Abstract
The aim of this work was to describe the pineal, serum and retinal melatonin daily rhythms in viscacha (Lagostomus maximus maximus), a nocturnal and subterranean rodent. A daily rhythm with a nocturnal peak and an increase during the light phase was found in all cases, with the seric rhythm being delayed with respect to the pineal one. Chronic lithium administration to viscachas suppressed the diurnal increase of pineal melatonin, abolished the retinal rhythm and had no effect on seric melatonin.
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