Observations on Spiracular Behavior in Aedes Mosquitoes1

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Abstract
An apparatus was constructed to allow simultaneous observation of the thoracic spiracles of adult female mosquitoes and to permit recording of the behavior observed. A microenvironment of controlled composition and relative humidity was provided. In Aedes (Diptera: Culicidae) at rest in air the thoracic spiracles constantly open and close synchronously. The degree of such opening is minimal. Stationary flight, CO2, or hypoxia cause much more extensive synchronized opening. It was suggested that the thoracic compressions and extensions of the head noted in flight or hypoxia are possible ventilatory mechanisms, and were unrelated to the frequency of spiracular opening and closing. Decapitation eliminated spontaneous locomotor activity and resulted in more conservative spiracular behavior.

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