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Are some communities of the coastal dune zonation more susceptible to alien plant invasion?

Journal of Plant Ecology 2010年第2期3卷 139-147页

作者： M.Carboni R.Santoro A.T.R.Acosta Dipartimento di Biologia Ambientale Universita`degli Studi di Roma TreViale Marconi 44600146 RomaItaly

Aims Coastal areas,and in particular coastal dunes,are ecosystems strongly affected by the invasion of alien ***,few attempts have ever been made to quantify alien species incidence in different communities along the coastal *** work aims to analyze the distribution of alien plants along the coastal zonation of sandy shores on the Tyrrhenian coast,addressing specifically differences among plant communities in abundance of alien *** The study was performed on recent dunes(Holocene)of the central western coast of *** selected dune landscapes where invasion processes were particularly *** plots were randomly sampled and through cluster analysis,we identified six plant communities corresponding to the typical zonation described for the Tyrrhenian sandy coast of central *** evaluated and compared frequency and abundance of invasion in these different ***,we investigated how propagule pressure(measured using as proxy human structures)contributed to the observed invasion *** Findings We found a relatively low total number of aliens but also a differential distribution pattern and strong abundance of some of the aliens in specific sectors of the vegetation *** perennial community of transition dunes appears most affected by invasion processes,related almost exclusively to the frequent and widespread Carpobrotus *** alien species reaches high cover values,apparently lowering cover of native species of transition dune plant *** levels of invasion in the transition dune can be partially explained because of greater propagule pressure in this section of the dune *** findings thus have important conservation and management implications since transition dune communities with Crucianella maritima are rare and protected(sensu Habitat 92/43/EEC Directive)along the entire Italian coast.

关键词： level of invasion propagule pressure Carpobrotus aff.acinaciformis central italy coastal communities

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