Abstract
The genus Hydrocharis L. combines free-floating, occasionally rooting obligate pleistophytes and rooting hydrohelophyte, which are edificators and subedificators in freshwater vegetation communities. How ecologically similar are these closely related species? It has been found that Hydrocharis dubia (Blume) Backer. and H. morsus-ranae L. are conditionally freshwater alkaliphilic mesoeutrophic, ortho-, mesoalluviophilic detrito-, psammopelophiles. Ecologically H. chevalieri (De Wild.) is isolated, it is a freshwater acidoneutrophilic meso-, mesoeutrophic, ortho-mesoalluvialophilic species indifferent to the mechanical composition of bottom sediments. The coenocomplex of H. chevalieri is characterized by abundance of helophyte communities; in the composition of the coenocomplex of two other species hydatophyte and pleistophyte communities play a key role. Communities with species of the genus Hydrocharis are characterized by simple synmorphology, relatively high species richness, and a high proportion of low-abundance species.
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