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Survival of an invasive aquatic snail to overland translocation in non-aquatic media: Implications for spreading

机译：侵入性水生蜗牛在非水生媒介中向陆上易位的生存：对传播的影响

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摘要

Invasive species are a threat to aquatic ecosystems worldwide. Aquatic snails have a limited ability for an active dispersal. Therefore, their ability to survive to transport in non-aquatic media may help explain their spread across unconnected habitats. We assessed the ability of New Zealand Mud Snail (NZMS) (Potamopyrgus antipodarum) to survive attached to different materials. Two studies were conducted: (1) a laboratory study to assess the tolerance of a laboratory population of NZMS to non-aquatic media attaching snails to leaf litter, sediment and clay and (2) a field-laboratory study to assess the survival of an invasive field population after being left imbedded in clay in the laboratory and subsequently transferred to a new river reach. All laboratory animals died after 3 days in leaf litter, while in the case of sediment and clay all snails died after 5 days. After being imbedded in clay and subsequently transferred to the river, the survival of the field population was lower than that of the laboratory populations. We conclude that NZMS can be dispersed by mechanisms which imply spending some time in non-aquatic media, and that this species has a relatively high tolerance to translocation between reaches with contrasting environmental properties. (C) 2016 Elsevier GmbH. All rights reserved.
机译：入侵物种对全世界的水生生态系统构成威胁。水生蜗牛的主动扩散能力有限。因此，它们在非水介质中存活的生存能力可能有助于解释它们在未连通的生境中的传播。我们评估了新西兰泥蜗牛（NZMS）（Potamopyrgus antipodarum）附着在不同材料上的生存能力。进行了两项研究：（1）一项实验室研究，以评估NZMS实验室种群对将蜗牛附着在枯枝落叶，沉积物和黏土上的非水介质的耐受性;以及（2）一项现场实验室研究，以评估纽带的存活。入侵野外种群被留在实验室的粘土中，随后转移到新的河段。所有实验动物在叶片垫料中放置3天后死亡，而在沉积物和粘土中，所有蜗牛在5天后死亡。埋在粘土中，然后转移到河中后，野外种群的存活率低于实验室种群。我们得出的结论是，NZMS可以通过暗示在非水生介质中花费一些时间的机制来分散，并且该物种对具有不同环境特性的河段之间的转运具有较高的耐受性。 （C）2016 Elsevier GmbH。版权所有。

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