Nowe stanowiska rukwi drobnolistnej Nasturtium microphyllum w Polsce

Dwa nowe stanowiska rukwi drobnolistnej Nasturtium microphyllum (Boenn.) Rchb. w Polsce stwierdzono w Wielkim Rowie w Zieleniewie koło Kołobrzegu (Wybrzeże Bałtyku) i kanale Obry Leniwej w Babimoście (Wielkopolska). Odszukane populacje są liczne w osobniki, które kwitną i owocują, unosząc się jako pło w toni wodnej czystych rowów, tuż przy strefie szuwarowej. Przedstawiono zagrożenia oraz wskazania ochronne dla tych stanowisk

The paper presents two new sites of Nasturtium microphyllum (Boenn.) Rchb. in Poland: in the Great Ditch in Zieleniewo, close to Kołobrzeg (the Baltic Sea Coast ) and in the Obra Leniwa Canal, in Babimost (Wielkopolska). The populations found were rich in flowering and fruiting individuals, which formed thick patches floating on the water surface by the rushes. The described species growth in both locations in the Nasturtietum microphylli association. Floods, water pollution, maintenance of the river banks and the river bed, or succession could constitute the greatest threats to the species populations. In order to preserve the described populations, small patches of Nasturtium microphyllum should be transferred to a temporary reservoir for the duration of the ditch and canal maintenance, and placed back thereafter. The right side of the Great Ditch (in the direction of Kołobrzeg) in Zieleniewo near Kołobrzeg and the 500 m long fragment of the Obra Leniwa Canal in Babimost should be protected as a site of ecological interest in order to preserve one of the rarest species in the flora of Poland