Taxonomic study and local environmental conditions of occurrence of Chlorophyceae (Chlorophyta) from subtropical lotic environments, Paraná, Brazil

Abstract Lotic environments are subjected to the impacts of human activities in an intense way urban regions and one ways assist environmental diagnosis is through knowledge composition bioindicator organisms, including microalgae. The objective this work was qualitatively characterize Chlorophyceae Class Wille, providing descriptions meristic data specimens as well conditions which taxa were recorded. Water phytoplankton samplings carried out quarterly 2020, nine supply rivers, distributed three river basins western region Paraná (Paraná III basin, Piquiri basin Baixo Iguaçu basin). studied rivers classified oligotrophic or mesotrophic mostly rare. Thirty-six belonging class recorded, five families: Hydrodictyaceae Dumortier, Neochloridaceae Ettl & Komárek, Radiococcaceae Fott ex P.C.Silva, Scenedesmaceae Oltmanns, Selenastraceae Blackman Tansley. These have mainly cenobial representatives, with about 70% individuals thallus configuration, followed by 22% colonies 8% unicellular thallus. Among identified species, occurred only sites, warning for tendencies elevate their trophic, since they genera previously associated these conditions. Ten new citations recorded State Paraná, namely: Pseudopediastrum boryanum var. longicorne (Reinsch) P.M.Tsarenko, Radiococcus skujae I.Kostikov, T.Darienko, A.Lukesová L.Hoffmann, Desmodesmus perforatus (Lemmermann) E.Hegewald, subspicatus (Chodat) E.Hegewald A.W.F.Schmidt, Scenedesmus indicus Philipose Hegewald, Engelberg Paschma, Ankistrodesmus bernardii Monoraphidium capricornutum (Printz) Nygaard, caribeum Hindák, Raphidocelis danubiana elegans (Playfair) Taşkin Alp, Selenastrum rinoi Komárek Comas. Taxonomic studies, such one, important tool understanding flora, addition contributing registration species aquatic ecosystems, serve a basis ecological studies other approaches used preserve biodiversity places.