Facilitative plant interactions and climate simultaneously drive alpine plant diversity

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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https://hal.umontpellier.fr/hal-02063277
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Soumis le : lundi 11 mars 2019 - 09:44:29
Dernière modification le : samedi 20 avril 2019 - 01:53:40

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Lohengrin Cavieres, Rob W. Brooker, Bradley J. Butterfield, Bradley Cook, Zaal Kikvidze, et al.. Facilitative plant interactions and climate simultaneously drive alpine plant diversity. Ecology Letters, Wiley, 2014, 17 (2), pp.193-202. ⟨10.1111/ele.12217⟩. ⟨hal-02063277⟩

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