NATURAL SCIENCES

Journal of fundamental
and
applied researches

The influence of abiotic and anthropogenic factors on earth-worm population in flood soils in the Valley downstream of the Volga river

2013. №2, pp. 62-68

Koshmanova Tatyana A.  - post-graduate student, Astrakhan State University, 1Shaumyan Sq., Astrakhan, 414056, Russian Federation, tatyana_koshmanо@mail.ru

Lozovskaya Marina V.  - Doctor of Biological Sciences, Proffesor, Astrakhan State University, 1Shaumyan Sq., Astrakhan, 414056, Russian Federation, loza65@mail.ru

The studies were conducted at the fixed sites, embedded with the large typological categories: understand riverbed shaft, the central unit and terraced part of the floodplain. Four species of earth-worms Eisenia nordenskioldi (Eisen, 1879), Eisenia uralensis (Malevi?, 1950), Lumbricus rubellus (Hoffmaister, 1843), Aporrectodea rosea (Savigny, 1826) were discovered in flood soils in the valley downstream of the Volga River. Eisenia nordenskioldi dominated greatly in all samples. The number of earth-worms in the specimen area and their spatial distribution are closely connected with the abiatic factors (the temperature of the environment and the soil, the soil composition, moisture, etc.) and human factors (early flood and the volume of water discharged. Earthworms can survive changing conditions of the environment, drought and floods. Lyumbritsid spatial distribution in different the seasons- is a rate of the organism reaction to the change of the environment.

Key words: spatial distribution,population,climate factors,seasonal dynamics,the index of aggregation,drought,flooding,floodplain soil,earthworms