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Journal of Experimental Biology 98,343-352 (1982)
Published by Company of Biologists 1982

Mechanism and Characteristics of Coxal Fluid Excretion in The Argasid Tick Ornithodorus Moubata

SUSAN E. KAUFMAN 1, WILLIAM R. KAUFMAN 2, and JOHN E. PHILLIPS 3

1 Department of Zoology, University of British Columbia, Vancouver, British Columbia, V6T IW5, Canada; Division of Cardiology, Department of Medicine, University of Alberta, Edmonton, Alberta, T6G 2G3, Canada
2 Department of Zoology, University of British Columbia, Vancouver, British Columbia, V6T IW5, Canada; Department of Zoology, University of Alberta, Edmonton, Alberta, T6G 2E9, Canada
3 Department of Zoology, University of British Columbia Vancouver, British Columbia, V6T 1W5, Canada

1. Adult ticks (Ornithodorus moubata Murray, Acari, Argasidae) were fed on human blood at 37 °C in a beaker covered with chicken skin.

2. 14C-labelled inulin and 3-o-[14CH3]glucose were rapidly cleared from haemolymph to coxal fluid; the coxal tubule appeared not to reabsorb either substance. Glucose was reabsorbed from tubular fluid via a phlorrhizin-sensitive mechanism. Reabsorption of amino acids varied between 0 and 90% but was greatest for those amino acids which were scarce in the meal.

3. During normal feeding conditions, there was positive correlation between haemocoelic hydrostatic pressure and rate of coxal fluid excretion.

4. Unilateral cannulation of a coxal organ so as to eliminate back pressure of a valve at the coxal orifice led to a twofold increase in rate of coxal fluid production compared to the contralateral side.

5. The above data confirm that coxal fluid excretion occurs by a filtration-resorption mechanism.

Submitted on September 7, 1981






© The Company of Biologists Ltd 1982