In 2013–2014, the presence of floating watermoss Salvinia natans (L.) All. was analysed in the lower Pilica river valley (Mazovian Lowland, Central Poland, Białobrzegi-Mniszew river section). We inspected 81 water reservoirs and 28 km of the riverbed. The plant was found at 27 sites in the ATPOL fields no. ED68, ED86 and ED87, mainly in oxbow lakes (51.9% of the sites), less frequently in the
... [Show full abstract] riverbed (29.6%) and in ponds (18.5%).