title: Respiratory gas exchange in the tick Amblyomma hebraeum (Acari: Ixodidae).
abstract: Respiratory gas exchange was studied in unfed adult Amblyomma hebraeum Koch. Carbon dioxide emission was measured at 25 degrees C using flow-through respirometry to determine standard metabolic rate and the temporal pattern of gaseous emission. The standard CO2 production rate (sVCO2) of inactive ticks was 0.0135 +/- 0.0085 ml g-1 h-1, and the standard O2 consumption rate (sVO2) was 0.0158 +/- 0.0097 ml g-1 h-1. Ventilation was discontinuous and was characterized by periodic bursts of CO2 emissions at frequencies of 0.33 h-1-1.11 h-1. Low metabolic rate coupled with discontinuous ventilation may contribute to the ability of adult A. hebraeum to withstand prolonged periods of starvation and desiccation in the absence of a host.
authors.affiliation: Department of Zoology, University of the Witwatersrand, Republic of South Africa.
authors.forename: L J
authors.initials: LJ
authors.lastname: Fielden
authors.forename: F D
authors.initials: FD
authors.lastname: Duncan
authors.forename: Y
authors.initials: Y
authors.lastname: Rechav
authors.forename: R M
authors.initials: RM
authors.lastname: Crewe
mesh_terms: D000818:Animals; D002245:Carbon Dioxide / Q000502:physiology; D012119:Respiration / Q000502:physiology; D013987:Ticks / Q000502:physiology*
chemical_list: D002245:Carbon Dioxide