As global climates change, alien species are anticipated to have a growing advantage relative to their indigenous counterparts, mediated through consistent trait differences between the groups. These insights have largely been developed based on interspecific comparisons using multiple species examined from different locations. Whether such consistent physiological trait differences are present within assemblages is not well understood, especially for animals. Yet, it is at the assemblage level that interactions play out. Here, we examine whether physiological trait differences observed at the interspecific level are also applicable to assemblages. We focus on the Collembola, an important component of the soil fauna characterized by invasions globally, and five traits related to fitness: critical thermal maximum, minimum and range, desiccation resistance and egg development rate. We test the predictions that the alien component of a local assemblage has greater basal physiological tolerances or higher rates, and more pronounced phenotypic plasticity than the indigenous component. Basal critical thermal maximum, thermal tolerance range, desiccation resistance, optimum temperature for egg development, the rate of development at that optimum and the upper temperature limiting egg hatching success are all significantly higher, on average, for the alien than the indigenous components of the assemblage. Outcomes for critical thermal minimum are variable. No significant differences in phenotypic plasticity exist between the alien and indigenous components of the assemblage. These results are consistent with previous interspecific studies investigating basal thermal tolerance limits and development rates and their phenotypic plasticity, in arthropods, but are inconsistent with results from previous work on desiccation resistance. Thus, for the Collembola, the anticipated advantage of alien over indigenous species under warming and drying is likely to be manifest in local assemblages, globally.

中文翻译：

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基础耐受性而非可塑性使侵入性弹尾虫在组合环境中具有优势。


随着全球气候的变化，外来物种相对于本土物种预计将拥有越来越大的优势，这是通过群体之间一致的性状差异来调节的。这些见解很大程度上是基于使用从不同地点检查的多个物种进行的种间比较而得出的。这种一致的生理特征差异是否存在于组合中尚不清楚，特别是对于动物而言。然而，交互作用是在组合层面上发挥作用的。在这里，我们检查在种间水平观察到的生理特征差异是否也适用于组合。我们重点关注跳虫，它是全球范围内遭受入侵的土壤动物群的重要组成部分，以及与适应性相关的五个特征：临界热最大值、最小值和范围、抗干燥性和卵发育率。我们测试了以下预测：本地组合的外来成分比本土成分具有更大的基础生理耐受性或更高的比率，以及更明显的表型可塑性。平均而言，外来物种的基础临界热最大值、耐热范围、抗干燥性、蛋发育的最适温度、最佳发育速率和限制蛋孵化成功率的上限温度都显着高于本土成分。装配。临界热最小值的结果是可变的。该组合的外来成分和本地成分之间的表型可塑性不存在显着差异。 这些结果与之前研究节肢动物基础耐热极限、发育速率及其表型可塑性的种间研究一致，但与之前关于抗干燥性的研究结果不一致。因此，对于跳虫来说，在变暖和干燥的情况下，外来物种相对于本地物种的预期优势可能会在全球范围内的本地组合中显现出来。