Freshwater ecosystems provide goods and service to human society and invasion is a major threat to them. Plant invasion affect community dynamics, threatens biodiversity and promote biological homogenization. In this study we explore functional traits in three groups of species e.g. invasive species, disturbance-tolerant species and rare species in lowland streams. In order to investigate the role of functional traits for species distributional patterns we investigate relationships between a range of species features and species abundance in app. 1,200 stream sites in Denmark covering a gradient in size and water alkalinity. We applied a co-inertia analysis including functional traits (e.g. life form, vegetative propagation, pollen vector), bioindicator values and Grime CSR scores to investigate their significance for species distributional pattern. We found a clear correlation between species abundance and traits related to dispersal as vegetative propagation and diaspores type. We discuss the obtained results in relation to species invasion in lowland streams being highly influenced by anthropogenic disturbances.
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54th Symposium of the International Association for Vegetation Science, 2011