Współczesna szata roślinna Zalewu Rzeszowskiego (południowo-wschodnia Polska)

Abstract

This paper presents the results of current research on the vegetation and flora of the Rzeszów Reservoir (SE Poland). The research was carried out in 2016–2019. In the study, the relevés were performed using the Braun-Blaquet method. Based on 147 phytosociological relevés, 21 plant communities belonging to 5 classes (Lemnetea, Potametea, Phragmitetea, Molinio-Arrhenatheretea, and Salicetea purpureae) were identified. Trapetum natantis, Typhetum latifoliae, Typhetum angustifoliae, Glycerietum maximae, Leersietum oryzoidis, Salicetum triandro- viminalis were the most common, whereas Spirodeletum polyrhizae, Utricularia vulgaris, Potametum natantis, Eleocharitetum palustris, and Caricetum gracilis were rare communities. Noteworthy is the association Trapetum natantis, a rare and endangered plant community whose population is developing dynamically in the reservoir. The vascular flora of the Rzeszów Reservoir is represented by 334 taxa belonging to 66 families, including two strictly protected species (Dianthus armeria, Trapa natans), one partially protected species (Epipactis helleborine), and four species from the Polish red list (Trapa natans – VU, Potamogeton obtusifolius, Utricularia vulgaris, Leersia oryzoides – NT).