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Table 1

List of charophyte communities identified in the analysed lakes (n = 504) and lake-surveys (n = 739); syntaxa arranged according to the frequency of occurrence F(%) in descending order.

Community (syntaxa) Dominant species n (lakes) n (lake-years) F(%) n = 739
Nitellopsidetum obtusae (Sauer 1937) Dąmbska 1961 Nitellopsis obtusa (Desvaux in Loiseleur-Deslongchamps) J. Groves 1919 216 303 41.0
Charetum tomentosae Corillion 1957 Chara tomentosa Linné 1753 152 198 26.9
Charetum fragilis Fijałkowski 1960 Chara globularis Thuillier 1799 (=Chara fragilis Desvaux in Loiseleur-Deslongchamps 1810) 143 187 25.3
Charetum delicatulae Doll 1989 ex Gąbka et Owsianny 2010 Chara delicatula Agardh 1824 67 82 11.1
Charetum asperae Corillion 1957 Chara aspera Detharding ex Willdenow 1809 43 53 7.2
Charetum contrariae Corillion 1957 Chara contraria A. Braun ex Kützing 1845 40 46 6.2
Charetum rudis Dąmbska 1966 Chara rudis A. Braun in Leonhardi 1882 38 43 5.8
Nitelletum flexilis Corillion 1957 Nitella flexilis (Linné) Agardh 1824 32 37 5.0
Charetum vulgaris Corillion 1957 Chara vulgaris Linné 1753 22 27 3.7
Charetum filiformis (Jeschke 1959) Krausch 1964 em. Dąmbska 1966 Chara filiformis Hertzsch 1855(=Chara jubata A. Braun) 23 25 3.4
Charetum intermediae (Corillion 1957) Fijałkowski 1960 Chara intermedia A. Braun 1836 (= Chara aculeolata Kützing in Reichenbach 1832) 23 24 3.2
Charetum hispidae Corillion 1957 Chara hispida Linné 1753 12 13 1.8
Nitelletum gracilis Corillion 1957 Nitella gracilis (Smith) Agardh 1828 11 12 1.6
Charetum polyacanthae Dąmbska 1966 ex Gąbka et Pełechaty 2003 Chara polyacantha A. Braun in Braun, Rabenhorst et Stizenberger 1859 11 11 1.5
Nitelletum mucronatae Tomaszewicz ex Hrivnák et al., 2001 Nitella mucronata (A. Braun) Miquel 1840 6 7 0.9
Nitelletum opacae Corillion 1957 Nitella opaca (Bruzelius) Agardh 1824 6 7 0.9
Lychnothamnetum barbati (Gołdyn 1984) Brzeg et Wojterska 2001 Lychnothamnus barbatus (Meyen) Leonhardi 1863 3 4 0.5
Charetum tenuispinae Dąmbska 1966 ex Tomaszewicz 1979 Chara tenuispina A. Braun 1835 2 2 0.3
Nitelletum syncarpae (Corillon 1957) Dąmbska 1966 Nitella syncarpa (Thuillier) Chevalier 1827 1 1 0.1
Charetum strigosae (Dąmbska 1966) Chara strigosa A. Braun 1847 1 1 0.1

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