Read e-book online Advances in Insect Physiology, Vol. 11 PDF

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

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Mosquitoes given onIy a blood meal were initially unresponsive to both targets, but became progressively more responsive during the following 24 h, the response throughout the whole period of deprivation being somewhat greater to the palm of the hand than t o the artificial target. On the basis of these results, Khan and Maibach (1971) suggest that the feedback controlling the responsiveness of mosquitoes t o stimuli emanating from the skin is not controlled by the volume of material in the diverticulum or by distension of the abdominal wall, because probing occurs even when the diverticulum is full of sugar solution.

Like Minnich, he made his earliest determination after the flies had been deprived for 24 h. He found that, during the following 9 days, the labellar threshold t o sucrose fell somewhat more slowly than the tarsal threshold, but that this relationship was not true for thresholds t o all sugars tested. For some sugars, in fact, he found that the labellar threshold fell somewhat more rapidly than the tarsal threshold. The effects of deprivation on labellar thresholds t o sugars have been studied also in P.

In experiments designed t o elucidate the mechanisms involved, Manjra showed that threshold did not rise after sugar feeding if the ingested material was immediately withdrawn from the diverticulum with a hypodermic needle. The findings are consistent with the view that distension of the abdomen is important in bringing about elevation of labellar thresliolds but there is a possibility that the situation might be more complex, with different mechanisms operating after sugar and blood meals. Blaney and Chapman (1970), as part of an investigation into the role of the maxillary palps in the feeding behaviour of late instar larvae of Locusta migratoria, showed that, as the post-feeding period of deprivation increased from less than 1 h t o between 2 and 3 h, the proportion of insects which palpated upon the normally rejected plant Bellis perennzs, but which did not proceed t o the next stage in the feeding sequence, biting, fell from about 6 8 t o 1 0 per cent.

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