Архив метки: hypersaline lakes

PECULIARITIES OF THE ANNUAL AND SEASONAL DYNAMICS OF THE ECOLOGICAL STATE OF THE SALINE LAKES LOCATED IN ARID CLIMATE IN CRIMEA

Arid Ecosystems

UDC 577.115.3+577.359

Rudneva I.I., Shaida V.G., Scherba А.V. PECULIARITIES OF THE ANNUAL AND SEASONAL DYNAMICS OF THE ECOLOGICAL STATE OF THE SALINE LAKES LOCATED IN ARID CLIMATE IN CRIMEA // Arid ecosystems. 2022. V.28. № 3 (92). P. 117-125. | PDF

On Crimea peninsula there are several unique lakes of different genesis, which characterize high quality recreational and balneological properties. These water bodies are impacted for anthropogenic activities, caused negative consequences for the  total ecosystem, including the lost of biological and hydromineralogical resources. At several cases, the water bodies located not far from each other greatly differ because of anthropogenic activity. For instance, Moinaky Lake is located at the west part of the Eupatoria city (Crimea), at present it is divided by the sand barrier in two parts namely Moinaky 1 (big part) and Moinaky 2 (small part). The aim of the present work was to study several physical and chemical characteristics of the water ( temperature, pH, Eh, salinity, oxygen  content) in both basins and the population state of brine shrimp Artemia salina at the period of 2018-2020. We studied the hydrochemical parameters of the water namely temperature, рН, oxygen concentration, salinity and Eh) monthly in both water bodies, divided by sand barrier. Seasonal dynamics of the tested parameters was characterized by the increase of salinity and Eh in summer period, accompanied with the increasing temperature of the air and water caused high insolation. Simultaneously, the concentration of the oxygen dropped and the insignificant decrease of pH was observed. The differences between the tested processes in both water bodies were shown, which were more clearly in Moinaky 2 as compared with Moinaky 1. Artemia cysts were found in both basins, while nauplia and adults were found only in Moinaky 2 at autumn and winter 2020, after dry period and restoration of the hydrological regime.

Keywords: hypersaline lakes, Crimea Peninsula, pH, Eh, salinity, oxygen content.

Financing. The work was carried out on the topic of the state assignment of the Moscow Hydrophysical Institute of the Russian Academy of Sciences 0555-2021-0004 «Fundamental research of oceanological processes that determine the state and evolution of the marine environment under the influence of natural and anthropogenic factors, based on observation and modeling methods» (cipher «Oceanological processes»).

DOI: 10.24412/1993-3916-2022-3-117-125

 

CLIMATE EFFECTS ON THE ANNUAL AND SEASONAL DYNAMICS OF ECOLOGICAL STATE OF THE SALT LAKE ADJY-BAICHY (CRIMEA)

Arid Ecosystems

Rudneva I.I., Shaida V.G., Scherba А.V., Zav’aylov A.V. CLIMATE EFFECTS ON THE ANNUAL AND SEASONAL DYNAMICS OF ECOLOGICAL STATE OF THE SALT LAKE ADJY-BAICHY (CRIMEA) // Arid ecosystems. 2021. V.27. № 4 (88). P. 133-142. | PDF

Ecological state of the indoor water bodies, including hypersaline lakes are determined by the influence of the complex of the natural and anthropogenic factors. The aim of the present work was the annual and seasonal study of the monitoring of the hyprsaline lake Adjy-Baichy, which is located on the western part of Crimean Peninsula at the arid area. The fluctuations of the air and water temperature, hydrochemical parameters of the brine and Artemia salina population at the period of 2017-2020 were investigated. The common tendencies, characterized the air and water temperature increase in summer period, the highest values were found in July-September (<+30⁰ С), which was accompanied with the elevation of salinity and decrease of oxygen concentration. 

Variations of pH and Eh were lower. The greatest salinity of the brine (< 350 ‰) was observed in 2017, the lowest value of oxygen concentration (0.7-1.0 мг/л,) was identified in 2020 and Eh (-78.5 мВ) were shown in 2019. Artemia cysts were found in all tested periods due the year, nauplii were found in March-April at water temperature +3+7⁰ С, the adults were caught in summer months and at the beginning of the autumn. In summer time at the high water temperature and low oxygen concentration the dead adults were found. The obtained results reflet the peculiarities of the effect of climate factors on the ecosystem of the hypersaline lake and they may be use as a model for the prediction of possible scenario of consequences of climate changes on the indoor water bodies and be useful for the understanding of the processes of transformation of aquatic ecosystems in arid areas and for the development of the programs for their protection and optimal management of their resources.

Keywords: hypersaline lakes, Crimea, seasonal fluctuations, temperature, hydrochemical characteristics, Artemia, drying out.

Financing. The work was carried out on the topic of the state task of the FGBUN IMBI «Functional, metabolic and toxicological aspects of the existence of hydrobionts and their populations in biotopes with different physico-chemical regime», state number. Registration AAAAA-A18-118021490093-4.

DOI: 10.24412/1993-3916-2021-4-133-142