By J. E. Treherne, M. J. Berridge, V. B. Wigglesworth
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Extra resources for Advances in Insect Physiology, Vol. 11
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.
These conclusions should, however, be treated with some caution since, while it is apparent that the taste threshold and meal size are normally well correlated, it seems unlikely, on the basis of what is known about the physiological regulation of meal size in P. 4), that threshold directly determines meal size, or even that both are under the control of the same physiological mechanisms. 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.
In L. cuprina, therefore, in contrast t o the situation in P. regina, the composition of the haemolymph seems to be more important in controlling water responsiveness than is its volume. So far, in the discussion of tarsal thresholds, only the responsiveness of insects t o substances which stimulate them to proceed t o the next phase of their feeding behaviour have been considered. The question arises as t o whether insects might not become less sensitive t o materials which deter them from doing so, as the period of deprivation increases.
Advances in Insect Physiology, Vol. 11 by J. E. Treherne, M. J. Berridge, V. B. Wigglesworth