Biological Invasions

, Volume 14, Issue 12, pp 2559–2572 | Cite as

Determinants of non-native plant species richness and composition across small Mediterranean islands

  • F. Pretto
  • L. Celesti-Grapow
  • E. Carli
  • G. Brundu
  • C. Blasi
Original Paper
First Online:
Received:
Accepted:

Abstract

The main aim of this paper is to assess the drivers of non-native plant species richness and composition on a set of 37 small Mediterranean islands in Italy. We compiled the list of the non-native flora and distinguished species according to their establishment status. The non-native flora of the islands studied consists of 154 species, 105 of which are established on at least one island. Regression tree analysis revealed that the main determinants of both total non-native and established non-native species richness are the variables linked to tourist development and the sprawl of artificial surfaces. The variation partitioning approach shows that the variation in total non-native flora composition is driven above all by environmental variables, whereas when established taxa are considered, human-mediated factors account for most of the explained variation. Mediterranean islands have recently experienced changes in the type and intensity of human activities, leading to a decline in rural landscape and the development of tourist facilities. Our results indicate that tourism and the increase in the extension of artificial surfaces are also the main drivers of non-native plant species occurrence and establishment. These factors outweigh the effects of abiotic variables such as climate and lithology in determining the number of non-native species, whether it be total or established, as well as variations in the composition of established species. High human pressure and ornamental introductions associated with tourist activities appear to be the key elements that need to be considered when planning strategies aimed at managing plant invasions in Mediterranean islands.

Keywords

Introduced flora Italy Plant invasions Regression tree Tourism Variation partitioning 
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Notes

Acknowledgments

We would like to thank the following regional experts who provided a large amount of data on the non-native flora of the Italian islands for the project “A survey of the non-native flora of Italy”, funded by the Italian Ministry for the Environment, Land and Sea Protection: Pier Virgilio Arrigoni, Ignazio Camarda, Emanuele Del Guacchio, Gianniantonio Domina, Pietro Mazzola, Simonetta Peccenini and Lucia Viegi. We are most grateful to Bruno Foggi for providing information and unpublished data on plant invasion in the Tuscan Archipelago. We also wish to thank Aldo Marchetto and Francesco Maria Sabatini for their help with the statistical analysis, as well as Sabina Burrascano, Montserrat Vilà and two anonymous reviewers whose valuable comments and suggestions improved this work.

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • F. Pretto
    • 1
  • L. Celesti-Grapow
    • 1
  • E. Carli
    • 1
    • 2
  • G. Brundu
    • 3
  • C. Blasi
    • 1
  1. 1.Environmental Biology DepartmentSapienza University of RomeRomeItaly
  2. 2.S.T.A.T. DepartmentUniversity of MoliseCampobassoItaly
  3. 3.Science for Nature and Environmental Resources DepartmentUniversity of SassariSassariItaly

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