Stability of grassland production is robust to changes in the consumer food web

Research output: Contribution to journalLetterpeer-review

1 Scopus citations

Abstract

Theory predicts that consumers may stabilise or destabilise plant production depending on model assumptions, and tests in aquatic food webs suggest that trophic interactions are stabilising. We quantified the effects of trophic interactions on temporal variability (standard deviation) and temporal stability (mean/standard deviation) of grassland biomass production and the plant diversity–stability relationship by experimentally removing heterotrophs (large vertebrates, arthropods, foliar and soil fungi) from naturally and experimentally assembled grasslands of varying diversity. In both grassland types, trophic interactions proportionately decreased plant community biomass mean and variability over the course of 6 years, leading to no net change in temporal stability or the plant diversity–stability relationship. Heterotrophs also mediated plant coexistence; their removal reduced diversity in naturally assembled grasslands. Thus, herbivores and fungi reduce biomass production, concurrently reducing the temporal variability of energy and material fluxes. Because of this coupling, grassland stability is robust to large food web perturbations.

Original languageEnglish (US)
Pages (from-to)707-716
Number of pages10
JournalEcology letters
Volume22
Issue number4
DOIs
StatePublished - Apr 2019

Keywords

  • Biodiversity loss
  • consumer effects
  • ecosystem functioning
  • ecosystem stability
  • plant–herbivore interaction
  • plant–pathogen interaction

PubMed: MeSH publication types

  • Letter

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