Biodiversity increases and decreases ecosystem stability

Research output: Contribution to journalLetter

Abstract

Losses and gains in species diversity affect ecological stability1–7 and the sustainability of ecosystem functions and services8–13. Experiments and models have revealed positive, negative and no effects of diversity on individual components of stability, such as temporal variability, resistance and resilience2,3,6,11,12,14. How these stability components covary remains poorly understood15. Similarly, the effects of diversity on overall ecosystem stability16, which is conceptually akin to ecosystem multifunctionality17,18, remain unknown. Here we studied communities of aquatic ciliates to understand how temporal variability, resistance and overall ecosystem stability responded to diversity (that is, species richness) in a large experiment involving 690 micro-ecosystems sampled 19 times over 40 days, resulting in 12,939 samplings. Species richness increased temporal stability but decreased resistance to warming. Thus, two stability components covaried negatively along the diversity gradient. Previous biodiversity manipulation studies rarely reported such negative covariation despite general predictions of the negative effects of diversity on individual stability components3. Integrating our findings with the ecosystem multifunctionality concept revealed hump- and U-shaped effects of diversity on overall ecosystem stability. That is, biodiversity can increase overall ecosystem stability when biodiversity is low, and decrease it when biodiversity is high, or the opposite with a U-shaped relationship. The effects of diversity on ecosystem multifunctionality would also be hump- or U-shaped if diversity had positive effects on some functions and negative effects on others. Linking the ecosystem multifunctionality concept and ecosystem stability can transform the perceived effects of diversity on ecological stability and may help to translate this science into policy-relevant information.

Details

Authors
  • Frank Pennekamp
  • Mikael Pontarp
  • Andrea Tabi
  • Florian Altermatt
  • Roman Alther
  • Yves Choffat
  • Emanuel A. Fronhofer
  • Pravin Ganesanandamoorthy
  • Aurélie Garnier
  • Jason I. Griffiths
  • Suzanne Greene
  • Katherine Horgan
  • Thomas M. Massie
  • Elvira Mächler
  • Gian Marco Palamara
  • Mathew Seymour
  • Owen L. Petchey
External organisations
  • University of Zurich
  • Umeå University
  • Eawag: Swiss Federal Institute of Aquatic Science and Technology
  • University of Montpellier
  • University of Utah
  • Massachusetts Institute of Technology
  • Bangor University
Original languageEnglish
Pages (from-to)109-112
JournalNature
Volume563
Issue number7729
Publication statusPublished - 2018 Nov 1
Publication categoryResearch
Peer-reviewedYes
Externally publishedYes