Publications by authors named "Egor Zadereev"
The widespread salinisation of freshwater ecosystems poses a major threat to the biodiversity, functioning, and services that they provide. Human activities promote freshwater salinisation through multiple drivers (e.g.
View Article and Find Full Text PDFArticle Synopsis
- Climate change has altered the thermal structure of lakes, impacting both surface and deep water temperatures, though surface changes are more documented than deepwater trends.
- This study presents a comprehensive dataset of vertical temperature profiles from 153 lakes, starting from as early as 1894, allowing for a deeper analysis of long-term trends.
- The researchers also collected various geographic and water quality data to understand how different factors influence the thermal structures of these lakes amid ongoing environmental changes.
Article Synopsis
- Global lake surface water temperatures have warmed at an average rate of +0.37 °C per decade, while deepwater temperatures have shown minimal average change (+0.06 °C per decade), but with high variability among individual lakes.
- The study analyzed long-term vertical temperature data from 1970-2009 to uncover trends and influences on lake thermal structures.
- The variability in deepwater temperature trends is not fully explained by surface temperatures or internal lake factors, suggesting that broader climate patterns or human activities play a significant role in these long-term changes.
High Resistance of Resting Eggs of Cladoceran Moina macrocopa to the Effect of Heavy Metals.
Bull Environ Contam Toxicol
March 2019
The research aimed to determine critical concentrations of heavy metals at which survival of resting eggs of the cladoceran Moina macrocopa is negatively affected. Resting eggs' viability was not affected over a 30-days exposure towards copper, cadmium, zinc or nickel at concentrations up to 60-70 g/L. When resting eggs were exposed to sediment contaminated with heavy metals for 8 months, the hatching success was affected at 30 g copper/kg.
View Article and Find Full Text PDFArticle Synopsis
- The study investigated how heat shock protein HSP70, lipid peroxidation, and lactate dehydrogenase activity responded to rising temperatures in the amphipod species Sars from Lake Shira.
- A gradual temperature increase from 7 °C to 33 °C over 26 hours led to decreased lactate dehydrogenase activity and increased lipid peroxidation, while HSP70 levels remained stable.
- The findings suggested that the species' increased thermotolerance is linked to energy metabolism differences, which may provide resilience amidst global climate change, indicating potential biomarkers for aquatic stress in temperature-variable habitats.
We investigated the effects of γ-radiation on the survival of resting eggs of the cladoceran Moina macrocopa, on the parameters of the life cycle of neonates hatched from the irradiated eggs and on the performance of the population initiated from irradiated eggs. The study showed that γ-radiation in a range of doses from the background level to 100 Gy had no effect on survival of irradiated eggs. The absorbed dose of 200 Gy was lethal to resting eggs of M.
View Article and Find Full Text PDFTemperature and salinity are important abiotic factors for aquatic invertebrates. We investigated the influence of different salinity regimes on thermotolerance, energy metabolism and cellular stress defense mechanisms in amphipods Sars from two populations. We exposed amphipods to different thermal scenarios and determined their survival as well as activity of major antioxidant enzymes (peroxidase, catalase, glutathione S-transferase) and parameters of energy metabolism (content of glucose, glycogen, ATP, ADP, AMP and lactate).
View Article and Find Full Text PDF