Environmental conditions and community evenness determine the outcome of biological invasion
Environmental conditions and community evenness determine the outcome of biological invasion
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DOI：
10.1038/ncomms2392
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发表时间：
2013-01-01
影响因子：
16.6
通讯作者：
Boon, Nico
中科院分区：
文献类型：
--
作者：
De Roy, Karen;Marzorati, Massimo;Boon, Nico
生物入侵被广泛研究，然而，关于这一过程结果的结论主要来源于对大量实验变量不受控制的系统的观察。在这里，我们使用由组装的细菌群落组成的完全受控系统，评估入侵程度以及与特定环境压力下初始群落均匀度相关的群落功能的影响。我们表明，均匀度会影响入侵水平，并且引入的物种可以在压力下促进功能。在不存在应力的情况下，均匀度-侵入性关系为负值，在存在应力的情况下为中性关系。在这些条件下，引入的物种能够维持不均匀群落的功能。这些结果表明，最初具有相同遗传背景的群落，在存在相同入侵者的情况下，根据特定的环境条件和群落均匀性，在入侵性和功能方面以不同的方式做出反应。
Biological invasion is widely studied, however, conclusions on the outcome of this process mainly originate from observations in systems that leave a large number of experimental variables uncontrolled. Here using a fully controlled system consisting of assembled bacterial communities, we evaluate the degree of invasion and the effect on the community functionality in relation to the initial community evenness under specific environmental stressors. We show that evenness influences the level of invasion and that the introduced species can promote functionality under stress. The evenness-invasibility relationship is negative in the absence and neutral in the presence of stress. Under these conditions, the introduced species is able to maintain the functionality of uneven communities. These results indicate that communities, initially having the same genetic background, in the presence of the same invader, react in a different way with respect to invasibility and functionality depending on specific environmental conditions and community evenness.