Physiological rhythms are influenced by photophase wavelength in a nocturnal and a diurnal rodent species from South Africa

dc.contributor.authorVan der Merwe, Ingrid
dc.contributor.authorBennett, Nigel Charles
dc.contributor.authorHaim, Abraham
dc.contributor.authorGanswindt, Andre
dc.contributor.authorOosthuizen, Maria Kathleen
dc.contributor.emailmoosthuizen@zoology.up.ac.zaen_ZA
dc.date.accessioned2022-03-07T08:58:06Z
dc.date.issued2021-10
dc.descriptionAppendix 1. Experimental photophase light conditions that the animals were exposed to.en_ZA
dc.description.abstractThe quality and quantity of light changes significantly over the course of the day. The effect of light intensity on physiological and behavioural responses of animals has been well documented, particularly during the scotophase, but the effect of the wavelength of light, particularly during the photophase, less so. We assessed the daily responses in urine production, urinary 6-sulfatoxymelatonin (6-SMT) and glucocorticoid metabolite (uGCM) concentrations in the nocturnal Namaqua rock mouse (Micaelamys namaquensis) and diurnal four striped field mouse (Rhabdomys pumilio) under varying wavelengths of near monochromatic photophase (daytime) lighting. Animals were exposed to a short-wavelength light cycle (SWLC; ∼465–470 nm), a medium-wavelength light cycle (MWLC; ∼515–520 nm) and a long-wavelength light cycle (LWLC; ∼625–630 nm). The SWLC significantly attenuated mean daily urine production rates and the mean daily levels of urinary 6-SMT and of uGCM were inversely correlated with wavelength in both species. The presence of the SWLC greatly augmented overall daily 6-SMT levels, and simultaneously led to the highest uGCM concentrations in both species. In M. namaquensis, the urine production rate and urinary 6-SMT concentrations were significantly higher during the scotophase compared to the photophase under the SWLC and MWLC, whereas the uGCM concentrations were significantly higher during the scotophase under all WLCs. In R. pumilio, the urine production rate and uGCM were significantly higher during the scotophase of the SWLC, not the MWLC and LWLC. Our results illustrate that wavelength in the photophase plays a central role in the entrainment of rhythms in diurnal and nocturnal African rodent species.en_ZA
dc.description.departmentMammal Research Instituteen_ZA
dc.description.departmentZoology and Entomologyen_ZA
dc.description.embargo2022-08-12
dc.description.librarianhj2022en_ZA
dc.description.sponsorshipA DST-NRF SARChI Research Chair for Behavioural Ecology and Physiologyen_ZA
dc.description.urihttps://www.elsevier.com/locate/physbehen_ZA
dc.identifier.citationVan der Merwe, I., Bennett, N.C., Haim, A. et al. 2021, 'Physiological rhythms are influenced by photophase wavelength in a nocturnal and a diurnal rodent species from South Africa', Physiology and Behavior, vol. 240, art. 113551, pp. 1-9, doi : 10.1016/j.physbeh.2021.113551.en_ZA
dc.identifier.issn0031-9384 (print)
dc.identifier.issn1873-507X (online)
dc.identifier.other10.1016/j.physbeh.2021.113551
dc.identifier.urihttp://hdl.handle.net/2263/84360
dc.language.isoenen_ZA
dc.publisherElsevieren_ZA
dc.rights© 2021 Elsevier Inc. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Physiology and Behavior. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. A definitive version was subsequently published in Physiology and Behavior, vol. 240, art. 113551, pp. 1-9, 2021. doi : 10.1016/j.physbeh.2021.113551.en_ZA
dc.subjectDaily rhythmsen_ZA
dc.subjectPhotophase wavelengthen_ZA
dc.subjectUrine productionen_ZA
dc.subject6-sulfatoxymelatonin (6-SMT)en_ZA
dc.subjectUrinary glucocorticoid metabolite (uGCM)en_ZA
dc.subjectLong wavelength light cycle (LWLC)en_ZA
dc.subjectMedium wavelength light cycle (MWLC)en_ZA
dc.subjectShort wavelength light cycle (SWLC)en_ZA
dc.titlePhysiological rhythms are influenced by photophase wavelength in a nocturnal and a diurnal rodent species from South Africaen_ZA
dc.typePostprint Articleen_ZA

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