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Resource stoichiometry shapes community invasion resistance via productivity-mediated species identity effects

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Author(s)

  • Tianjie Yang
  • Gang Han
  • Qingjun Yang
  • Ville-Petri Friman
  • Shaohua Gu
  • Zhong Wei
  • George A. Kowalchuk
  • Yangchun Xu
  • Qirong Shen
  • Alexandre Jousset

Department/unit(s)

Publication details

JournalProceedings of the Royal Society B: Biological Sciences
DateAccepted/In press - 19 Nov 2018
DatePublished (current) - 12 Dec 2018
Original languageEnglish

Abstract

The 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 and phosphorus affect the productivity and invasion resistance of constructed microbial communities by plant pathogenic bacterium, Ralstonia solanacearum. We found that resource stoichiometry and species identity effects affected the invasion resistance of communities. Both high nitrogen 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 favored 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
37 potentially explaining changes in microbial community composition under
38 eutrophication.

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