Advances in Insect Physiology, Vol. 11 by J. E. Treherne, M. J. Berridge, V. B. Wigglesworth

By J. E. Treherne, M. J. Berridge, V. B. Wigglesworth

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The relationship between threshold and the glycogen content of the fly was examined by Hudson (1958) who demonstrated that glycogen was still increasing at a time when threshold had fallen substantially. By a similar argment t o that used above regarding haemolymph sugar concentration, it seems likely that the glycogen content of the fly is not a controlling factor for sugar threshold. The finding by Evans and Dethier (1957), that feeding on the non-nutritional sugars lactose and fucose caused prolonged threshold elevation generally similar t o those obtained when flies were fed on the nutritional sugars glucose and mannose, indicates that the threshold 30 L.

She showed also that the responsiveness of chemoreceptors increased with increasing period of deprivation in flies which previously had prolonged access t o sugar and that access t o D-arabinose, a sugar which is nonnutritive for P. regina, caused at least as great a reduction as did access t o sucrose, glucose or fructose. In all her experiments, Omand deprived the flies of sucrose for several hours before testing and was therefore able t o eliminate the possibility that the effect was due to adaptation of the receptors.

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.

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