Resource stoichiometry shapes community invasion resistance via productivity-mediated species identity effects
Resource stoichiometry shapes community invasion resistance via productivity-mediated species identity effects
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资源化学计量通过生产力介导的物种身份效应塑造群落的入侵抵抗力
DOI：
10.1098/rspb.2018.2035
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
re Jousset
中科院分区：
文献类型：
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作者：
Tianjie Yang;Gang Han;Qingjun Yang;Ville-Petri Friman;Shaohua Gu;Zhong Wei;George A. Kowalchuk;Yangchun Xu;Qirong Shen;Alex;re Jousset
多样性-入侵抵抗力的关系往往是可变的，并对环境条件如资源的可用性敏感。资源化学计量，即环境中不同元素的相对浓度，已被证明对不同物种之间的生理和相互作用有很强的影响。然而，其作用的多样性入侵抗性关系仍然知之甚少。在这里，我们探讨了氮（N）和磷的比例如何影响构建的微生物群落的生产力和入侵抗性的植物病原细菌，青枯雷尔氏菌。我们发现，资源的化学计量和物种的身份效应影响的入侵抵抗力的社区。高氮浓度和居民社区多样性限制入侵，和两个居民种，特别是，有很强的负面影响的相对密度的入侵者和居民社区生产力。虽然资源化学计量并不影响居民社区的平均生产力，它有利于两个物种的增长，强烈限制入侵的生产力-入侵阻力关系的斜率更负。总之，我们的研究结果表明，资源化学计量的改变可以改变社区抵抗入侵的物种生长的不成比例的影响，可能解释在富营养化下的微生物群落组成的变化。
Diversity–invasion resistance relationships are often variable and sensitive to environmental conditions such as resource availability. Resource stoichiometry, the relative concentration of different elements in the environment, has been shown to have strong effects on the physiology and interactions between different species. Yet, its role for diversity–invasion resistance relationships is still poorly understood. Here, we explored how the ratio of nitrogen (N) and phosphorus affects the productivity and invasion resistance of constructed microbial communities by a plant pathogenic bacterium,Ralstonia solanacearum. We found that resource stoichiometry and species identity effects affected the invasion resistance of communities. Both high N concentration and resident community diversity constrained invasions, and two resident species, in particular, had strong negative effects on the relative density of the invader and the resident community productivity. While resource stoichiometry did not affect the mean productivity of the resident community, it favoured the growth of two species that strongly constrained invasions turning the slope of productivity–invasion resistance relationship more negative. Together our findings suggest that alterations in resource stoichiometry can change the community resistance to invasions by having disproportionate effects on species growth, potentially explaining changes in microbial community composition under eutrophication.