Peculiarities of species of Elodea (Hydrocharitaceae) in the aquatic ecosystems of Ukraine (East Europe)

• Autores: Mariana Prokopuk, Lesya Zub
• Localización: Phytologia Balcanica: International Journal of Balkan Flora and Vegetation, ISSN 1310-7771, Vol. 25, Nº. 3, 2019, págs. 381-386
• Idioma: inglés
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• Resumen

  • Two species of Elodea – E. canadensis and E. nuttallii, and the closely related Egeria densa, have been recorded as alien species in the Ukrainian flora. One hundred and six waterbodies (reservoirs and rivers) in the central part of the Dnipro River Basin have been surveyed which resulted in the recording of 68 localities of alien macrophyte species. Morphometric studies have been conducted in selected populations of E. canadensis and E. nuttallii and the obtained data has been compared with these from North America (native distribution range of the species) and West Europe (alien distribution range of the species). It can be inferred that in the aquatic ecosystems of Ukraine, E. densa and E. nuttallii have wider ecological valence in relation to the content of nutrients in the water and both species actively expand the borders of their secondary distribution range in the region. On the contrary, E. сanadensis shows vulnerability to anthropogenic eutrophication, and consequently, significant decrease in its coenotic activity, i.e. E. сanadensis is in the stage of regressive changes in its secondary distribution area. In Ukraine, E nuttalii forms larger populations, with morphometric parameters higher than in its primary range, but smaller than in West Europe (plants are denser and less branched).