The locomotory activity rhythm of the spiny mouse, Acomys spinosissimus from southern Africa : light entrainment and endogenous circadian rhythms

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dc.contributor.author Hoole, Carol
dc.contributor.author Oosthuizen, Maria Kathleen
dc.contributor.author Chimimba, Christian Timothy
dc.contributor.author Bennett, Nigel C., 1961-
dc.date.accessioned 2017-01-13T07:56:59Z
dc.date.available 2017-01-13T07:56:59Z
dc.date.issued 2012-10
dc.description.abstract The circadian rhythm of locomotor activity in the spiny mouse, Acomys spinosissimus from South Africa was investigated under controlled laboratory conditions. Nine individuals were subjected to six successive light cycles of approximately two weeks each as follows: 1) a standard light/dark (12:12LD) cycle, 2) a period of constant darkness (DD), 3) a second standard light/dark (12L:12D) cycle, 4) an inverse of the LD (12:12DL) cycle, 5) a short day cycle (8:16LD) and 6) a long day cycle (16:8LD). All the animals exhibited entrainment of their activity to the LD and DL lighting regimes. Locomotor activity of A. spinosissimus occurred predominantly during the dark phases of the LD, DL, long day and short day cycles. Under LD, the mean percentage of activity was 88.7% ± 0.07% during the dark phase. When subjected to constant darkness all animals expressed free-running rhythms of locomotor activity (Mean ± 1SD = 23.81h ± 0.33h; range = 23.2 h – 24.1 h). On the reverse LD cycle, the mean percentage of activity was 81.4% ± 0.09% during the dark phase of the cycle. Mice exhibited significantly more daytime activity during the long day cycle (20.3% ± 5.8%;) and no significant change in dark phase activity during the short day cycle (90.1% ± 4.01%;). The spiny mouse possesses a circadian rhythm of locomotor activity that entrains strongly to light. Locomotory activity occurs predominantly during the dark phase and can therefore be considered a nocturnal mammal. en_ZA
dc.description.department Mammal Research Institute en_ZA
dc.description.department Zoology and Entomology en_ZA
dc.description.librarian hb2016 en_ZA
dc.description.sponsorship The DST-NRF for funding the South African Research Chair of Mammalian Behavioural Ecology and Physiology to NCB. en_ZA
dc.description.uri http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1469-7998 en_ZA
dc.identifier.citation Hoole, C, Oosthuizen, MK, Chimimba, CT & Bennett, NC 2012, 'The locomotory activity rhythm of the spiny mouse, Acomys spinosissimus from southern Africa : light entrainment and endogenous circadian rhythms', Journal of Zoology, vol. 288, no.2, pp. 93-102. en_ZA
dc.identifier.issn 0952-8369 (print)
dc.identifier.issn 1469-7998 (online)
dc.identifier.other 10.1111/j.1469-7998.2012.00928.
dc.identifier.uri http://hdl.handle.net/2263/58510
dc.language.iso en en_ZA
dc.publisher Wiley en_ZA
dc.rights © The Authors. Journal of Zoology © 2012 The Zoological Society of London. This is the pre-peer reviewed version of the following article : (name of article), Journal of Zoology, vol. 288, no. 2, pp. 93-102, 2012. doi : 10.1111/j.1469-7998.2012.00928.x. The definite version is available at : http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1469-7998. en_ZA
dc.subject Circadian rhythms en_ZA
dc.subject Entrainment en_ZA
dc.subject Light en_ZA
dc.subject Southern Africa en_ZA
dc.subject Spiny mouse (Acomys spinosissimus) en_ZA
dc.title The locomotory activity rhythm of the spiny mouse, Acomys spinosissimus from southern Africa : light entrainment and endogenous circadian rhythms en_ZA
dc.type Postprint Article en_ZA


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