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Biotic Interactions Overrule Plant Responses to Climate, Depending on the Species' Biogeography

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  • Astrid Welk
  • Erik Welk
  • Helge Bruelheide

Abstract

This study presents an experimental approach to assess the relative importance of climatic and biotic factors as determinants of species' geographical distributions. We asked to what extent responses of grassland plant species to biotic interactions vary with climate, and to what degree this variation depends on the species' biogeography. Using a gradient from oceanic to continental climate represented by nine common garden transplant sites in Germany, we experimentally tested whether congeneric grassland species of different geographic distribution (oceanic vs. continental plant range type) responded differently to combinations of climate, competition and mollusc herbivory. We found the relative importance of biotic interactions and climate to vary between the different components of plant performance. While survival and plant height increased with precipitation, temperature had no effect on plant performance. Additionally, species with continental plant range type increased their growth in more benign climatic conditions, while those with oceanic range type were largely unable to take a similar advantage of better climatic conditions. Competition generally caused strong reductions of aboveground biomass and growth. In contrast, herbivory had minor effects on survival and growth. Against expectation, these negative effects of competition and herbivory were not mitigated under more stressful continental climate conditions. In conclusion we suggest variation in relative importance of climate and biotic interactions on broader scales, mediated via species-specific sensitivities and factor-specific response patterns. Our results have important implications for species distribution models, as they emphasize the large-scale impact of biotic interactions on plant distribution patterns and the necessity to take plant range types into account.

Suggested Citation

  • Astrid Welk & Erik Welk & Helge Bruelheide, 2014. "Biotic Interactions Overrule Plant Responses to Climate, Depending on the Species' Biogeography," PLOS ONE, Public Library of Science, vol. 9(10), pages 1-11, October.
  • Handle: RePEc:plo:pone00:0111023
    DOI: 10.1371/journal.pone.0111023
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    1. Ragan M. Callaway & R. W. Brooker & Philippe Choler & Zaal Kikvidze & Christopher J. Lortie & Richard Michalet & Leonardo Paolini & Francisco I. Pugnaire & Beth Newingham & Erik T. Aschehoug & Cristin, 2002. "Positive interactions among alpine plants increase with stress," Nature, Nature, vol. 417(6891), pages 844-848, June.
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