The circadian rhythm of thermoregulation in Japanese quail

Underwood, Herbert

doi:10.1007/bf00199485

Cited by 51 publications

(68 citation statements)

References 27 publications

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“…Such day/night variations have already been described in oscines (Hultsch 1980), and could be driven by the hormone melatonin, since both songbirds and nonsongbirds species exhibit melatonin receptors in brain areas that control vocal production (Cozzi et al 1993;Gahr & Kosar 1996;Jansen et al 2005). Alternatively, given the recent discovery that zebra finch songs slow when specific brain nuclei are cooled (Long & Fee 2008), melatonin could also influence crows indirectly through its role in the regulation of the circadian rhythm in brain and body temperature (Aschoff et al 1973;Underwood 1994;Doi et al 2002) and associated brain cooling at night (Aschoff et al 1973;Doi et al 2002). Additional experiments are required to evaluate this hypothesis.…”

Section: Discussionmentioning

confidence: 90%

Dynamics of crowing development in the domestic Japanese quail (Coturnix coturnix japonica)

2009

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Species-specific behaviours gradually emerge, via incomplete patterns, to the final complete adult form. A classical example is birdsong, a learned behaviour ideally suited for studying the neural and molecular substrates of vocal learning. Young songbirds gradually transform primitive unstructured vocalizations (subsong, akin to human babbling) into complex, stereotyped sequences of syllables that constitute adult song. In comparison with birdsong, territorial and mating calls of vocal non-learner species are thought to exhibit little change during development. We revisited this issue using the crowing behaviour of domestic Japanese quail (Coturnix coturnix japonica). Crowing activity was continuously recorded in young males maintained in social isolation from the age of three weeks to four months. We observed developmental changes in crow structure, both the temporal and the spectral levels. Speed and trajectories of these developmental changes exhibited an unexpected high inter-individual variability. Mechanisms used by quails to transform sounds during ontogeny resemble those described in oscines during the sensorimotor phase of song learning. Studies on vocal non-learners could shed light on the specificity and evolution of vocal learning.

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Section: Discussionmentioning

confidence: 90%

Dynamics of crowing development in the domestic Japanese quail (Coturnix coturnix japonica)

2009

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“…Lesions of the hypothalamic pacemaker result in severe impairment of rhythmicity in the pineal intact house sparrow (Takahashi and Menaker 1982). Similarly, complete removal of eyes (blinding) produces arrhythmicity in the Japanese quail (Underwood 1994).…”

Section: Discussionmentioning

confidence: 98%

The pineal clock affects behavioral circadian rhythms but not photoperiodic induction in the Indian weaver bird (Ploceus philippinus)

2005

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We investigated whether pineal is part of the circadian clock system which regulates circadian rhythms of activity and photosensitivity in the Indian weaver bird (Ploceus philippinus). Two experiments were performed. The first experiment examined the induction of testicular growth, and androgen-dependent beak pigmentation and luteinizing hormone (LH)-specific plumage coloration in pinealectomised (pinx) and shamoperated (sham) birds exposed to short day (8 h light: 16 h darkness, 8L:16D) and long day (16L:8D) for 9 months in the late breeding and early regressive phase (October), or the late regressive and preparatory phase (January) of the annual testicular cycle. As expected, short days were non-stimulatory, and long days stimulated testicular growth, beak pigmentation and plumage coloration. There was no difference in the response between pinx and sham birds subjected to short or long days in October, but the response was enhanced in pinx birds that were subjected to long day in January. In the second experiment circadian behavioral rhythms were studied (activity pattern in singly housed birds) in weaver birds first exposed at two different phases of the annual testicular cycle to a stimulatory photoperiod (12L:12D in preparatory phase or 13L:11D in early breeding phase) and then released into dim continuous light (LL dim ). All birds showed synchronization to the light period before and after the pinealectomy; there was no difference in the response between pinx and sham birds. When released into LL dim , sham birds exhibited circadian rhythmicity continuously, whereas pinx birds lost circadian rhythmicity after some cycles. Considered together, these results suggest that circadian clock residing within the pineal gland regulates the circadian rhythm in activity, but not the circadian rhythm involved in photoperiodic induction of the Indian weaver bird.

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“…In a previous study, it was shown that the lesions of the hypothalamic pacemaker resulted in severe impairment of the rhythmicity in pineal intact House Sparrows (Takahashi and Menaker 1982). Similarly, complete removal of eyes (blinding) produced arrhythmicity in the Japanese Quail (Underwood 1994). In all probability, therefore, the pineal interacts with the hypothalamic oscillator and possibly the retinal oscillator .…”

Section: Circadian System In the Indian Weaver Bird: Role Of Pineal Gmentioning

confidence: 94%

Photoperiodism, pineal clock and seasonal reproduction in the Indian Weaver Bird (Ploceus philippinus)

2007

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Previous studies show that, in birds, pineal melatonin is important for circadian rhythmicity, and circadian rhythms mediate photoperiodic effects. The effect of pinealectomy or melatonin administration in photoperiodic induction of testicular growth is not found in many bird species. This is inconsistent with the fact that avian pineal is a self-sustained circadian biological clock and decodes both the daily and annual photoperiodic information. Does this mean that the pineal clock in birds regulates circadian rhythms, but not the one that is involved in the photoperiodic induction of the seasonal response? We have examined this in experiments on the subtropical Indian Weaver Bird (Ploceus philippinus). We investigated the effects of the absence of the pineal gland or exogenous melatonin administration on circadian rhythmicity in activity, and on photoperiodic induction of testicular growth, androgen-dependent beak pigmentation and luteinizing hormone-specific plumage coloration. Weaver birds were subjected for several weeks to short day length (8 h light: 16 h darkness, 8L:16D), long day length (16L:8D) and to light-dark cycles that tested the involvement of circadian rhythmicity in photoperiodic time measurement. The results show that circadian pineal clock may regulate the circadian rhythm in activity, but is not essential for the expression of photoperiodism associated with the photoperiodic induction of testicular growth. This suggests that the circadian activity and photosensitivity rhythms are outputs of different circadian oscillators or of the same set of circadian oscillators, but that they are not closely coupled.

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The circadian rhythm of thermoregulation in Japanese quail

Cited by 51 publications

References 27 publications

Dynamics of crowing development in the domestic Japanese quail (Coturnix coturnix japonica)

Dynamics of crowing development in the domestic Japanese quail (Coturnix coturnix japonica)

The pineal clock affects behavioral circadian rhythms but not photoperiodic induction in the Indian weaver bird (Ploceus philippinus)

Photoperiodism, pineal clock and seasonal reproduction in the Indian Weaver Bird (Ploceus philippinus)

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