New PDF release: Advances in Insect Physiology, Vol. 11

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

ISBN-10: 0120242117

ISBN-13: 9780120242115

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Extra resources for Advances in Insect Physiology, Vol. 11

Example text

The lowest response was obtained from insects which had been allowed t o ingest sugar solution at the start o f the experimental period after having been deprived of both sugar and water for 24 h. The effects of feeding and deprivation on the responses of mosquitoes to the warm moist surface were much more marked. Insects which had previously been deprived of food and water for 24 h remained very responsive throughout a following 6-h test period. The responsiveness, after 1 h of the test period, was markedly lower in insects which had had access to sugar solution up to the beginning of the experiment, lower still in ones which had been allowed t o ingest water at the beginning of the experimental period after having been deprived of both sugar and water, and even lower in similarly deprived mosquitoes which had been given access t o sugar solution rather than water at the beginning of the experimental period.

These workers, working with larvae of L. mipatoria, found that the total. electrical resistance across the palps and the proportion of sensilla which would not respond electrophysiologically t o sodium chloride decreased sharply during the first 2 h of deprivation, but that those sensilla which did respond had normal sensitivity. They found, further, that the increase in resistance could be induced by causing distension of the fore-gut by the introduction of agar via the oesophagus through a cannula, but that there was an increase in resistance only if the crop was completely filled.

It seems that parabiosis experiments of the kind performed by Green (1964b) in his investigation into the effect of feeding on locomotor activity in P. 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.

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


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