Yang Tianjie, Wei Zhong, Friman Ville-Petri, Xu Yangchun, Shen Qirong, Kowalchuk George A, Jousset Alexandre
Jiangsu Provincial Key Lab for Organic Solid Waste Utilization, National Engineering Research Center for Organic-based Fertilizers, Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing Agricultural University, 210095, Nanjing, People's Republic of China.
Institute for Environmental Biology, Ecology & Biodiversity, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands.
Environ Microbiol. 2017 Aug;19(8):2984-2991. doi: 10.1111/1462-2920.13708. Epub 2017 Mar 20.
Community diversity affects the survival of newly introduced species via resource competition. Competitive interactions can be modulated by resource availability and we hypothesized that this may alter biodiversity-invasion relationships. To study this, we assessed the growth of a bacterial invader, Ralstonia solanacearum, when introduced into communities comprised of one to five closely related resident species under different resource concentrations. The invader growth was then examined as a function of resident community richness, species composition and resource availability. We found that the relative density of the invader was reduced by increasing resident community richness and resource availability. Mechanistically, this could be explained by changes in the competitive interactions between the resident species and the invader along the resource availability gradient. At low resource availability, resident species with a high catabolic similarity with the invader efficiently reduced the invader relative density, while at high resource availability, fast-growing resident species became more important for the invader suppression. These results indicate that the relative importance of different resident community species can change dynamically along to resource availability gradient. Diverse communities could be thus more robust to invasions by providing a set of significant species that can take suppressive roles across different environments.
群落多样性通过资源竞争影响新引入物种的生存。竞争相互作用可由资源可用性调节，我们推测这可能会改变生物多样性与入侵的关系。为了研究这一点，我们评估了细菌入侵者青枯雷尔氏菌（Ralstonia solanacearum）在不同资源浓度下被引入由一至五个密切相关的本地物种组成的群落时的生长情况。然后，将入侵者的生长作为本地群落丰富度、物种组成和资源可用性的函数进行研究。我们发现，增加本地群落丰富度和资源可用性会降低入侵者的相对密度。从机制上讲，这可以通过本地物种与入侵者之间沿着资源可用性梯度的竞争相互作用的变化来解释。在低资源可用性下，与入侵者具有高分解代谢相似性的本地物种有效地降低了入侵者的相对密度，而在高资源可用性下，快速生长的本地物种对抑制入侵者变得更为重要。这些结果表明，不同本地群落物种的相对重要性可以沿着资源可用性梯度动态变化。因此，多样化的群落可能通过提供一组能够在不同环境中发挥抑制作用的重要物种，从而对入侵具有更强的抵抗力。
