Abstract Pomacea canaliculata is a successful invader and also a competitor and predator of other snails and may play a key role in structuring freshwater snail communities both in its native and invaded range. In the present study we evaluated the contact and distant effects of P. canaliculata in its native range on exotic (Melanoides tuberculata and Physa acuta) and native snails (Heleobia parchappii, Biomphalaria peregrina, and Chilina parchappii). Habitat use was affected in P. acuta, H. parchappii, and B. peregrina by contact effects of P. canaliculata, whereas survival was only affected in P. acuta through combined contact and distant effects. Fecundity was reduced in P. acuta and B. peregrina by combined contact and distant effects; evidence of egg mass predation was also observed in both species. Melanoides tuberculata was not affected at all by P. canaliculata. The snail species with higher withdrawal responses to contacts with P. canaliculata were those that suffered less mortality by corporal contact, whereas snails with high crawling away responses suffered from higher mortality. The effects of P. canaliculata seem to be highly negative to small nonoperculate snails that lay gelatinous egg masses, whereas large operculate ovoviviparous snails are not affected in their survival and reproduction. This apple snail may exert biotic resistance against P. acuta but could favor the establishment of M. tuberculata and other functionally similar species in new habitats in South America.

中文翻译：

---

与超级成功的邻居打交道：入侵的苹果蜗牛 Pomacea canaliculata 对南美洲外来和本地蜗牛的影响

摘要 Pomacea canaliculata 是一种成功的入侵者，也是其他蜗牛的竞争者和捕食者，可能在其原生和入侵范围内构建淡水蜗牛群落中发挥关键作用。在本研究中，我们评估了 P. canaliculata 在其原生范围内对外来（Melanoides tuberculata 和 Physa acuta）和本地蜗牛（Heleobia parchappii、Biomphalaria peregrina 和 Chilina parchappii）的接触和远距离影响。P. acuta、H. parchappii 和 B. peregrina 的栖息地利用受到 P. canaliculata 的接触效应的影响，而 P. acuta 的生存仅通过接触和远距离的综合影响受到影响。P. acuta 和 B. peregrina 的繁殖力因接触和远距离的共同作用而降低；在这两个物种中也观察到了卵群捕食的证据。Melanoides tuberculata 完全不受 P. canaliculata 影响。与 P. canaliculata 接触具有较高戒断反应的蜗牛物种因身体接触而死亡率较低，而具有高爬行反应的蜗牛死亡率较高。P. canaliculata 的影响似乎对产下凝胶状卵块的小型无毛蜗牛非常不利，而大型有毛卵胎生蜗牛的生存和繁殖不受影响。这种苹果蜗牛可能对 P. acuta 产生生物抗性，但可能有利于在南美洲的新栖息地建立 M.tuberculata 和其他功能相似的物种。canaliculata 是那些因身体接触而死亡率较低的蜗牛，而具有高爬行反应的蜗牛死亡率较高。P. canaliculata 的影响似乎对产下凝胶状卵块的小型无毛蜗牛非常不利，而大型有毛卵胎生蜗牛的生存和繁殖不受影响。这种苹果蜗牛可能对 P. acuta 产生生物抗性，但可能有利于在南美洲的新栖息地建立 M.tuberculata 和其他功能相似的物种。canaliculata 是那些因身体接触而死亡率较低的蜗牛，而具有高爬行反应的蜗牛死亡率较高。P. canaliculata 的影响似乎对产下凝胶状卵块的小型无毛蜗牛非常不利，而大型有毛卵胎生蜗牛的生存和繁殖不受影响。这种苹果蜗牛可能对 P. acuta 产生生物抗性，但可能有利于在南美洲的新栖息地建立 M.tuberculata 和其他功能相似的物种。而大型有盖卵胎生蜗牛的生存和繁殖不受影响。这种苹果蜗牛可能对 P. acuta 产生生物抗性，但可能有利于在南美洲的新栖息地建立 M.tuberculata 和其他功能相似的物种。而大型有盖卵胎生蜗牛的生存和繁殖不受影响。这种苹果蜗牛可能对 P. acuta 产生生物抗性，但可能有利于在南美洲的新栖息地建立 M.tuberculata 和其他功能相似的物种。