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

dc.contributor.authorHoole, Carol
dc.contributor.authorOosthuizen, Maria Kathleen
dc.contributor.authorChimimba, Christian Timothy
dc.contributor.authorBennett, Nigel Charles
dc.contributor.emailchoole@zoology.up.ac.zaen_ZA
dc.date.accessioned2017-01-13T07:56:59Z
dc.date.available2017-01-13T07:56:59Z
dc.date.issued2012-10
dc.description.abstractThe 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.departmentMammal Research Instituteen_ZA
dc.description.departmentZoology and Entomologyen_ZA
dc.description.librarianhb2016en_ZA
dc.description.sponsorshipThe DST-NRF for funding the South African Research Chair of Mammalian Behavioural Ecology and Physiology to NCB.en_ZA
dc.description.urihttp://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1469-7998en_ZA
dc.identifier.citationHoole, 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.issn0952-8369 (print)
dc.identifier.issn1469-7998 (online)
dc.identifier.other10.1111/j.1469-7998.2012.00928.
dc.identifier.urihttp://hdl.handle.net/2263/58510
dc.language.isoenen_ZA
dc.publisherWileyen_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.subjectCircadian rhythmsen_ZA
dc.subjectEntrainmenten_ZA
dc.subjectLighten_ZA
dc.subjectSouthern Africaen_ZA
dc.subjectSpiny mouse (Acomys spinosissimus)en_ZA
dc.titleThe locomotory activity rhythm of the spiny mouse, Acomys spinosissimus from southern Africa : light entrainment and endogenous circadian rhythmsen_ZA
dc.typePostprint Articleen_ZA

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