The Effects Of Dietary Sodium And Potassium On Rapid Diuresis In The Tsetse Fly Glossina Morsitans

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A self-supporting colony of GlosslIw morsltalls can be maintained by feeding flies through artificial membranes but only if a diet of defibrInated pig blood is used. The potassium concentration of pig serum was found to be higher than that of cow or rabbit serum. However, this did not affect the rate of diuresis which was lower after 111 ritro diets than after feeding on a live host. After feeding ill vivo on rabbits, and III L'ltro on pig blood and cow blood, the concentrations of sodium and potassium in the haemolymph remained constant. After feeding on salt solutions and distilled water, on the other hand, It was found that the more the composition of the meal varied from that of blood serum the lower was the rate of diuresis and the more the concentrations of sodium and potassium in the haemolymph were displaced from their normal values. Large fluctuations in the concentrations of these ions resulted m the paralysis and death of the flies. The results demonstrate that the tsetse fly is able to reabsorb sodium from the primary urine produced by the Malpighian tubules during diuresis and it is suggested that this re-absorption of ions may lead to an increased circulation of water through the excretory system.
Parasitology, 23, p. 137-143