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Does Global Warming Induce Segregation Among Alien And Native Beetle Species In A Mountain-top?

机译：全球变暖是否会导致山顶上的外来和本地甲虫物种隔离？

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摘要

The last few centuries have seen an increase in the mean air temperature of the planet, a phenomenon that is called "global warming". One of the most sensitive habitats to the effects of global warming is the high-elevation mountain environments, because these habitats are characterized by low temperature. Cushion plants are one of the best-adapted growth forms in this habitat, generating more suitable sites for other plants and insects. In the present study, we experimentally evaluated the effects of global warming by open-top chambers on the abundance and interaction of two ladybirds at 3,600 m, growing over cushions of the Azorella monantha species in the Andes of central Chile. Additionally, we measured variation in temperature, water content, and food availability by the presence of open-top chambers as possible mechanisms of spatial segregation between ladybirds. Without open-top chambers, the abundance of native and alien beetles was similar; but with open-top chambers, the native beetle species is spatially segregated by alien species, decreasing in abundance. The open-top chambers increase temperature and food availability, but not water content. We suggest that under the global warming scenario, the native insects will decrease in abundance or become extinct by the presence of alien insects, at least in the high-elevation mountain environments.
机译：在过去的几个世纪中，行星的平均气温升高，这种现象被称为“全球变暖”。对于全球变暖影响最敏感的栖息地之一是高海拔山区环境，因为这些栖息地的特点是温度低。垫层植物是该生境中最适合生长的形式之一，为其他植物和昆虫提供了更合适的场所。在本研究中，我们通过实验评估了开放式室对全球3,600 m上生长在智利中部安第斯山脉的Azorella monantha物种垫层上的两只瓢虫的丰度和相互作用的影响。另外，我们测量了温度，水含量和食物供应量的变化，这些变化是通过开顶室作为瓢虫之间空间隔离的可能机制来实现的。没有开顶室，原生和外来的甲虫的丰度是相似的。但是，在开放式室的情况下，本地甲虫物种在空间上被外来物种隔离，数量减少。开放式室增加温度和食物供应，但不增加水含量。我们建议，在全球变暖的情况下，至少在高海拔山区环境中，由于外来昆虫的存在，本地昆虫的数量会减少或灭绝。

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