By J. E. Treherne, M. J. Berridge, V. B. Wigglesworth
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Additional info for Advances in Insect Physiology, Vol. 11
Haslinger (1935) using Culliphora erythrocephnla (= C. vicina) attempted t o overcome this problem by presenting a series of concentrations of deterrent made up in concentrations of fructose which were 3 times those known t o be threshold concentrations for flies in each of the test states of deprivation. His results with hydrochloric acid as the deterrent substance show that the flies did not, in fact, become less sensitive t o it, the concentration of acid required t o obtain rejection REGULATORY MECHANISMS I N INSECT FEEDING 35 remaining essentially constant throughout prolonged deprivation.
It is difficult to draw any useful conclusion from the conflicting results that have been obtained concerning the effects of feeding znd deprivation on the labellar thresholds of blowflies, other than that the whole question needs detailed re-examination. It may well be that there are real differences between the species used, but this explanation cannot be invoked to reconcile the results of Arab (1957) with those of Getting and Steinhardt (1972). It seems possible that differences in the method of application of the stimulus t o the labellum might have been responsible for some of the differences between the results.
In addition, they indicate that any effect of this kind cannot be a dominant cause o f threshold elevation for any more than 4-6 h in inactive flies. Also relevant t o the assessment of the possible role of d:irect events during feeding is the statement by Dethier and Bodenstein (1958) that flies which had undergone recurrent nerve section failed t o show the normal post-feeding rise in tarsal threshold. If this is so, it would follow that direct effects of events during ingestion play no significant role in bringing about the post-feeding elevation in threshold.
Advances in Insect Physiology, Vol. 11 by J. E. Treherne, M. J. Berridge, V. B. Wigglesworth