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Plant traits across different habitats of the Italian Alps: a comparative analysis between native and alien species

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Abstract

While it is well known that the success of alien plants in new environments greatly depends on their functional traits, to date only a few other studies have tested whether coexisting alien and native species show converging or diverging functional attributes. To our knowledge, no comparative analysis between native and alien species has been carried out in the same mountain habitats. We characterized the main habitats of the Italian Alps on the basis of plant species traits and we then tested for evidence of functional axes of variation among the habitats for native and alien plants. Finally, we tested the ‘try-harder’ and the ‘join-the-locals’ hypotheses to understand whether coexisting native and alien plant species showed converging or diverging functional attributes. Ordination analysis showed a distribution of the habitats according to the Grime’s CSR strategies, and associated to plant growth form and resource acquisition. Co-inertia analysis showed a significant association between native and alien plant traits at habitat level (RV = 0.73; Monte-Carlo test, p = 0.035). Across all species and habitats, the comparative analysis of individual traits showed that alien species have 25% higher plant height, 250% higher leaf mass, 19% lower leaf dry matter content, 10% higher SLA, and 17% longer flowering duration than native species. Overall, our findings demonstrated that aliens differ in many traits from native species in the Italian Alps, but that many of these differences disappear when one compares aliens and natives that co-occur in the same types of habitats.

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Acknowledgments

We thank Jennifer D. Welch for the linguistic revision of the text. We are grateful to Jürg Stöcklin and two anonymous referees for the insightful comments which improved the quality of the manuscript.

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Authors and Affiliations

  1. Department of Land and Agroforest Environments, University of Padova, Viale dell’Università 16, 35020, Legnaro, PD, Italy

    Matteo Dainese

  2. WSL, Swiss Federal Institute for Forest, Snow and Landscape Research, Site Lausanne, Station 2, Case postale 96, 1015, Lausanne, Switzerland

    Luca Bragazza

  3. Laboratory of Ecological Systems (ECOS), School of Architecture, Civil and Environmental Engineering (ENAC), École Polytechnique Fédérale de Lausanne (EPFL), Batiment GR, Station 2, 1015, Lausanne, Switzerland

    Luca Bragazza

  4. Department of Biology and Evolution, University of Ferrara, Corso Ercole I d’Este 32, 44100, Ferrara, Italy

    Luca Bragazza

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  1. Matteo Dainese
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Correspondence to Matteo Dainese.

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Dainese, M., Bragazza, L. Plant traits across different habitats of the Italian Alps: a comparative analysis between native and alien species. Alp Botany 122, 11–21 (2012). https://doi.org/10.1007/s00035-012-0101-4

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