Spatial Distribution of Zooplankton on the Upper Part of the Cheboksary Reservoir

Zooplankton Communities of the Middle River Part of the Cheboksary Reservoir and Factors Influencing Their Species Structure

“…Zooplankton species were considered as dominant according to Kownacki index (Bakanov, 1987). Multivariate vector analysis was applied to classification if zooplankton samples (Shurganova et al, 2003;Shurganova, 2007). It is a version of hierarchical cluster analysis based on angle (cosine) between samples in multivariate abundance space as a measure of their dissimilarity.…”

“…There is a great interest in the problem of identification of spatial distribution of zooplankton communities and assembly of their species structure under the impact of various natural and anthropogenic factors (Leitao et al, 2006;Sokolova, 2012;Bolotov et al, 2013;Lazareva, Sokolova, 2015;Presnova, Khulapova, 2015;Joniak, Kuczynska-Kippen, 2016;Shurganova et al, 2018). The creation of reservoirs in the river beds transforms the original river ecosystem into a lentic ecosystem (Simões et al, 2015) and modifies the functioning of hydrobiocenoses.…”

“…Cheboksary Reservoir is formed by two streams coming from the Gorky Reservoir and Oka River. These water masses differ from each other considerably in physical and chemical properties (Shurganova, 2007;Shurganova et al, 2018). Studies of the zooplankton of the Cheboksary Reservoir have been conducted since its construction (Kuznecova et al, 1991;Shurganova et al, 2003Shurganova et al, , 2014Shurganova et al, , 2018Shurganova, 2007;Shurganova, Cherepennikov, 2010).…”

“…These water masses differ from each other considerably in physical and chemical properties (Shurganova, 2007;Shurganova et al, 2018). Studies of the zooplankton of the Cheboksary Reservoir have been conducted since its construction (Kuznecova et al, 1991;Shurganova et al, 2003Shurganova et al, , 2014Shurganova et al, , 2018Shurganova, 2007;Shurganova, Cherepennikov, 2010). However, the current spatial distribution and species structure of zooplankton communities in the middle river part of the Cheboksary Reservoir requires additional investigation because zooplankton communities change their structure and boundaries during succession (Shurganova, 2007).…”

Biodiversity of zooplankton (Rotifera, Cladocera and Copepoda) in the tributaries of Cheboksary Reservoir (Middle Volga, Russia)

“…In recent decades, the increasing anthropogenic impact on aquatic ecosystems has resulted in accelerated pollution, eutrophication and, as a consequence, changes in the biodiversity of aquatic communities ( Loreau et al 2001 , Naeem et al 2012 , Zhikharev et al 2023b ). Planktonic crustaceans and rotifers are sensitive to eutrophication of aquatic ecosystems and could change species diversity and spatial distribution of communities ( Shurganova et al 2018 , Afonina and Tashlykova 2020 , Krupa et al 2020 , Liang et al 2020 , Waite et al 2020 , Zhikharev et al 2021 ). The invasion of alien species into water bodies poses a particular threat to biodiversity.…”