Effects of aquatic heavy metal intoxication on the level of hematocrit and hemoglobin in fishes: A review DOI Creative Commons
Imtiaz Ahmed,

Archo Zakiya,

Francesco Fazio

et al.

Frontiers in Environmental Science, Journal Year: 2022, Volume and Issue: 10

Published: Sept. 13, 2022

Environmental pollution caused due to the presence of heavy metals has become a great concern as it an adverse effect on almost all types ecosystem. In this sense, these pollutants have tendency pollute aquatic ecosystem, thus badly affecting health organisms. As result, toxicological studies believe them be most harmful in environment. Among organisms, fish—being chief organism system—become easiest victim pollutants. Heavy enter fish bodies through alimentary system by consumption polluted food, or gills, and skin. They are finally delivered bloodstream organs tissues where they accumulate after absorption. Ultimately, way make their into humans food chain. The fluctuations hematological values may serve initial indicator toxicant’s impact health. It been observed that when quality medium, first consequence is apparent form physiological changes fish, which reflected one more parameters, such hemoglobin, hematocrit, red blood cell count, white etc. result alterations, weak, anemic, susceptible diseases. Over past several decades, vast number reported qualitative quantitative variations parameters metal intoxication. contamination water resources not only degrades but also negatively impacts proteins. Therefore, article sheds light effects hemoglobin hematocrit hematology calls for attention protection preservation ecosystems, particularly those contaminated with metals.

Language: Английский

How humans alter dissolved organic matter composition in freshwater: relevance for the Earth’s biogeochemistry DOI Creative Commons
Marguerite A. Xenopoulos, Rebecca T. Barnes, Kyle Boodoo

et al.

Biogeochemistry, Journal Year: 2021, Volume and Issue: 154(2), P. 323 - 348

Published: Jan. 25, 2021

Abstract Dissolved organic matter (DOM) is recognized for its importance in freshwater ecosystems, but historical reliance on DOM quantity rather than indicators of composition has led to an incomplete understanding and underestimation role biogeochemical processes. A single sample can be composed tens thousands distinct molecules. Each these unique molecules their own chemical properties reactivity or the environment. Human activities modify recent research uncovered pools laced with human markers footprints. Here we review how land use change, climate nutrient pollution, browning, wildfires, dams change which turn will affect internal processing DOM. We then describe human-modified Drought, cultivated use, eutrophication, driven permafrost thaw, other stressors shift ecosystems increasing relative contribution microbial-like aliphatic components. In contrast, increases precipitation may towards more relatively humic-rich, allochthonous forms These shifts likely have highly contrasting effects carbon outgassing burial, cycles, ecosystem metabolism, metal toxicity, treatments needed produce clean drinking water. deeper links between dynamics help address important future environmental issues, such as transfer contaminants through food webs, alterations nitrogen cycling, impacts water quality, global change.

Language: Английский

Citations

157
Arctic mercury cycling DOI
Ashu Dastoor, Hélène Angot, Johannes Bieser

et al.

Nature Reviews Earth & Environment, Journal Year: 2022, Volume and Issue: 3(4), P. 270 - 286

Published: March 22, 2022

Language: Английский

Citations

113
Global change effects on biogeochemical mercury cycling DOI Creative Commons
Jeroen E. Sonke, Hélène Angot, Yanxu Zhang

et al.

AMBIO, Journal Year: 2023, Volume and Issue: 52(5), P. 853 - 876

Published: March 29, 2023

Abstract Past and present anthropogenic mercury (Hg) release to ecosystems causes neurotoxicity cardiovascular disease in humans with an estimated economic cost of $117 billion USD annually. Humans are primarily exposed Hg via the consumption contaminated freshwater marine fish. The UNEP Minamata Convention on aims curb environment is accompanied by global monitoring efforts track its success. biogeochemical cycle a complex cascade release, dispersal, transformation bio-uptake processes that link sources exposure. Global change interacts impacting physical, ecological factors control these processes. In this review we examine how such as biome shifts, deforestation, permafrost thaw or ocean stratification will alter cycling Based past declines environmental levels, expect future policy impacts should be distinguishable from effects at regional scales.

Language: Английский

Citations

73
Widespread microbial mercury methylation genes in the global ocean DOI
Émilie Villar, Léa Cabrol, Lars‐Éric Heimbürger‐Boavida

et al.

Environmental Microbiology Reports, Journal Year: 2020, Volume and Issue: 12(3), P. 277 - 287

Published: Feb. 24, 2020

Summary Methylmercury is a neurotoxin that bioaccumulates from seawater to high concentrations in marine fish, putting human and ecosystem health at risk. High methylmercury levels have been found the oxic subsurface waters of all oceans, but only anaerobic microorganisms shown efficiently produce anoxic environments. The microaerophilic nitrite‐oxidizing bacteria Nitrospina previously suggested as possible mercury methylating Antarctic sea ice. However, responsible for processing inorganic into remain unknown. Here, we show metagenomic metatranscriptomic evidence genetic potential microbial production widespread seawater. We find abundance expression key genes hgcAB across ocean basins, corresponding taxonomic relatives known Deltaproteobacteria , Firmicutes Chloroflexi . Our results identify predominant microorganism carrying actively expressing highest occurs global where MeHg are typically observed.

Language: Английский

Citations

102
Mercury cycling in freshwater systems - An updated conceptual model DOI
Brian A. Branfireun, Claudia Cosio, Alexandre J. Poulain

et al.

The Science of The Total Environment, Journal Year: 2020, Volume and Issue: 745, P. 140906 - 140906

Published: July 17, 2020

Language: Английский

Citations

90
Mercury biogeochemical cycling: A synthesis of recent scientific advances DOI
Mae Sexauer Gustin, Michael S. Bank, Kevin Bishop

et al.

