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首页> 外文期刊>Zoological Science >Predaceous Diving Beetle, Dytiscus sharpi sharpi (Coleoptera: Dytiscidae) Larvae Avoid Cannibalism by Recognizing Prey
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Predaceous Diving Beetle, Dytiscus sharpi sharpi (Coleoptera: Dytiscidae) Larvae Avoid Cannibalism by Recognizing Prey

机译：捕食前的甲壳虫，Dytiscus sharpi sharpi（Coleoptera：Dytiscidae）幼虫通过识别猎物避免食人

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Larvae of diving beetles such as the various Dytiscus species (Coleoptera: Dytiscidae) are carnivorous and usually prey on other aquatic animals. Cannibalism among larvae of Dytiscus sharpi sharpi (Wehncke) was observed to begin when they were starved for more than two days under artificial breeding conditions. However, the 2-day starved larvae did not show cannibalism in the presence of intact, motionless, frozen tadpoles, or frozen shrimps. The beetle larvae attacked and captured intact tadpoles faster (15 sec) than other motionless and frozen tadpoles (120 sec), indicating that prey movement was an important factor in stimulating feeding behavior in larvae. Prey density does not have an effect on larval cannibalism. In cases in which preys are present at lower densities than that of larvae, a group of beetle larvae frequently fed on single prey. This feeding behavior, therefore, provides direct evidence of self-other recognition at the species level. Using two traps in one aquarium that allows the larvae to detect only prey smell, one containing tadpoles and another empty, the beetle larvae were attracted to the trap with tadpoles at high frequency, but not to the empty trap. In another experiment, the beetle larvae were not attracted to the trap containing a beetle larva. These results suggest that the larvae of D. sharpi sharpi are capable of recognizing prey scent, which enables the promotion of foraging behavior and the prevention of cannibalism.
机译：潜水甲虫的幼虫，例如各种dytiscus种类（鞘翅目：dytiscidae）是肉食性的，通常会捕食其他水生动物。在人工繁殖条件下，当他们饿了两天以上时，就发现尖锐迪氏酵母（Wehncke）幼虫之间的同类相食开始。然而，在完整，一动不动，冷冻的，或冷冻虾存在的情况下，饥饿2天的幼虫没有表现出食人性。甲虫幼虫攻击和捕获完整t的速度（15秒）要比其他静止不动和冷冻的pole（120秒）要快，这表明猎物的运动是刺激幼虫觅食行为的重要因素。猎物密度对幼虫的同类相食没有影响。如果猎物的密度低于幼虫的密度，则一群甲虫幼虫经常以单个猎物为食。因此，这种进食行为在物种一级提供了自我-其他识别的直接证据。在一个水族馆中使用两个诱捕器，使幼虫只能检测猎物的气味，其中一个包含containing，而另一个则是空的，甲虫幼虫被with吸引到诱集器中的频率很高，但没有被吸引到空的诱集器中。在另一个实验中，甲虫幼虫没有被吸引到含有甲虫幼虫的诱捕器中。这些结果表明，D。sharpi sharpi的幼虫能够识别猎物的气味，从而能够促进觅食行为并防止同类相食。

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