Nightshade black - Solanum nigrum L. (Solanaceae) on saline habitats of the Southeast Europe
One of the negative florogenesis trends is the diversification of flora with alien species, which goes parallelly with insularization of natural vegetation cover. They alter the structure of ecosystems, reduce their productivity, threaten the diversity and genetic integrity of natural flora by integration into natural communities and competition with native flora species. One of alien species of Solanaceae Juss family is black nightshade (Solanum nigrum L.) - a poisonous species of Mediterranean origin, with a Eurasian secondary area; unintentionally introduced alien species (xenophyte), naturalizing in secondary habitats (epecophyte), mesophyte, heliophyte, zoochor, naturalizing predominantly in more or less disturbed vegetative communities of South-Eastern Europe. This species is also found on salted soils, where it is registered in the communities of associations Cichorio-Lactucetum serriolae Golub et Mirkin 1986, Atriplici aucheri-Tamaricetum ramosissimae Golub et al. 1998 (subassociations A.au.-T.r. althaeetosum Golub et al. 1998, A.au.-T.r. cannabietosum Golub et al. 1998), Polygono-Aeluropodetum pungentis Golub et Mirkin 1986 and Suaedo-Petrosimonietum Golub 1986 (variant Glycyrrhiza glabra). These associations can occur on soil with a wide range of salinization degree - both on soils with weak- and high- salinity - but Solanum nigrum does not have much difference in its presence in their communities depending on this factor. The species is characterized by a weak introduction in cenoses of saline habitats - it is rare and has low abundance level.