NATURAL SCIENCES

Journal of fundamental
and
applied researches

Analysis of systematic structure of the flora of lower part of the Volga delta

2013. 2, pp. 20-28

Rusakova Yelena G.  - Ph.D. (Biology), Associate Professor, Astrakhan State University, 1 Shaumyan Sq., Astrakhan, 414000, Russian Federation, elenarusakova@rambler.ru

Chunaeva Yulia V.  - student, Astrakhan State University, 1 Shaumyan Sq., Astrakhan, 414000, Russian Federation, estnauki2009@rambler.ru

The Lower part of the Volga delta is a young district dynamically developing under the influence of flow of the river Volga and the Caspian Sea level fluctuations. Flora of this territory has 469 species of vascular plants belonging to the 3 divisions, 71 families and 239 genera. The vast majority of species are angiosperms of which Dicotyledons are 68.9 %, Monocotyledones are 30.3 %. The share of spore-vascular plants in the flora is insignificant (0.9 %). The top ten families contain 60.6% of the flora. The families, including one genus are 60.6 % and monospecific are 31 %. Seven genera have the greatest diversity of species. Genera of hygrophilous and hydrophilic groups are dominated (Typha, Potamogeton, Carex, Polygonum, Schoenoplectus). Large species richness these genera is due to highly water-cut area.

Key words: flora,the systematic structure,the Volga delta,Astrakhan region,avandelta,leading family,coefficient of species richness,species diversity,genus,species

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