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Effects of Ailanthus altissima Invasion and Removal on High-Biodiversity Mediterranean Grasslands

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A Correction to this article was published on 23 September 2021

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Abstract

Ailanthus altissima is one of the worst invasive plants in Europe in several habitat types, including high-biodiversity grasslands. The aim of this work was to evaluate the impact of the invasive A. altissima on high-biodiversity grassland vegetation and the effects of its removal on the recovery of native plant communities. The study area was within the Alta Murgia National Park (SE Italy). Seventeen vegetation quadrats were sampled in invaded grasslands and nine quadrats were sampled in nearby uninvaded areas. A. altissima was removed from six quadrats, which were sampled for two years after plant removal. Cluster analysis and non-metric multidimensional scaling ordination were used to identify and visualize the general vegetation pattern. Generalised Linear Models with different error structures were used to analyse the effects of A. altissima on native grasslands and vegetation recovery after removal. Results showed that the invasion of A. altissima changed drastically the community composition, reduced plant richness and diversity. Invaded stands had a greater presence of ruderal and widely distributed taxa, as opposed to a lesser presence of endemic and Mediterranean ones. The differences in the community composition between invaded and uninvaded quadrats became clearly detectable when A. altissima plants exceeded a threshold of 1 m of height and 50% of coverage. After A. altissima removal, the recovery of the grassland community was not completely achieved after two years.

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Availability of data and material

All data generated during this study are included in this published article as Supplementary Material.

Code availability

All scripts and datasets for the analyses are available on GitHub at https://github.com/diegofontaneto/ailanthus.

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Acknowledgements

This work was supported by the LIFE Programme, a financial instrument for the environment of the European Commission. We thank Maurizio Vurro for his suggestions on the first draft of this paper, Rocco Labadessa for his help during some field surveys, and two anonymous referees for their helpful comments.

Authors’ contributions

MT and FC conceived the study and collected data; FC coordinated the Ailanthus removal interventions; DF and MT performed the analysis; MT led the writing and all authors checked, improved and approved the manuscript.

Funding

This study was partially funded by the European Commission under the Life Biodiversity Programme (Life Alta Murgia project - LIFE12 BIO/IT/000213).

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Correspondence to Massimo Terzi.

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The authors declare no competing interests.

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Terzi, M., Fontaneto, D. & Casella, F. Effects of Ailanthus altissima Invasion and Removal on High-Biodiversity Mediterranean Grasslands. Environmental Management 68, 914–927 (2021). https://doi.org/10.1007/s00267-021-01522-6

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  • DOI: https://doi.org/10.1007/s00267-021-01522-6

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