ANALYSIS OF THE ADVENTIVE COMPONENT OF THE FLORA OF THE ASTRAKHAN BIOSPHERE RESERVE

Afanasyev Vladimir Evgenievich  -  PhD (Biology), Astrakhan State Technical University, Russia, 414056, Astrakhan, st. Tatishcheva, 16, ma-linka@bk.ru

The adventive component of the flora of the Astrakhan Biosphere Reserve includes 44 species of vascular plants and makes up 9.9% of the total number of species of this flora. By the time of introduction, 42 species are kenophytes, and only two are ancient weeds - archaeophytes. By the way of immigration, the majority of adventive plants (27 species or 61.4% of their total number) are xenophytes, unintentionally introduced species. By the degree of naturalization, epecophytes (17 species) and agriophytes (16 species) predominate; thus, the stable component of the adventive fraction is 75%. The most actively transforming the ecosystems of the reserve are several agriophytes - Fraxinus pennsylvanica, Zizania latifolia and Amorpha fruticosa. 20 adventive species from North America, five species from the Mediterranean, one cultural and one Asian-North American origin. The rest of the species come from various regions of Asia.

Key words: PAs, Astrakhan Nature Reserve, adventive plants, plant invasions, Volga delta, anthropogenic transformation of flora, transformer species, biodiversity