Short Communication: Zooplankton as indicator of trophic status of lakes in Ilmen State Reserve, Russia

Abstract

Abstract. Mashkova IV, Kostryukova AM, Shchelkanova EE, Trofimenko VV. 2021. Short Communication: Zooplankton as indicator of trophic status of lakes in Ilmen State Reserve, Russia. Biodiversitas 22: 1448-1455. Zooplankton is a potentially powerful tool for assessing the trophic state of aquatic ecosystems. The current paper studied taxonomic composition and biomass of zooplankton communities in ten lakes within Ilmen State Reserve, Chelyabinsk region, Russia and identified the influence of trophic status on its formation. Integrated samples were taken from epilimnion in the summer of 2016-2019. Several criteria were used to determine trophic status: the taxonomic structure and biomass of zooplankton; some hydroecological indicators some hydroecological indicators and the Carlson index. The trophic status of the studied lakes, determined based on the zooplankton biomass, revealed that most of the lakes were in the status of mesotrophic. The number of zooplankton species in the lakes was 44 with Pleuroxus laevis, Bosmina longirostris, Simocephalus vetulus were the most numerous species in mesotrophic lakes; while Chaetonotus ploenensis, Keratella quadrata frenzeli, Leptodora kindti are rare. Zooplankton communities of Bolshoye Miassovo and Maloye Miassovo Lakes were characterized by high species diversity and considered as one of the most significant among the foothill lakes of the eastern slope of South Ural. The study reveals that hydroecological assessment of the ecological status is not exactly precise, as values are not stable and can change not only under the anthropogenic influence but also due to many natural abiotic environmental factors. The research shows that species composition and biomass of zooplankton communities could provide a more accurate assessment of the trophic status of water-bodies.

[RETRACTED] Short-term dynamics and growth parameters of cyanobacteria and microcystins in freshwater from the Sidi-Yacoub dam, North-east of Algeria

“…These water parameters indicate, according to Carlson and Simpson (1996) an eutrophic state of water dam with a tendency for cyanobacteria species to dominate the water environment, particularly the genus Microcystis, which recorded the highest biomass among all the species of cyanobacteria observed in the Sidi Yakoub dam. The many human activities applied to the waters of the Sidi-Yakoub dam has a negative impact on its quality, exerts a notable influence on the progression of phytoplankton communities (Setyono and Himawan 2018;Namsaraev et al 2020 ;Mashkova et al 2021) and can even cause eutrophication, a natural phenomenon accelerated by human activity, impacts numerous aquatic ecosystems worldwide and is recognized as a global concern (Ansari and Gill 2014;Ismest'eva et al 2015;Viaroli et al 2015;Gao et al 2020;Pratiwi et al 2020;Kostryukova et al 2021), leading to increase in production of phytoplankton biomass (Kostryukova et al 2018) and its community structure (Schuster et al 2015;Sharma et al 2016;Suda et al 2016;Li et al 2018;Pratiwi et al 2018;Song et al 2019;Wang et al 2020;Yang et al 2020;Manamani and Bensouilah 2023), oxygen depletion, reduced light penetration and extensive deterioration of water quality (Rao et al 2018).…”