Poznań is a typical large central European city in terms of its spatial ­structure and intensive urbanisation. It has been subject to systematic botanical research for almost 200 years, consequently it is possible to follow changes in the city’s flora over a long period. The floristic studies indicate, amongst other things, that cities are areas where strong species selection takes place. The loss of indigenous elements and the spread of cosmopolitan plants lead to the uniformity of urban flora, at least within the same biogeographical region. Degradation of habitats and direct human impact on isolated populations of plants are not the only causes of species extinction, a crucial role is played by invasive alien species. Generally, there is weak competitiveness in urban environment, which promotes the establishment and spread of invasive species. As a consequence the city is a source of expansive species. This is evidenced in the history of colonisation of several alien species that occur on a massive scale in the Wielkopolski National Park, which is close to the city. Knowledge of the mechanisms of changes in urban flora and its role in modifying the vegetation cover outside the administrative boundaries of a city suggests that it is advisable to undertake specific actions in terms of environmental management.


Alien Species Herb Layer Urban Green Space Juglans Regia Domestic Garden 
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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  1. 1.Department of Plant Taxonomy, Faculty of BiologyAdam Mickiewicz UniversityPoznańPoland

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