By J. E. Treherne, M. J. Berridge, V. B. Wigglesworth
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Extra info for Advances in Insect Physiology, Vol. 11
Regina might usefully be repeated, this time t o determine whether the feeding of one fly influences the tarsal threshold of its parabiotic partner. The possibility that perseverating effects generated in the CNS by inputs from internal sources might play a role in the regulation of tarsal threshold has not been directly investigated in P. regina. , 1965, 1968) in parts o f the nervous system of P. regina concerned with feeding behaviour; and this suggests the possibility that input from internal sources might also be capable of producing effects of this kind.
The possibility that threshold elevation might be brought about by the presence of sugar solution in some part of, the gut other than the crop has been investigated in a number of ways. 0 M sucrose. They found that the threshold of both groups of ligated flies remained high for about 3 h and concluded that the presence of sugar in the mid-gut is not necessary for the REGULATORY MECHANISMS IN INSECT FEEDING 27 maintenance of an elevated threshold. 0 M glucose. They found that there was no elevation of threshold even though the glucose solution, which had been introduced via the anus, filled the gut from the rectum forward t o the proventriculus.
Regina to sugars was investigated by Evans and Dethier (1957) and Hudson (1958). Evans and Dethier (1957), REGULATORY MECHANISMS I N INSECT FEEDING 29 using flies restrained on waxed sticks, compared the time courses of changes in taste threshold and in the concentration in the haemolymph of trehalose, which is the main blood sugar of adult P. repinu, and of the sugar on which the flies had fed. They demonstrated that there was no predictable relationship between threshold and the concentration of either sugar.
Advances in Insect Physiology, Vol. 11 by J. E. Treherne, M. J. Berridge, V. B. Wigglesworth