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A taste for exotic food: Neotropical land planarians feeding on an invasive flatworm

机译：一种异国美食的味道：以侵入性扁虫为食的新热带陆地涡虫

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Invasive species establish successfully in new habitats especially due to their ability to include new species in their diet and due to the freedom from natural enemies. However, native species may also adapt to the use of new elements in their ecosystem. The planarian Endeavouria septemlineata, first recorded in Hawaii, was later found in Brazil. Recently, we found it in human-disturbed areas in southern Brazil and here we investigate its interactions with other invertebrates both in the field and in the laboratory. We observed the species in the field during collecting activities and hence maintained some specimens alive in small terraria in the laboratory, where we offered different invertebrate species as potential prey and also put them in contact with native land planarians in order to examine their interaction. Both in the field and in the laboratory, E. septemlineata showed a gregarious behavior and was found feeding on woodlice, millipedes, earwigs and gastropods. In the laboratory, specimens often did not attack live prey, but immediately approached dead specimens, indicating a scavenging behavior. In an experiment using the slug Deroceras laeve and the woodlouse Atlantoscia floridana, there was a higher consumption of dead specimens of woodlice and slugs compared to live specimens, as well as a higher consumption of dead woodlice over dead slugs. Four native land planarians of the genus Obama and one of the genus Paraba attacked and consumed E. septemlineata, which, after the beginning of the attack, tried to escape by tumbling or using autotomy. As a scavenger, E. septemlineata would have no impact on the populations of species used as food, but could possibly exclude native scavengers by competition. On the other hand, its consumption by native land planarians may control its spread and thus reduce its impact on the ecosystem.
机译：入侵物种已在新的栖息地中成功建立，特别是因为它们能够在饮食中包含新物种，并且不受天敌的攻击。但是，本地物种也可能适应其生态系统中新元素的使用。最早在夏威夷记录到的涡虫Endeavouria septemlineata，后来在巴西被发现。最近，我们在巴西南部受人类干扰的地区发现了它，在这里我们研究了它与野外和实验室中其他无脊椎动物的相互作用。我们在收集活动期间在野外观察了该物种，因此在实验室中将一些标本保存在较小的地盘中，在这里我们提供了不同的无脊椎动物作为潜在的猎物，并且使它们与本土的陆平面刨光机接触以检查它们的相互作用。在野外和实验室，E。septemlineata均表现出群居行为，并以木虱，千足虫，ear和腹足动物为食。在实验室中，标本通常不攻击活的猎物，而是立即接近死去的标本，表明有清除行为。在使用条形龙（Deroceras laeve）和木虱Atlantoscia floridana的实验中，木虱和的死标本比活标本的消耗量更高，死木虱比死dead的消耗量更高。奥巴马属的四位土著土平面工人和帕拉巴属的其中一名土著人袭击并食用了七叶E，在袭击开始后，他们试图通过翻滚或切开尸体逃脱。作为一种清道夫，E。septemlineata对用作食物的物种的种群没有影响，但是可能通过竞争排除本地清道夫。另一方面，本土平面虫对它的消费可以控制其传播，从而减少其对生态系统的影响。

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