Communities of macroscopic green filamentous and yellow-green siphon algae (Cladophoretea) in some regions of Russia

Abstract

The survey of communities of the macroscopic green filamentous and yellow-green siphon algae has been carried out in some regions of Russia. Their classification according to the Braun-Blanquet ap­proach was offered. Communities were distinguished into a separate class Cladophoretea cl. nov. with the type order Cladophoretalia ord. nov. Two alliances, Cladopho­rion fractae all. nov (type of the order) and Vaucherio—Cladophorion glome­ratae all. nov., refer to algae phytocoenoses of stagnant and running waters, respectively. The first alliance consists of the asso­ciations Cladophoretum glomeratae Sauer 1937 (type of the alliance), Cladophoretum fractae Sauer 1937, Nitello—Vaucherietum dichotomae (S. Pass. 1904) Krausch 1964, Aegagropiletum holsaticae (Jöns 1934) Sauer 1937, Сladophoretum koktschetavensis Sviri­denko ass. nov. and Ulothricetum zonatae Sauer 1937. Whereas the second one includes the type association Vaucherio-Cladophoretum Weber-Oldecop ex ass. nov., also Cladophora rivularis, Vaucheria cf. geminata and Vaucheria terrestris communities and ass. Stigeo­clonie­tum tenuis (Fjerdingstad 1964) Arendt 1982. For all the syntaxonomical units the description is given and the information on composition, structure, ecology and distribution of the mentioned phytocoenoses is brought.