Parasitoid wasp affects metabolism of cockroach host to favor food preservation for its offspring
Parasitoid wasp affects metabolism of cockroach host to favor food preservation for its offspring
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DOI：
10.1007/s00359-005-0620-1
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发表时间：
2005-06-01
影响因子：
2.1
通讯作者：
Libersat, F
中科院分区：
文献类型：
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作者：
Haspel, G;Gefen, E;Libersat, F
与捕食者不同，寄生蜂会立即吃掉猎物，使猎物无法为后代提供食物。本文研究了扁腹双足蜂毒液对蟑螂猎物代谢的影响。这种黄蜂刺入蟑螂的大脑，导致运动功能减退。我们首先确定幼虫的发育，从产卵到化蛹，持续约8天。在此期间，被蜇蟑螂的新陈代谢减慢，通过氧气消耗量的减少来衡量。类似的氧消耗量减少发生在脊髓诱发的麻痹或切断颈部连接从头神经节移除下行输入后。然而，这两组蟑螂都没有存活超过六天，而90%的被蜇蟑螂至少存活了这么长时间。此外，颈部连接被切断的蟑螂失去了更多的体重，主要是由于脱水。因此，A的刺痛。压缩蟑螂不仅使蟑螂猎物无助地顺从，而且还改变了它的新陈代谢，为发育中的幼虫提供更多营养。这种代谢操作比完全去除头神经节的下行输入要微妙得多，因为它保留了一些生理过程，如水潴留，完好无损。
Unlike predators, which immediately consume their prey, parasitoid wasps incapacitate their prey to provide a food supply for their offspring. We have examined the effects of the venom of the parasitoid wasp Ampulex compressa on the metabolism of its cockroach prey. This wasp stings into the brain of the cockroach causing hypokinesia. We first established that larval development, from egg laying to pupation, lasts about 8 days. During this period, the metabolism of the stung cockroach slows down, as measured by a decrease in oxygen consumption. Similar decreases in oxygen consumption occurred after pharmacologically induced paralysis or after removing descending input from the head ganglia by severing the neck connectives. However, neither of these two groups of cockroaches survived more than six days, while 90% of stung cockroaches survived at least this long. In addition, cockroaches with severed neck connectives lost significantly more body mass, mainly due to dehydration. Hence, the sting of A. compressa not only renders the cockroach prey helplessly submissive, but also changes its metabolism to sustain more nutrients for the developing larva. This metabolic manipulation is subtler than the complete removal of descending input from the head ganglia, since it leaves some physiological processes, such as water retention, intact.