Phytoplankton and Its Role in Accumulation of Microelements in Bottom Deposits of Azov Sea

Abstract

The importance of phytoplankton is high in transformation of substances in aquatic ecosystems and in formation of suspension’s material structure. Its main functions are consumption of the dissolved biogenic components and chemical elements and their conversion to a firm phase. The article is devoted to the bioaccumulation of microelements by phytoplankton in the ecosystem of the Azov Sea. The fact that the algal biomass during the periods of blooming in the sea reaches 1,400 g/l makes this study especially urgent. The authors define the rates of biogeochemical cycle and the intensity of chemical elements’ consumption and also investigate the role of phytoplankton in the formation chemical peculiarities of bottom deposits and its involvement in sedimentogenesis in the Azov Sea. The cause of the reduced trace element content in bottom deposits relatively to suspended material is established. It is noted that the amount of some elements annually consumed by algae of the Azov Sea is up to 75% from their maximum delivery by terrigenous material.

Bioremediation Performance of Marine Sponge Symbiont Bacteria against Nickel and Mercury Heavy Metal Pollutants

“…Table 3 shows that the bioremediation performance of AF and AC bacteria against nickel and mercury ion test pollutants, based on adsorption data, shows that the bioremediation of AF bacteria against Ni +2 pollutants on average (167.64±0.9 mg/L) is equivalent to an average remediation efficiency of 66.85%, and an average Hg +2 pollutant of 163.69±0.7 or equivalent to an efficiency of 65.47%. The average bioremediation performance of AC bacteria against Ni +2 pollutants reached 168.92±0.7 or equivalent to an average efficiency of 66.97%, while the average bioremediation performance against Hg +2 pollutants was 145.87±0.8, equivalent to the percentage of bioremediation efficiency reaching 58.35% [60], [65].…”

Trophic transfer of copper decreases the condition index in Crassostrea gigas spat in concomitance with a change in the microalgal fatty acid profile and enhanced oyster energy demand

“…A heatmap (Figure 8) of these genes highlights patterns of expression, namely overexpression in the Cu15/Cu50 groups compared with the control group on days 14 and 21, particularly for genes involved in the stress response, DNA repair, glycogen catabolism and FA metabolism. A boxplot of and 93 mg kg -1 d.w. in total phytoplankton (Dotsenko and Mikhailenko, 2019), and to a lesser extent in the Daya Bay (South China), with a lower average concentration of 8.9 mg kg -1 d.w. (Qiu, 2015). From these figures, we can consider oyster spat to be fed, in the present study, with phytoplankton presenting a Cu load relevant from the environmental point of view.…”

Reciprocal Effects of Metal Mixtures on Phytoplankton

“…Furthermore, phytoplankton are easily and economically culturable and show rapid growth and cellular turnover with high sensitivity levels for various pollutants. Phytoplankton are being used as bioindicators for heavy metal toxicity studies in aquatic ecosystems, providing valuable results and insights [12].…”