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Vegetation of the Hydrochari-Lemnetea and Potametea classes in the Danube-Tisza-Danube hydrosystem (Serbia)

Aquatic vegetation of Hydrochari-Lemnetea and Potametea classes in the Danube-Tisza-Danube hydrosystem (Hs DTD) was studied in 2009–2012, by applying the standard Braun-Blanquet method. The canal network vegetation comprises 14 associations, with Trapetum nаtantis and Ceratophylletum demersi being the most widely distributed. Hs DTD is also a habitat for several important endangered species, which serve as edificators of the following phytocenoses: Nymphaeetum albae, Nymphaeetum albo-luteae, Nymphoidetum peltatae, Trapetum nаtantis, Lemno-Spirodeletum, Salvinio-Spirodeletum polyrrhizae, LemnoUtricularietum vulgaris, Potametum nodosi, Myriophyllo-Potametum and Najadetum marinаe. In the studied vegetation, we also found an invasive phytocenosis Elodeetum canadensis that did not have an expanding tendency, and Ceratophyllo demersi-Vallisnerietum spiralis that had this tendency, which made monitoring its stands necessary. Physico-chemical analyses of water, conducted at localities in which the studied phytocenoses thrive, revealed that the development and distribution of most phytocenoses is closely linked with specific habitat conditions. Among the studied parameters, the most significant for the phytocenoses differentiation were: pH, alkalinity, COD-MnO , BOD , NO– NO– , PO3– and the concentration of total phosphorus. 4 5 3 , 2 4

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Сибирский экологический журнал, 3 (2016) 390404 УДК 574.5 DOI 10.15372/SEJ20160310 Vegetation of the Hydrochari-Lemnetea and Potametea classes in the Danube-Tisza-Danube hydrosystem (Serbia) 21000, Serbia, Novi Sad, Trg Dositeja Obradoviæa, 8 E-mail: branà@polj.uns.ac.rs D. DIGURSKI, Lj. <...> NIKOLIЖ, B. LJEVNAIЖ-MAIЖ Faculty of Agriculture University of Novi Sad Статья поступила 20.10.15 Принята к печати 02.12.15 ABSTRACT Aquatic vegetation of Hydrochari-Lemnetea and Potametea classes in the Danube-Tisza-Danube hydrosystem (Hs DTD) was studied in 20092012, by applying the standard Braun-Blanquet method. <...> The canal network vegetation comprises 14 associations, with Trapetum nаtantis and Ceratophylletum demersi being the most widely distributed. <...> Hs DTD is also a habitat for several important endangered species, which serve as edificators of the following phytocenoses: Nymphaeetum albae, Nymphaeetum albo-luteae, Nymphoidetum peltatae, Trapetum nаtantis, Lemno-Spirodeletum, Salvinio-Spirodeletum polyrrhizae, LemnoUtricularietum vulgaris, Potametum nodosi, Myriophyllo-Potametum and Najadetum marinаe. <...> In the studied vegetation, we also found an invasive phytocenosis Elodeetum canadensis that did not have an expanding tendency, and Ceratophyllo demersi-Vallisnerietum spiralis that had this tendency, which made monitoring its stands necessary. <...> Among the studied parameters, the most significant for the phytocenoses differentiation were: pH, alkalinity, COD-MnO4, BOD5, tration of total phosphorus. <...> However, the canal network development resulted in successive disappearance of many marshes and swamps, together with specific aquatic and semiaquatic vegetation. <...> The aim of this work is to analyze the current state of the vegetation diversity in the secondary aquatic ecosystem, in the light of the changed water quality conditions of watercourses in this part of Europe that have been observed in recent decades. <...> All videos were registered in a phytocenological synoptic table, in which level of presence (IV), number and coverage (+, 1, 2, 3, 4, 5) were given for each species. <...> Lemna minor L. Salvinia nаtans (L.) Allioni Ceratophyllum demersum L. Hydrocharis morsus-ranàe L. Utricularia vulgaris L. V14 III1 IV3 II1 IV1 IV2 V14 IV2 IV1 <...>
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