By J. E. Treherne, M. J. Berridge, V. B. Wigglesworth
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Extra info for Advances in Insect Physiology, Vol. 11
There have been a number of direct investigations into the possibility that changes with feeding and deprivation other than those occurring in the gut might also play a part in the regulation of threshold. The possibility that the concentration of sugar in the haemolymph might play a role in determining the tarsal thresholds of P. 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.
The second response, which also has been 22 L. BARTON BROWNE demonstrated in blowflies (Dethier, 1961; Pflumm, 1970), but which is also certainly shown by other insects, is for the insect t o stop walking, presumably when the two fore-tarsi are receiving approximately equal stimulation. The third response is for the insect t o extend or otherwise move the mouthparts so as t o bring them in contact with the food. This latter act will either allow the insect t o begin ingesting the food immediately or, probably more commonly, will bring into contact with the food the chemoreceptors situated on the mouthparts, which are involved in eliciting the next phase of behaviour leading towards ingestion.
It is possible therefore that procedures such as the injection of material into the haemocoel might cause the two measures of responsiveness t o sugars t o become less well correlated than under normal circumstances. It can fairly be stated, however, that Gelperin’s results, like those relating to the effect of recurrent nerve section, provide evidence that factors other than effects of events during feeding play a role in the general regulation of subsequent feeding behaviour, even it it is somewhat uncertain as t o whether the results should be interpreted as relating strictly t o the regulation of tarsal threshold.