Aquatic macrophyte traits and habitat utilization in the Upper Paraná River floodplain, Brazil

► Classification aquatic macrophyte assemblages. ► Use of a set of ordination techniques, coupled with fuzzy coding methods. ► In this study the main environment gradients were influenced by connectivity and stand size. ► The most important traits that discriminate species along these environmental gradients were size and morphology index. ► Azolla microphylla, Lemna minuta, Ricciocarpus natans and Wolffiella oblonga can be bioindicators of lakes connectivity.