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Biodiversity and Conservation

, Volume 24, Issue 2, pp 371–392 | Cite as

The response of plant community diversity to alien invasion: evidence from a sand dune time series

  • Silvia Del Vecchio
  • Leonardo Pizzo
  • Gabriella BuffaEmail author
Original Paper

Abstract

This study examines the process of invasion of coastal dunes in north-eastern Italy along a 60-year time series considering alien attributes (origin, residence time, invasive status, and growth form strategy) and habitat properties (species richness, diversity and evenness, proportion of aliens, and proportion of focal species). Vegetation changes through time were investigated in four sandy coastal habitats, using a fine-scale diachronic approach that compared vegetation data collected by use of the same procedure, in four time periods, from the 1950s to 2011. Our analysis revealed an overall significant decline of species richness over the last six decades. Further, both the average number of species per plot and the mean focal species proportion were proved to be negatively affected by the increasing proportion of alien species at plot level. The severity of the impact, however, was found to be determined by a combination of species attributes, habitat properties, and human disturbance suggesting that alien species should be referred to as “passengers” and not as “drivers” of ecosystem change. Passenger alien species are those which take advantage of disturbances or other changes to which they are adapted but that lead to a decline in native biodiversity. Their spread is facilitated by widespread anthropogenic environmental alterations, which create new, suitable habitats, and ensure human-assisted dispersal, reducing the distinctiveness of plant communities and inducing a process of biotic homogenization.

Keywords

Alien species Anthropogenic pressure Biotic homogenization Coastal sand dune Habitat properties Time series 

Supplementary material

10531_2014_814_MOESM1_ESM.doc (109 kb)
Supplementary material 1 (DOC 109 kb)

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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • Silvia Del Vecchio
    • 1
  • Leonardo Pizzo
    • 1
  • Gabriella Buffa
    • 1
    Email author
  1. 1.Centre for Estuarine and Marine StudiesDAIS, University Ca’ Foscari of VeniceVeniceItaly

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