High lability of global niche and range in the Giant African Snail (Lissachatina fulica): Small niche expansions resulting in large range shifts
High lability of global niche and range in the Giant African Snail (Lissachatina fulica): Small niche expansions resulting in large range shifts
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DOI：
10.1016/j.ecolind.2023.110328
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发表时间：
2023-07
影响因子：
6.9
通讯作者：
Chunhong Wu;Shun Li;Yefu Zhou;Xiaokang Hu;Jianmeng Feng
中科院分区：
文献类型：
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作者：
Chunhong Wu;Shun Li;Yefu Zhou;Xiaokang Hu;Jianmeng Feng
作为全球变化的主要根源，生物入侵在过去几十年中受到越来越多的关注。外来入侵物种的生态位和范围动态为理解生物入侵的机制提供了重要的证据。然而，据我们所知，有关软体动物的相关研究报道很少。在这里，我们从气候适宜性的角度，研究了世界上最具入侵性的软体动物之一非洲巨型蜗牛（Lissachatina fulica）的生态位和范围变化。我们观察到，与本土蜗牛相比，这种入侵性蜗牛可以在温度范围更广的环境中生存。入侵蜗牛比本地同类表现出更宽的生态位宽度和更大的潜在范围，并占据不同的生态位和范围位置，表明其在生态位和范围方面具有较高的不稳定性。这种入侵性的非洲巨蜗牛不符合生态位和范围保守主义假设，可能是由于人类引入和生态位释放的影响。鉴于范围大小的大幅变化可能是由小规模的生态位扩张引起的，因此生态位变化比范围变化成为生物入侵评估更重要的指标。虽然大多数入侵物种在生态位空间中表现出较低的不稳定性，但在非洲巨型蜗牛中观察到高度不稳定的生态位，这表明应优先考虑防止这种入侵软体动物生物入侵的策略。我们的研究在一定程度上可以进一步了解入侵软体动物与其本地同类之间的生态位变化和范围动态。
As a major source of global change, biological invasions have received increasing attention in past decades. Niche and range dynamics of alien invasive species provide essential evidence for understanding mechanisms underlying biological invasions. However, to our knowledge few relevant studies on mollusks have been reported. Here, from the perspective of climatic suitability, we investigated niche and range shifts of the Giant African Snail (Lissachatina fulica), one of the world’s most invasive mollusks. We observed that, compared with its native counterpart, this invasive snail could survive in environments with wider temperature ranges. The invasive snail showed a wider niche breadth and larger potential range than its native counterpart, and occupied different niche and range positions, indicating its high lability in terms of niche and range. This invasive Giant African Snail did not conform to the niche and range conservatism hypotheses, probably due to the influence of human introductions and niche releasing. Given that large shifts in range size can result from small niche expansions, making niche shifts a more important indicator for biological invasion assessments than range shifts. While most invasive species show low lability in niche space, highly labile niche was observed in the Giant African Snail, indicating that strategies to prevent biological invasions by this invasive mollusk should be prioritized. Our study, to certain extent, could further our understanding on the niche shifts and range dynamics between the invasive mollusks and their native counterparts.