Circadian Rhythms of Locomotor Activity in Triatoma Infestans (Hemiptera: Reduviidae)1

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Abstract
Locomotor activity of male Triatoma infestans was investigated under different photoperiods using rocking actographs. The insects showed a unimodal pattern of nocturnal activity that began with the onset of the dark phase. In constant light (LL) and constant temperature a mean period of locomotor activity of 28 h 6 min was estimated, while in constant darkness (DD) and constant temperature a mean period of activity was estimated at 24 h 50 min. Adaptation to a reversed DL regime occurred after 3 ± 0.8 cycles of activity. Well-fed individuals were less active than those that were unfed.

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