Abstract
<em>Nymphaeion</em> alliance vegetation is dominant floating-leaved vegetation in the Danube–Tisza–Danube hydrosystem in northwestern Serbia and comprises <em>Nymphaeetum albae</em>, <em>Nymphaeetum albo-luteae</em>, <em>Nymphoidetum peltatae</em> and <em>Trapetum natantis</em> associations. Comparative analysis of physical-chemical water parameters on localities where these – in most parts of Europe endangered and vulnerable stands – develop showed that most phytocenoses are associated with specific habitat conditions. Of the analyzed water properties, the factors that cause <em>Nymphaeion</em> alliance phytocenoses differentiation are primarily pH, alkalinity and COD-MnO<sub>4</sub>. Formation of the <em>Nymphaeetum albae</em> stands is significantly associated with the highest values of pH, COD-MnO<sub>4</sub> and alkalinity, and the lowest nitrate, nitrite, dissolved and the total phosphorus content values, in comparison to the other studied associations. <em>Nymphoidetum peltatae</em> stands develop in waters characterized by the lowest pH and COD-MnO<sub>4</sub>, low alkalinity, and the highest nitrate and nitrite values in relation to the other analyzed phytocenoses. <em>Trapetum natantis</em> stands, on the other hand, prefer the warmer sections of the canal network, neutral pH, and the highest values of BOD<sub>5</sub>, dissolved and total phosphorus. Habitat conditions in which <em>Nymphaeetum albo-luteae</em> stands develop are of the widest range in comparison to other investigated phytocenoses.
Highlights
Floating-leaved plants are a common component of channels, rivers, lakes, ponds and other water basins
The aim of this paper is to present floristic composition, distribution and physical-chemical water parameters of Trapetum natantis, Nimphaeetum albo-luteae, Nimphaeetum albae and Nimphoidetum peltatae stands in northwestern Serbia, which are valuable in the aquatic ecosystem biodiversity conservation efforts
Floating-leaved vegetation Nymphaeion of Hydrosystem Danube–Tisza–Danube (Hs DTD) is represented by stands of associations Nymphaeetum albae, Nymphaeetum albo-luteae, Nymphoidetum peltatae and Trapetum natantis
Summary
Floating-leaved plants are a common component of channels, rivers, lakes, ponds and other water basins. 1956 alliance play an important role in the shallow aquatic ecosystems [1]. This alliance is represented by stands of the following associations: Nymphaeetum albae Vollmar 1947, Nymphaeetum albo-luteae Nowinski 1928, Nymphoidetum peltatae (Allorge 1922) Oberd. Nuphar lutea and Nymphoides peltata have least concern status on the “Red list of threatened species for Europe” [3], while N. alba and N. lutea have strictly protected national conservation status in Serbia [4]. Nymphoidetum peltatae stands in aquatic vegetation of Vojvodina are in the withdrawal phase [5]. Trapa natans, Handling Editor: Aleksandra Samecka-Cymerman the edificator of Trapetum natantis association, is threatened in much of Europe and is subject of conservation efforts aimed at preserving and restoring its population (IUCNLC). T. natans is located on the red lists of many European countries [3], and is included under “Appendix I” of the “Convention on the conservation of European wildlife and natural habitats” (Bern Convention) and IPA list (IPA criterion A, threatened species)
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