АНАЛИЗ ВЗАИМОДЕЙСТВИЯ ПЛАНКТОННЫХ И ДОННЫХ СООБЩЕСТВ В СОЛЕНЫХ РЕКАХ ПРИЭЛЬТОНЬЯ (РОССИЯ)

Abstract

The results of the analysis of studies of saine rivers of the arid region of the Elton region (the area of the Caspian lowland, the basin of the hyperhaline Lake Elton) based on the study of plankton and bottom communities in August 2013 and 2018 are presented. For multidimensional statistical analysis, we used the results of processing hydrobiological samples taken at 13 stations of five saline rivers. A matrix of the numbers of 136 species and taxa, representatives of zooplankton, macrozoobenthos and meiobenthos was formed. To process the data, the values of the numerical matrices were transformed into a single score scale from 0 to 6 using the algorithm for finding optimal boundaries. The stations were grouped according to the level of water mineralization:1 – >25 g/l, 2 – 10-25 g/l and 3 – <10 g/l.The use of statistical models of species distribution in the space of abiotic factors madeit possible to establish that the heterogeneity of the diversity of planktonic and bottom communities is due to biotopic differences and the level of mineralization of water masses. It is shown that for highly mineralized hydrosystems of arid regions, a clear separation of the life forms of plankton and bottom communities is not obvious.