Temporal variability in aboveground plant biomass decreases as spatial variability increases

Devan Allen McGranahan, Torre J. Hovick, R. Dwayne Elmore, David M. Engle, Samuel D. Fuhlendorf, Stephen L. Winter, James R. Miller, Diane M. Debinski

Research output: Contribution to journalArticle

Abstract

Ecological theory predicts that diversity decreases variability in ecosystem function. We predict that, at the landscape scale, spatial variability created by a mosaic of contrasting patches that differ in time since disturbance will decrease temporal variability in aboveground plant biomass. Using data from a multi-year study of seven grazed tallgrass prairie landscapes, each experimentally managed for one to eight patches, we show that increased spatial variability driven by spatially patchy fire and herbivory reduces temporal variability in aboveground plant biomass. This pattern is associated with statistical evidence for the portfolio effect and a positive relationship between temporal variability and functional group synchrony as predicted by metacommunity variability theory. As disturbance from fire and grazing interact to create a shifting mosaic of spatially heterogeneous patches within a landscape, temporal variability in aboveground plant biomass can be dampened. These results suggest that spatially heterogeneous disturbance regimes contribute to a portfolio of ecosystem functions provided by biodiversity, including wildlife habitat, fuel, and forage. We discuss how spatial patterns of disturbance drive variability within and among patches.

Original languageEnglish (US)
Pages (from-to)555-560
Number of pages6
JournalEcology
Volume97
Issue number3
DOIs
StatePublished - Mar 1 2016

Keywords

  • Asynchrony
  • Diversity-stability relationship
  • Ecosystem function
  • Fire-grazing interaction
  • Metacommunity variability
  • Patch burn-grazing
  • Portfolio effect
  • Pyric herbivory

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

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  • Cite this

    McGranahan, D. A., Hovick, T. J., Elmore, R. D., Engle, D. M., Fuhlendorf, S. D., Winter, S. L., Miller, J. R., & Debinski, D. M. (2016). Temporal variability in aboveground plant biomass decreases as spatial variability increases. Ecology, 97(3), 555-560. https://doi.org/10.1890/15-0906