Plant Sociology 57(2) 2020, 1–16 | DOI 10.3897/pls2020571/06 Società Italiana di Scienza della Vegetazione (SISV) Cyperus-dominated vegetation in the eastern Po river Mauro Pellizzari Istituto Comprensivo “Bentivoglio”, Via Salvo D’Acquisto 5/7, I-44028 Poggio Renatico, Italy Corresponding author: Mauro Pellizzari (
[email protected]) Subject editor: Gianluigi Bacchetta ♦ Received 28 February 2020 ♦ Accepted 13 July 2020 ♦ Published 16 September 2020 Abstract The ephemeral vegetation dominated by Cyperus sp. pl. was surveyed and analyzed along the eastern trait of the Po River (Po Plain, Italy). Two formerly described communities were recognized: Cyperetum esculenti and Amaranthus tuberculatus-phytocoenon. A third greater cluster is assigned to a new association: Cyperetum micheliano-glomerati. It is characterized by Cyperus glomeratus, C. michelianus, C. odoratus and C. squarrosus, that have been detected on over 75 % of the relevés. The main floristic and ecological traits of these detected vegetation types are discussed. Keywords Bidention, Chenopodion rubri, Cyperaceae, Italy, phytosociology, therophytes Introduction Some case studies showed that riparian invasive plants can change the natural habitats: fast-growing trees and The biodiversity changes caused by human activities are shrubs can affect river biodynamics, sedimentation and global-scale phenomena; invasive alien species (IAS) threat erosion processes (van Oorschot et al. 2017). Perennial the diversity in the European countries from a biological tall herbs as Reynoutria spp. and annual vines as Humulus and ecosystemic perspective. Following the milestone set japonicus or Sicyos angulatus can create dense canopies by the DAISIE Project (an overview is in Lambdon et al. that outcompete other species (Gerber et al.