Weed species in synantropic flora of Novi Sad.

Ruderal or syntrophic flora and vegetation are the most dynamic floristic-vegetation complex and an integral part of antropogenic environment. On one side the influence of antropogenic factors and on the other a variety of climate, topografic, geological and soil characteristics contribute to highly pronounced diversity of a weed flora. The presence of antropogenic influences have crucial importance of the emergence, development and distribution of ruderal flora and ruderal vegetation making the biotops very dynamic and unstable habitats. Horticulture has a long tradition in the city of Novi Sada which is located in the region of intensive agricultural production as a port center with international transport links and consequently is the most exposed to the introduction of new species. According to the existing data Novi Sad has the largest number of invasive species (59,7%) in Vojvodina, which indicates a need to produce a syntrophic inventory of its flora in order to list both native and introduced species. Phytogeographical analysis has been performed on syntrophic flora whith special emphasis on the analysis of the origin of introduced plant species. Furthermore, the range of life forms that indicates the caracter of antropogenically altered phytocenosis has been determined.