Abstract
Aggregation of Trialoma infestans nymphs was independent of temperature. Bugs showed no tendency to aggregate when maintained at constant temperatures between 19–40 °C. However, when placed in a temperature gradient from about 17–36 °C, both fed and unfed bugs showed a marked preference for temperatures of 26–27 °C. Bugs without antennae showed no significant reduction in activity in a rocking actograph on the days following antennal removal, but they were unable to orientate along the temperature gradient and showed no apparent thermal preference. It was therefore concluded that both fed and unfed bugs show a preference for environmental temperatures of 26–27 °C; they perceive this temperature with the antennae and move actively towards environments at this temperature. This environmental temperature preference is distinct from host-seeking behavior.
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