![]() This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are creditedĭata Availability: All relevant data are within the paper and its Supporting Information files.įunding: This work was supported by the Fundação de Amparo à Pesquisa do Estado de São Paulo ( grants 12/15767-2, 12/16362-6, 13/50482-1 to GAO 12/23393-5 to PT, Conselho Nacional de Desenvolvimento Científico e Tecnológico ( grant 142215/2012-0 to PT, Consejo Nacional de Investigaciones Científicas y Técnicas ( grant PIP-11420090100252 to VSV and the Agencia Nacional de Promoción Científica y Tecnológica ( grant PICT 2011-1979 to VSV. ![]() Received: JAccepted: SeptemPublished: October 13, 2015Ĭopyright: © 2015 Tachinardi et al. Mintz, Kent State University, UNITED STATES This is the first report of timing switches that occur with spontaneous wheel-running suppression and which are not replicated by removal of the wheel.Ĭitation: Tachinardi P, Tøien Ø, Valentinuzzi VS, Buck CL, Oda GA (2015) Nocturnal to Diurnal Switches with Spontaneous Suppression of Wheel-Running Behavior in a Subterranean Rodent. Surprisingly, some individuals spontaneously suppressed running-wheel activity and switched to diurnality in the respirometry chamber, whereas the remaining animals continued to be nocturnal even after wheel removal. We assessed their energy metabolism by continuously and simultaneously monitoring rates of oxygen consumption, body temperature, general motor and wheel running activity for several days in the presence and absence of wheels. knighti) are subterranean rodents that are diurnal in the field but are robustly nocturnal in laboratory, with or without access to running wheels. This proposition is based on studies that indicate feed-back of vigorous wheel-running on the period and phase of circadian clocks that time daily activity rhythms. It has been suggested that the use of running-wheels in the lab might contribute to this timing switch. Several rodent species that are diurnal in the field become nocturnal in the lab.
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