian rhythm

circadian rhythm n.   Quick reference

A Dictionary of Psychology (4 ed.)

Reference type:
Subject Reference
Current Version:
2015

...disorders , pineal gland , suprachiasmatic nucleus , Zeitgeber . Compare circannual rhythm , infradian rhythm , ultradian rhythm . [From Latin circa about + dies a...

Biological clocks

Biological clocks   Reference library

Magic Universe: A Grand Tour of Modern Science

Reference type:
Subject Reference
Current Version:
2009
Subject:
Science and technology, History of Science
Length:
2,824 words

...not just a daily, circadian clock but also a circannual clock, or calendar. Here the astronomical adaptation is to the tilt of the Earth's axis that governs the seasons of the year. The fact that the circannual clock in a caged bird never runs to exactly 365 days is evidence that it is internally self-engendered. Non-migratory birds also have biological calendars. Gwinner's team investigated how the stonechats, Saxicola torquata , resident in various parts of Africa and Eurasia, set and use their circannual clocks. To suit local conditions, their seasonal...

breeding cycle

breeding cycle   Quick reference

A Dictionary of Animal Behaviour (2 ed.)

Reference type:
Subject Reference
Current Version:
2014
Subject:
Science and technology, Life Sciences
Length:
95 words

...are anticipated. First, changes in ambient temperature, day length, or other environmental cues provide stimuli that induce physiological change at a particular time of year. Secondly, the physiological changes are programmed on a seasonal basis by means of an endogenous * circannual rhythm...

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