Facilitative plant interactions and climate simultaneously drive alpine plant diversity

Lohengrin A. Cavieres, Rob W. Brooker, Bradley J. Butterfield, Bradley J. Cook, Zaal Kikvidze, Christopher J. Lortie, Richard Michalet, Francisco I. Pugnaire, Christian Schöb, Sa Xiao, Fabien Anthelme, Robert G. Björk, Katharine J.M. Dickinson, Brittany H. Cranston, Rosario Gavilán, Alba Gutiérrez-Girón, Robert Kanka, Jean Paul Maalouf, Alan F. Mark, Jalil NorooziRabindra Parajuli, Gareth K. Phoenix, Anya M. Reid, Wendy M. Ridenour, Christian Rixen, Sonja Wipf, Liang Zhao, Adrián Escudero, Benjamin F. Zaitchik, Emanuele Lingua, Erik T. Aschehoug, Ragan M. Callaway

Research output: Contribution to journalArticlepeer-review

275 Scopus citations

Abstract

Interactions among species determine local-scale diversity, but local interactions are thought to have minor effects at larger scales. However, quantitative comparisons of the importance of biotic interactions relative to other drivers are rarely made at larger scales. Using a data set spanning 78 sites and five continents, we assessed the relative importance of biotic interactions and climate in determining plant diversity in alpine ecosystems dominated by nurse-plant cushion species. Climate variables related with water balance showed the highest correlation with richness at the global scale. Strikingly, although the effect of cushion species on diversity was lower than that of climate, its contribution was still substantial. In particular, cushion species enhanced species richness more in systems with inherently impoverished local diversity. Nurse species appear to act as a 'safety net' sustaining diversity under harsh conditions, demonstrating that climate and species interactions should be integrated when predicting future biodiversity effects of climate change.

Original languageEnglish
Pages (from-to)193-202
Number of pages10
JournalEcology Letters
Volume17
Issue number2
DOIs
StatePublished - Feb 2014

Keywords

  • Alpine
  • Cushion species
  • Foundation species
  • Nurse plants
  • Positive interactions
  • Species richness

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