The Level of Ecological and Hydrobiological Indicators in the Cheboksary Reservoir

Andrey Vladimirovich Kozlov,Nadezhda Vasilevna Polyakova,Nataliya Nikolaevna Koposova,Anna Vladimirovna Matveeva,Irina Pavlovna Uromova,Elena Aleksandrovna Krotova

doi:10.13189/eer.2021.090504

Abstract

The paper assesses the ecological state of the Cheboksary reservoir based on the criteria of the total abundance, biomass, and species diversity of phytoplankton, zooplankton, and benthos. During the study period, no significant changes in the indicators of the development of algocenoses, their distribution over the water area of the reservoir were noted. The average phytoplankton biomass for the reservoir turned out to be in the dynamic norm, the trophic status was assessed as eutrophic; The revealed ratios of the leading systematic groups of planktonic algae and the composition of cenosis-forming species had also been in the previous years of the study. According to the level of the saprobity index, all sampling stations belong to class III (moderately polluted waters). The benthos of the reservoir was also characterized by sufficient diversity with the dominance of mollusks and chironomid larvae in the taxonomic composition. Thus, despite the presence of a certain anthropogenic impact on the water area of the Cheboksary reservoir, its hydrobiological state remains satisfactory, which is determined by a wide buffer limit to the level of pollution of the water body.

Highlights

Due to the uneven location of rivers, lakes, and other hydrological objects on the Earth's surface, artificial reservoirs have become a common planetary phenomenon
We studied the hydrobiological characteristics of the water area of the Cheboksary reservoir as criteria for assessing its ecological state
The average phytoplankton biomass for the reservoir in 2015 was 5.61±0.35 g/m3, the trophic status was assessed as eutrophic; the ratio of the leading systematic groups of planktonic algae and the composition of cenosis-forming species had been in the previous years of the study

Summary

Introduction

Due to the uneven location of rivers, lakes, and other hydrological objects on the Earth's surface, artificial reservoirs have become a common planetary phenomenon. These include various ponds, canals, reservoirs, filtration reservoirs, and other objects that have any unique economic and/or biospheric importance. The reservoir, as an artificially created water body, has a strategically significant function in the national economic sectors and the ecological biosphere plan [1]. In addition to reducing direct damage from them, the costs of construction and reconstruction of capital objects in various sectors of the economy are reduced due to the reduction of flood control costs. Initiatives are taken to acclimatize such valuable fish species as silver carp, grass carp, rainbow trout, and others in this kind of water body

Methods

Results

Conclusion