There is distribution data (1305 localities) about 350 species of vascular plants, mosses, fungi, insect, fish and birds in the lower part of the Desna River basin, namely along the river from Chernihiv to Kyiv and along the Oster River from Nizhyn to Oster. The most information is concerning of alien species like Ambrosia artemisiifolia L., Erigeron canadensis L., Amorpha fruticosa L. etc., as well as common species like Quercus robur L., Populus alba L., Salix acutifolia Willd. etc. However there is some data about distribution rare species too which are listed in the Red Data Book of Ukraine (2009).