Increasing antagonistic interactions cause bacterial communities to collapse at high diversity

Joachim Becker, Nico Eisenhauer, Stefan Scheu, Alexandre Jousset

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

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 biodiversity-ecosystem 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. © 2012 Blackwell Publishing Ltd/CNRS.
Original languageEnglish
Pages (from-to)468-474
Number of pages7
JournalEcology Letters
Volume15
Issue number5
DOIs
Publication statusPublished - 1 May 2012
Externally publishedYes

Keywords

  • Allelopathy
  • Biodiversity
  • Ecosystem functioning
  • Interference competition
  • Pseudomonas fluorescens
  • Rhizosphere
  • alfalfa
  • antibiosis
  • article
  • bacterial phenomena and functions
  • bacterium
  • biodiversity
  • genetics
  • genotype
  • microbiology
  • physiology
  • plant root
  • Pythium

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