The Science of The Total Environment, Journal Year: 2020, Volume and Issue: 737, P. 139619 - 139619

Published: May 23, 2020

Language: Английский

Citations

77
Mobilization, Methylation, and Demethylation of Mercury in a Paddy Soil Under Systematic Redox Changes DOI
Jianxu Wang, Sabry M. Shaheen,

Min Jing

et al.

Environmental Science & Technology, Journal Year: 2021, Volume and Issue: 55(14), P. 10133 - 10141

Published: July 2, 2021

Methylmercury (MeHg) contamination in paddy fields is a significant environmental issue globally since over half of the population our planet consumes rice. MeHg neurotoxin produced by microorganisms oxygen-limited environments. Microbial effect on production hotspot research; however, it has been largely ignored how oxidation–reduction potential (Eh) shapes formation. Here, we elucidated Hg (de)-methylation contaminated soil increasing Eh stepwise from −300 to +300 mV using sophisticated biogeochemical microcosm. At range −100 mV, high concentration and dissolved total (THg) were found due relative abundance Hg-methylation bacteria (e.g., Desulfitobacterium spp.), acidification, reductive dissolution Fe(oxyhydr)oxides. 0 +200 formation colloids leads adsorption as result colloidal increased. reduction with (−300 mV) increase was mainly attributed reduced methylation, THg spp. decreased 50 96%, respectively, at compared mV. Mercury demethylation might be less important (Clostridium spp.) also 93% These new results are crucial for predicting risks fields.

Language: Английский

Citations

62
Algal Organic Matter Drives Methanogen-Mediated Methylmercury Production in Water from Eutrophic Shallow Lakes DOI
Pei Lei, Jin Zhang,

Jinjie Zhu

et al.

Environmental Science & Technology, Journal Year: 2021, Volume and Issue: 55(15), P. 10811 - 10820

Published: July 8, 2021

Algal blooms bring massive amounts of algal organic matter (AOM) into eutrophic lakes, which influences microbial methylmercury (MeHg) production. However, because the complexity AOM and its dynamic changes during decomposition, relationship between Hg methylators remains poorly understood, hinders predicting MeHg production bioaccumulation in shallow lakes. To address that, we explored impacts on by characterizing dissolved with Fourier transform ion cyclotron resonance mass spectrometry (FTICR-MS) three-dimensional excitation-emission matrix (3D-EEM) fluorescence spectroscopy quantifying methylation gene hgcA. We first reveal that predominance methanogens, facilitated eutrophication-induced carbon input, could drive lake water. Specifically, bioavailable components (i.e., CHONs such as aromatic proteins soluble byproduct-like materials) increased abundances (Archaea-hgcA gene: 438–2240% higher) activities (net CH4 production: 16.0–44.4% Archaea (e.g., methanogens). These turn led to enhanced levels (24.3–15,918% for three major lakes China. Nevertheless, our model results indicate AOM-facilitated be offset AOM-induced biodilution under eutrophication. Our study would help reduce uncertainties production, providing a basis mitigating risk

Language: Английский

Citations

61
A synthesis of mercury research in the Southern Hemisphere, part 1: Natural processes DOI Creative Commons
Larissa Schneider, Jenny A. Fisher, María C. Diéguez

et al.

AMBIO, Journal Year: 2023, Volume and Issue: 52(5), P. 897 - 917

Published: March 21, 2023

Abstract Recent studies demonstrate a short 3–6-month atmospheric lifetime for mercury (Hg). This implies Hg emissions are predominantly deposited within the same hemisphere in which they emitted, thus placing increasing importance on considering sources, sinks and impacts from hemispheric perspective. In absence of comprehensive data Southern Hemisphere (SH), estimates inventories SH have been drawn collected NH, with assumption that NH broadly applicable. this paper, we centre uniqueness context natural biogeochemical cycling, focus midlatitudes tropics. Due to its uniqueness, Antarctica warrants an exclusive review contribution cycling is therefore excluded review. We identify describe five key differences between hemispheres affect Hg: biome heterogeneity, vegetation type, ocean area, methylation hotspot zones occurence volcanic activities. current state knowledge each difference, as well gaps impede our understanding SH. The limitations using infer processes

Language: Английский

Citations

32
Mercury and Sulfur Redox Cycling Affect Methylmercury Levels in Rice Paddy Soils across a Contamination Gradient DOI Creative Commons
Jiang Liu, Ji Chen, Alexandre J. Poulain

et al.

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(21), P. 8149 - 8160

Published: May 17, 2023

Methylmercury (MeHg) contamination in rice via paddy soils is an emerging global environmental issue. An understanding of mercury (Hg) transformation processes urgently needed order to control Hg human food and related health impacts. Sulfur (S)-regulated one important process that controls cycling agricultural fields. In this study, processes, such as methylation, demethylation, oxidation, reduction, their responses S input (sulfate thiosulfate) with a gradient were elucidated simultaneously using multi-compound-specific isotope labeling technique (200HgII, Me198Hg, 202Hg0). addition HgII methylation MeHg study revealed microbially mediated reduction HgII, Hg0, oxidative demethylation–reduction occurred under dark conditions; these served transform between different species (Hg0, MeHg) flooded soils. Rapid redox recycling contributed speciation resetting, which promoted the Hg0 by generating bioavailable for fuel methylation. also likely affected microbial community structure functional profile methylators and, therefore, influenced The findings contribute our provide much-needed knowledge assessing risks hydrological fluctuation-regulated ecosystems.

Language: Английский

Citations

28