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- W2965436514 abstract "Tuco-tucos from Anillaco (Ctenomys aff. knighti), are subterranean rodents that run vigorously on laboratory wheels during the night but are active during the day in semi-natural enclosures, where they surface for foraging and burrow maintenance, under intense sunlight. Several studies have shown that light causes opposite, inhibitory and stimulatory, masking effects on the activity levels between nocturnal and diurnal species, respectively. Because of the alternating subterranean/surface activity of tuco-tucos in nature during the day and their ability to shift from diurnal to nocturnal patterns in field-to-lab transitions, we assessed the acute effects of light and darkness on running wheel activity, general activity and body temperature. Adult males and females were kept in a LD 12:12 h regimen and exposed to light and dark pulses to verify masking effects in their rhythms. A first experiment consisted in submitting animals to light pulses of different illuminance during the dark phase. Clear inhibition of wheel-running activity occurred, being the response more pronounced as illuminance of the pulse increased, a response typically seen in nocturnal rodents. A second experiment consisted in submitting animals to light pulses during the dark phase, and later to dark pulses during the light phase. This protocol occurred three times in the conditions: 1) without a wheel, 2) with free access to a wheel, and 3) with a blocked wheel. Wheel running was inhibited and body temperature decreased in most animals during the light pulse, with little to no inhibition on general activity. Dark pulses during the light phase had no effect on wheel-running activity nor on general activity but did affect body temperature. Interestingly, there was a single individual that switched from nocturnal to diurnal when kept without a running wheel, offering an opportunity to test nocturnal and diurnal masking patterns to light in the same individual." @default.
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- W2965436514 date "2019-10-01" @default.
- W2965436514 modified "2023-10-11" @default.
- W2965436514 title "Acute effects of light and darkness on the activity and temperature rhythms of a subterranean rodent, the Anillaco tuco-tuco" @default.
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- W2965436514 doi "https://doi.org/10.1016/j.physbeh.2019.112645" @default.
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