Circadian and circatidal clocks control the mechanism of semilunar foraging behaviour

Abstract How animals precisely time behaviour over the lunar cycle is a decades-old mystery. Experiments on diverse species show this behaviour to be endogenous and under clock control but the mechanism has remained elusive. We present new experimental and analytical techniques to test the hypothese...

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Autores principales:	James F. Cheeseman, Rachel M. Fewster, Michael M. Walker
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/5d700afd832d4f90b88c5173df38a2fd
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spelling	oai:doaj.org-article:5d700afd832d4f90b88c5173df38a2fd2021-12-02T12:32:15ZCircadian and circatidal clocks control the mechanism of semilunar foraging behaviour10.1038/s41598-017-03245-32045-2322https://doaj.org/article/5d700afd832d4f90b88c5173df38a2fd2017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-03245-3https://doaj.org/toc/2045-2322Abstract How animals precisely time behaviour over the lunar cycle is a decades-old mystery. Experiments on diverse species show this behaviour to be endogenous and under clock control but the mechanism has remained elusive. We present new experimental and analytical techniques to test the hypotheses for the semilunar clock and show that the rhythm of foraging behaviour in the intertidal isopod, Scyphax ornatus, can be precisely shifted by manipulating the lengths of the light/dark and tidal cycles. Using light T-cycles (Tcd) the resultant semilunar beat period undergoes shifts from 14.79 days to 6.47 days under T = 23 hours (h), or to 23.29 days under T = 24.3 h. In tidal T-cycles (Tt) of natural length Tt = 12.42 h, the semilunar rhythm is shifted to 24.5 days under Tt = 12.25 h and to 9.7 days under Tt = 12.65 h. The implications of this finding go beyond our model species and illustrate that longer period rhythms can be generated by shorter period clocks. Our novel analysis, in which periodic spline models are embedded within randomization tests, creates a new methodology for assessing long-period rhythms in chronobiology. Applications are far-reaching and extend to other species and rhythms, potentially including the human-ovarian cycle.James F. CheesemanRachel M. FewsterMichael M. WalkerNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-7 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q James F. Cheeseman Rachel M. Fewster Michael M. Walker Circadian and circatidal clocks control the mechanism of semilunar foraging behaviour
description	Abstract How animals precisely time behaviour over the lunar cycle is a decades-old mystery. Experiments on diverse species show this behaviour to be endogenous and under clock control but the mechanism has remained elusive. We present new experimental and analytical techniques to test the hypotheses for the semilunar clock and show that the rhythm of foraging behaviour in the intertidal isopod, Scyphax ornatus, can be precisely shifted by manipulating the lengths of the light/dark and tidal cycles. Using light T-cycles (Tcd) the resultant semilunar beat period undergoes shifts from 14.79 days to 6.47 days under T = 23 hours (h), or to 23.29 days under T = 24.3 h. In tidal T-cycles (Tt) of natural length Tt = 12.42 h, the semilunar rhythm is shifted to 24.5 days under Tt = 12.25 h and to 9.7 days under Tt = 12.65 h. The implications of this finding go beyond our model species and illustrate that longer period rhythms can be generated by shorter period clocks. Our novel analysis, in which periodic spline models are embedded within randomization tests, creates a new methodology for assessing long-period rhythms in chronobiology. Applications are far-reaching and extend to other species and rhythms, potentially including the human-ovarian cycle.
format	article
author	James F. Cheeseman Rachel M. Fewster Michael M. Walker
author_facet	James F. Cheeseman Rachel M. Fewster Michael M. Walker
author_sort	James F. Cheeseman
title	Circadian and circatidal clocks control the mechanism of semilunar foraging behaviour
title_short	Circadian and circatidal clocks control the mechanism of semilunar foraging behaviour
title_full	Circadian and circatidal clocks control the mechanism of semilunar foraging behaviour
title_fullStr	Circadian and circatidal clocks control the mechanism of semilunar foraging behaviour
title_full_unstemmed	Circadian and circatidal clocks control the mechanism of semilunar foraging behaviour
title_sort	circadian and circatidal clocks control the mechanism of semilunar foraging behaviour
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/5d700afd832d4f90b88c5173df38a2fd
work_keys_str_mv	AT jamesfcheeseman circadianandcircatidalclockscontrolthemechanismofsemilunarforagingbehaviour AT rachelmfewster circadianandcircatidalclockscontrolthemechanismofsemilunarforagingbehaviour AT michaelmwalker circadianandcircatidalclockscontrolthemechanismofsemilunarforagingbehaviour
_version_	1718394096526032896

Circadian and circatidal clocks control the mechanism of semilunar foraging behaviour

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