Telekia speciosa (Schreb.) Baumg. in human made environment: spread and persistence, two sides of the same coin

For proper management of invasive alien species (IAS), it is needed to know species persistence and spread capacity as ignoring them may significantly bias the estimates of species presence. We compared 50 years old historical and current distribution of Telekia speciosa to assess its population change in a restricted area of a chateau park. The aim of this study is to analyse factors that may have shaped the persistence on previous sites, as well as, the spread of the species from historical sites by using repeated sampling. We found that after 50 years Telekia speciosa persisted at 67% sites and has spread to another 381 new sites. Such a level of persistence and rate of spread over a fifty year period goes exceedingly beyond any known records for other IAS.

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