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Abstract

The Shardara reservoir is located in southernmost Kazakhstan, in the zone of intensive farming and industrial development. Zooplankton and basic parameters of the environment have been studied in the summer of 2015. Zooplankton was represented by 60 species. The average abundance of the community amounted to 92.9 thous. specimens m -3 , with biomass of 966.0 mg m -3 . Copepods and rotifers dominated. The Shannon index values were equal to 2.24 bit specimen -1 and 1.23 bit mg -1 . The average individual mass of a specimen reached 0.0082 mg. Nonparametric and multivariate analysis of the data showed that macrophytes, nitrates, total nitrogen, organic polyphosphates, and copper favorably influenced Rotifera. Possible reasons for a positive relationship between quantitative indicators of Cladocera and zinc content are discussed. The main negative factors for Copepoda were organic polyphosphates, nitrites, total nitrogen, cadmium, and lead. Decrease in the Shannon index values under the influence of cadmium, ammonium, HCCH isomers is associated with increased dominance of Acanthocyclops trajani in the contaminated areas. There was no significant impact of heavy metals and pesticides on most of the structural indicators of zooplankton which can be due to the complex nature of contamination of the reservoir.

Assessment of Changes in the Structure of Zooplankton Communities to Infer Water Quality of the Caspian Sea

“…The predominantly negative relationships between the Shannon Bi index and an average individual mass of a specimen indicated that zooplankton communities with small-sized species were more diverse than communities with large-sized species. These results were consistent with previously obtained data on negative relationships between an average individual mass of a specimen or an average cell volume and the diversity of phytoplankton communities [30] and zooplankton [25,26].…”

“…Correlation analysis showed that there is a statistically significant strong positive relationship between ∆-Shannon and W-statistics of Clark (Table 8), which we recorded earlier in the study of plankton communities of various water bodies of Kazakhstan [23][24][25][26]. This close relationship is explained by the fact that the calculation of both variables is based on the same principles-the ratio of species in terms of abundance and biomass.…”

“…Zooplankton studies of the Northeastern Caspian were carried out in the spring (20)(21)(22)(23)(24)(25)(26)(27)(28) and summer (18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29) of 2010, and the Northern and Middle Caspian-in the spring (from 25 May to 2 June) and summer (15-26 August) of 2008 ( Figure 1). Zooplankton samples were collected using the Juday net with the inlet diameter of 12 cm with the sieve-size of 64 µm, by double pulling it through from bottom to surface.…”

Tracking pollution and its sources in the catchment‐lake system of major waterbodies in Kazakhstan

“…Statistical maps were used in earlier environmental studies Krupa, Barinova, Amirgaliyev, et al, 2017b;Krupa, Barinova, Assylbekova, et al, 2018c;Krupa, Barinova, Isbekov, et al, 2018a;Krupa, Barinova, Ponamareva, et al, 2018b;Krupa, Barinova, Tsoy, et al, 2017a). Within the framework of the present study, however, overlaying of statistical maps on the contours of waterbodies for the first time made data visualization easier for analysis purposes, compared to previous methods.…”

Metagenome Analysis of Surface Waters of the Shardara Reservoir, the Largest Artificial Reservoir in Southern Kazakhstan

“…T he Shardara reservoir is the largest artificial reservoir in Southern Kazakhstan, created to meet irrigation and hydropower needs by regulating the runoff of the Syr Darya River. The Shardara reservoir is one of the largest fisheries in Kazakhstan; therefore, the study of the diversity of its microbiome, phytoplankton, and zooplankton is one of the significant tasks of ecological monitoring in the region (1,2).…”