Peculiarities of the structure of zooplankton communities in floodplain water bodies of the Middle Ob

Abstract

The zooplankton of the caught floodplain lakes of the Middle Ob, located at various distances from the main riverbeds, was studied. It is shown that the development of the summer complex of zooplankton in floodplain lakes begins simultaneously with the passage of the flood; a significant diversity of species and the largest biomass increase in them in the summer months. The more often the floodplain lakes is filled with hollow waters, the higher the species diversity and the calculated indicators of plankton are in it. The factors that register the signs of zooplankton development in the caught lakes are revealed: the frequency of flooding, water temperature, the content of consumption for a number of taxa — the gas regime. Studies have shown that that the zooplankton of the caught reservoirs is subject to increased impact of the communities of the special territory of rivers and lakes of the above-floodplain terrace of the distribution of faunal diversity, increased species richness and specific species structure.