Spiracular Responses of Aedes Mosquitoes to Carbon Dioxide and Oxygen
FORT DETRICK FREDERICK MD
Pagination or Media Count:
Observations were made on the responses of the thoracic spiracles of Aedes aegypti and Aedes triseriatus to a constant carbon dioxide pressure in serial concentrations of oxygen in nitrogen and to the oxygen in nitrogen series alone. Lower than atmospheric pressures of oxygen caused an increase in the frequency and duration of spiracular opening. Higher than atmospheric pressures of oxygen had no effect on frequency of spiracular opening, but reduced the duration of opening. Carbon dioxide effected full spiracular opening in proportion to the oxygen concentration. The duration of spiracular opening, regardless of amplitude, was also proportional to the ratio of carbon dioxide to oxygen. Responses of Aedes spiracles to hypoxia and carbon dioxide decreased with increasing duration of exposure.