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During phytosociological studies conducted in old river beds of the San river within the area of the Kotlina Sandomierska basin, the occurrence of two associations of aquatic vegetation was recorded: Lemno minoris Salvinietum natantis (Slavnić 1956) Korneck 1959 and Hydrocharitetum morsus ranae van Langendonck 1935 with participation of Salvinia natans. Taking into account the fact that this is a...
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