Facilitative plant interactions and climate simultaneously drive alpine plant diversity Article - Février 2014

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

Lohengrin A Cavieres, Rob W. Brooker, Bradley J. Butterfield, Bradley Cook, Zaal Kikvidze, Christopher Lortie, Richard Michalet, Francisco Pugnaire, Christian Schöb, Sa Xiao, Fabien Anthelme, Rob Björk, Katharine Dickinson, Brittany Cranston, Rosario Gavilán, Alba Gutiérrez-Girón, Rob Kanka, Jean-Paul Maalouf, Alan Mark, Jalil Noroozi, Rabindra Parajuli, Gareth Phoenix, Anya Reid, Wendy Ridenour, Christian Rixen, Sonja Wipf, Liang Zhao, Adrián Escudero, Benjamin Zaitchik, Emanuele Lingua, Erik Aschehoug, Ragan Callaway, Janneke Hille Ris Lambers, « Facilitative plant interactions and climate simultaneously drive alpine plant diversity  », Ecology Letters, février 2014, pp. 193-202. ISSN 1461-023X

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.

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