Increasing antagonistic interactions cause bacterial communities to collapse at high diversity
Increasing antagonistic interactions cause bacterial communities to collapse at high diversity
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DOI：
10.1111/j.1461-0248.2012.01759.x
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发表时间：
2012-05-01
期刊：
影响因子：
8.8
通讯作者：
Jousset, Alexandre
中科院分区：
文献类型：
--
作者：
Becker, Joachim;Eisenhauer, Nico;Jousset, Alexandre
生物多样性是生态系统功能的主要决定因素。物种丰富的社区往往更有效地利用资源，从而提高社区绩效。然而，不同社区内部的激烈竞争也可能降低社区的功能。我们操纵了荧光假单胞菌群落的基因多样性，这是一种抑制病原体的互惠植物物种。我们在体外测量了拮抗相互作用，并将这些相互作用与细菌群落生产力(根部定植)和生态系统服务(寄主植物保护)联系起来。拮抗作用随着物种丰富度的增加而不成比例地增加。竞争对手之间的相互中毒会导致负面的互补效应，导致不同群落中的细菌密度下降高达98%，并完全失去植物保护。结果强调，拮抗作用可能决定群落功能，并导致负的生物多样性-生态系统功能关系。因此，干扰竞争可能是预测自然群落动态和性能的另一个关键因素，需要在未来的生物多样性模型中加以实施。
Biodiversity is a major determinant of ecosystem functioning. Species-rich communities often use resources more efficiently thereby improving community performance. However, high competition within diverse communities may also reduce community functioning. We manipulated the genotypic diversity of Pseudomonas fluorescens communities, a plant mutualistic species inhibiting pathogens. We measured antagonistic interactions in vitro, and related these interactions to bacterial community productivity (root colonisation) and ecosystem service (host plant protection). Antagonistic interactions increased disproportionally with species richness. Mutual poisoning between competitors lead to a negative complementarity effect, causing a decrease in bacterial density by up to 98% in diverse communities and a complete loss of plant protection. The results emphasize that antagonistic interactions may determine community functioning and cause negative biodiversityecosystem functioning relationships. Interference competition may thus be an additional key for predicting the dynamics and performance of natural assemblages and needs to be implemented in future biodiversity models.