Changes in multiple environmental factors additively enhance the dominance of an exotic plant with a novel trade-off pattern
Changes in multiple environmental factors additively enhance the dominance of an exotic plant with a novel trade-off pattern
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多种环境因素的变化通过新颖的权衡模式进一步增强了外来植物的主导地位
DOI：
10.1111/1365-2745.13386
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发表时间：
2020
影响因子：
5.5
通讯作者：
Li B
中科院分区：
文献类型：
--
作者：
Qiu SY;Liu SS;Wei SJ;Cui XH;Nie M;Huang JX;He Q;Ju RT;Li B
全球变化对本地和外来物种的影响是否不同尚不清楚，因为这些变化可能有利于本地和外来物种而不是竞争对手。以往的研究主要集中在不同环境变化的单独影响上，但植物群落受到多种环境因子变化的影响，目前还不清楚本地物种和外来物种是否对这些因素的综合影响做出类似的反应。我们假设，当物种被同时受到多种环境变化。使用沿海盐沼植物群落作为研究系统，我们实验操纵洪水和养分富集，研究了两个本地物种和一个外来物种的竞争力和胁迫耐受力之间的种间权衡，并探讨了这两种环境变化对原住民和原住民的综合影响，外来物种的相互作用。我们发现，洪水和营养富集相反地影响本地本地物种的相互作用，但添加剂影响本地外来物种的相互作用。这两个因素共同导致两个本地物种之间的相对优势没有净变化，但增强了外来物种对本地物种的优势。这种差异的发生是因为外来物种不受种间竞争力和胁迫耐受性之间的权衡，限制了本地物种。综合我们的研究结果表明，多种环境因素的变化有利于外来物种，因为进化的新权衡模式。在未来试图预测全球变化对生物入侵的影响时，需要考虑入侵群落中物种共存的机制，如种间权衡。
Whether global changes impact native and exotic species differently is unclear, because the changes may favour both native and exotic species over competitors. Previous studies have mainly focused on the separate effects of different environmental changes, but plant communities are influenced by the changes in multiple environmental factors, and it is still unclear whether native and exotic species respond similar to the combined effects of these factors.We hypothesized that differences in interspecific trade‐offs between native and exotic species can lead to the dominance of exotic species when the species are simultaneously subjected to multiple environmental changes.Using coastal saltmarsh plant communities as the study system, we experimentally manipulated flooding and nutrient enrichment, examined the interspecific trade‐offs between competitiveness and stress tolerance for two native and one exotic species, and explored the combined effect of the two environmental changes on both native–native and native–exotic species interactions.We found that flooding and nutrient enrichment oppositely affected native–native species interactions but additively affected native–exotic species interactions. The two factors together resulted in no net change in the relative advantages between the two native species but enhanced the dominance of the exotic species over the native species. This disparity occurred because the exotic species was not subject to the interspecific trade‐off between competitiveness and stress tolerance that constrained the native species.Synthesis.Our results suggest that changes in multiple environmental factors favour exotic species because of evolutionary novel trade‐off patterns. Mechanisms underlying species coexistence in the invaded community such as interspecific trade‐offs need to be considered when future attempts are made to predict the effects of global changes on biological invasions.