Invasive plant species in the Swedish flora: developing criteria and definitions, and assessing the invasiveness of individual taxa

摘要: In a north European context, identifying invasive species is far from trivial because the vegetation has been influenced by human activities for thousands of years. New have immigrated continuously since end last glaciation, both spontaneously and through direct or indirect help man. Still, newly may be problematic in nature conservation context harm biodiversity, cause changes ecosystem services. this study, all 721 presently established vascular plant bryophyte taxa known to introduced to, Sweden year 1700 are assessed their potential. The assessment based on six components considered relevant invasiveness: 1) ability compete natural vegetation, 2) form dense populations, 3) realized dispersal ability, 4) gene flow native relatives, 5) time immigration 6) distance range. Although relative importance these dependent, compound general index concern proposed calculated taxa. validated comparing it assessments Bayesian Belief Network which influences same assigned expert opinions. addition, rough estimates present-day abundance each taxon presented. origin, biology possible impact 150 with highest values discussed. Based concern, Campylopus introflexus, Epilobium adenocaulon, E. ciliatum, Rosa rugosa, Lamiastrum galeobdolon subsp. argentatum, Orthodontium lineare, Solidago canadensis, Calystegia sepium spectabilis, Rubus armeniacus Prunus serotina identified as ten most alien Sweden.