Habitat requirements of Polygonetum natantis Soó 1927 and Potamogetonetum natantis Soó 1927 phytocenoses in north-eastern Poland

Abstract

Comparison of habitats of Polygonetum natantis Soó 1927 and Potamogetonetum natantis Soó 1927 phytocenoses as regards physical and chemical properties of the water and substrate demonstrated that the habitat requirements of both these communities are different. Polygonetum natantis phytocenoses indicate a substrate poor in nutrient components and rich waters, whereas Potamogetonetum natantis patches, on the contrary, are evidence of fertile substrate and waters poor in biophilous components. The differences in habitat conditions demonstrated between the examined communities confirm the correctness of narrow classification of aquatic plant communities, based on floristic dominance.