Status of the zooplankton in the central Syvash Bay in the summer season of 2019

The Syvash Bay is located in the Western Azov Sea and is separated from it by the Arabat Spit. After the channel was shut off in 2014, the water salinity in the bay gradually increased, which leads to the changes in the Syvash biota. During the desalinization period, the bay served as an important spawning and feeding ground for the juveniles of the Azov Sea fish species that mainly feed on zooplankton. The increase in salinity has inevitably influenced its state. It is shown that the highest indices of zooplankton development have been recorded in the northern part, the most desalinated one, and the lowest values have been observed in the southern part, characterized by the highest salinity. That said, in the northern part of the bay, zooplankton abundance was 1.2–1.4 and biomass was 2.7–2.9 times lower in July than in June. At the same time, in the southern part of the bay, characterized by the highest salinity, the average abundance of zooplankton in July was 2.1–4.4 times lower as compared to June, and for zooplankton biomass, this value was 1.5–4.1 times lower. Furthermore, rotifers and isopods were virtually absent in this area, and no nematodes and flatworms were recorded. The study has shown that, as the result of the further salinization, the Syvash Bay has the possibility to become a hypersaline water body again. In this case, the species richness of zooplankton will deteriorate considerably, and ultrasaline species will be prevalent in its species composition. This work was aimed at the investigation of the status of the zooplanktonic community in the summer season (June–July) of 2019.

Bibliographic Details

Main Authors:	Terentyev, A.S., Zaremba, N.B.
Format:	Journal Contribution biblioteca
Language:	Russian
Published:	2021
Subjects:	Copepods, Salinization, Species composition, Abundance, Ultrasaline species, Biomass, Копеподы, Осолонение, Видовой состав, Ультрагалинные виды, Биомасса, ASFA_2015::Y::Zooplankton, ASFA_2015::E::Eutrophication, ASFA_2015::S::Salt lakes,
Online Access:	http://hdl.handle.net/1834/41892
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