Simulating plant invasion dynamics in mountain ecosystems under global change scenarios

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2018
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Carboni, Marta
Guéguen, Maya
Barros, Ceres
Georges, Damien
Boulangeat, Isabelle
Douzet, Rolland
Dullinger, Stefan
Klonner, Guenther
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Across the globe, invasive alien species cause severe environmental changes, altering species composition and ecosystem functions. So far, mountain areas have mostly been spared from large-scale invasions. However, climate change, land-use abandonment, the development of tourism and the increasing ornamental trade will weaken the barriers to invasions in these systems. Understanding how alien species will react and how native communities will influence their success is thus of prime importance in a management perspective. Here, we used a spatially and temporally explicit simulation model to forecast invasion risks in a protected mountain area in the French Alps under future conditions. We combined scenarios of climate change, land-use abandonment and tourism-linked increases in propagule pressure to test if the spread of alien species in the region will increase in the future. We modelled already naturalized alien species and new ornamental plants, accounting for interactions among global change components, and also competition with the native vegetation. Our results show that propagule pressure and climate change will interact to increase overall species richness of both naturalized aliens and new ornamentals, as well as their upper elevational limits and regional range-sizes. Under climate change, woody aliens are predicted to more than double in range-size and herbaceous species to occupy up to 20% of the park area. In contrast, land-use abandonment will open new invasion opportunities for woody aliens, but decrease invasion probability for naturalized and ornamental alien herbs as a consequence of colonization by native trees. This emphasizes the importance of interactions with the native vegetation either for facilitating or potentially for curbing invasions. Overall, our work highlights an additional and previously underestimated threat for the fragile mountain flora of the Alps already facing climate changes, land-use transformations and overexploitation by tourism.

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570 Biowissenschaften, Biologie
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alien species, biotic interactions, dynamic vegetation model, European Alps, mountain environments, ornamental species, propagule pressure
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ISO 690CARBONI, Marta, Maya GUÉGUEN, Ceres BARROS, Damien GEORGES, Isabelle BOULANGEAT, Rolland DOUZET, Stefan DULLINGER, Guenther KLONNER, Mark VAN KLEUNEN, Emily Sutton HAEUSER, 2018. Simulating plant invasion dynamics in mountain ecosystems under global change scenarios. In: Global change biology. 2018, 24(1), pp. e289-e302. ISSN 1354-1013. eISSN 1365-2486. Available under: doi: 10.1111/gcb.13879
BibTex
@article{Carboni2018-01Simul-40653,
  year={2018},
  doi={10.1111/gcb.13879},
  title={Simulating plant invasion dynamics in mountain ecosystems under global change scenarios},
  number={1},
  volume={24},
  issn={1354-1013},
  journal={Global change biology},
  pages={e289--e302},
  author={Carboni, Marta and Guéguen, Maya and Barros, Ceres and Georges, Damien and Boulangeat, Isabelle and Douzet, Rolland and Dullinger, Stefan and Klonner, Guenther and van Kleunen, Mark and Haeuser, Emily Sutton}
}
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