A review of metal contamination in seagrasses with an emphasis on metal kinetics and detoxification

Journal of Hazardous Materials, Год журнала: 2023, Номер 454, С. 131500 - 131500

Опубликована: Апрель 26, 2023

Seagrasses are important foundation species in coastal ecosystems, and they provide food habitat that supports high biodiversity. However, seagrasses increasingly subjected to anthropogenic disturbances such as metal pollution, which has been implicated a significant factor driving seagrass losses. There have several reviews synthesizing the concentrations evaluating their utility biomonitors for pollution environment at local scale. interpretation of data requires more mechanistic understanding processes governing bioaccumulation detoxification. In this review, progress trends studies between 1973 2022 were analyzed identify frontier topics field. addition, we tried (1) analyze assess current status contamination on global scale by incorporating from tropical Indo-Pacific seagrasses, (2) summarize geochemical biological factors uptake loss (3) an up-to-date metals' effects physiological responses challenges. This review improves our highly variable observed

Язык: Английский

---

Mercury contamination is an invisible threat to declining migratory shorebirds along the East Asian-Australasian Flyway

Communications Biology, Год журнала: 2024, Номер 7(1)

Опубликована: Май 16, 2024

Exposure to pollutants is a potentially crucial but overlooked driver of population declines in shorebirds along the East Asian-Australasian Flyway. We combined knowledge moult strategy and life history with standardised sampling protocol assess mercury (Hg) contamination 984 individuals across 33 migratory shorebird species on an intercontinental scale. Over one-third samples exceeded toxicity benchmarks. Feather Hg was best explained by moulting region, while habitat preference (coastal obligate vs. non-coastal obligate), proportion invertebrates diet foraging stratum (foraging mostly surface at depth) also contributed, were less pronounced. substantially higher South China (Mai Po Leizhou), Australia Yellow Sea than temperate Arctic breeding ranges. Non-coastal (Tringa genus) frequently encountered freshwater habitats highest risk. It important continue expand biomonitoring research how other might impact shorebirds.

Язык: Английский

---

Bioremediation of mercury contaminated soil and water: A review

Land Degradation and Development, Год журнала: 2023, Номер 35(4), С. 1261 - 1283

Опубликована: Ноя. 30, 2023

Abstract Mercury (Hg) pollution of soil and water environments is a major global threat to human health, agri‐food systems ecosystems industrial activities mainly coal combustion augmented their content in different environmental media. Bioremediation nature‐based solution involving microbial‐ plant‐based (phytoremediation) technologies that clean‐up Hg contaminated sites. Here, we review Hg‐resistant bacteria how latest insights our understanding the cellular biochemical mechanisms mer operon genes responsible for resistance transformation have facilitated developments microbial Hg‐bioremediation. We also phytoremediation mechanisms, including those bacterial‐ fungi‐assisted processes, which shown promising results reducing 2+ 0 . This provides detailed knowledge novel bioremediation methods. Consequently, phyto‐based critical role reclamation Hg‐contaminated protection health ecosystems.

Язык: Английский

---

Microbial Methylation of Mercury in Wetlands and Its Environmental Risks

IntechOpen eBooks, Год журнала: 2025, Номер unknown

Опубликована: Янв. 10, 2025

Global mercury contamination presents a substantial threat to ecosystems and human health, primarily due the conversion of inorganic from anthropogenic sources into methylmercury by microorganisms in environment. Wetlands are especially prone this transformation their anaerobic conditions, abundant organic matter, prevalence metal-reducing bacteria. This chapter explores mechanisms methylation subsequent diffusion accumulation organisms ecosystems, using case study Santa Lucia River wetlands Uruguay. In case, high concentrations were detected sediments over 15,000 square meter area, exceeding regulated limits. The was linked discharge untreated wastewater containing chlor-alkali plant. Although treatment system later installed, significant hotspots persisted wetlands. These areas contained both biota, including reeds, shellfish, earthworms, fish. Microbial analysis revealed presence Geobacter sulfurreducens metallireducens, bacteria known methylate mercury. existence these microbial communities poses serious risks at four levels public health ongoing situ methylation.

Язык: Английский

---

Management Strategies to Reduce Microbial Mercury Methylation in Constructed Wetlands: Potential Routes and Future Challenges

Journal of Hazardous Materials, Год журнала: 2025, Номер unknown, С. 138009 - 138009

Опубликована: Март 1, 2025

Язык: Английский

---

Mercury Accumulation and Biomagnification in the Barn Owl (Tyto alba) Food Chain

Journal of Hazardous Materials, Год журнала: 2025, Номер unknown, С. 138269 - 138269

Опубликована: Апрель 1, 2025

Язык: Английский

---

The effect of Zostera noltei recolonization on the sediment mercury vertical profiles of a recovering coastal lagoon

Chemosphere, Год журнала: 2023, Номер 345, С. 140438 - 140438

Опубликована: Окт. 16, 2023

Mercury's extreme toxicity and persistence in the environment justifies a thorough evaluation of its dynamics ecosystems. Aveiro Lagoon (Portugal) was for decades subject to mercury effluent discharges. A Nature-based Solution (NbS) involving Zostera noltei re-colonization is being tested as an active ecosystem restoration measure. To study effect on sediment contaminant biogeochemistry, seasonal (summer/winter) sediment, interstitial water labile vertical profiles were made vegetated (Transplanted Natural seagrass meadows) non-vegetated sites (Bare-bottom area). While no significant differences (p > 0.05) observed sedimentary phase, presence reduced reactive/labile concentrations top layers by up 40% when compared regardless season. No found between meadows, highlighting fast recovery regulation function provided plants after potential rehabilitation historically contaminated

Язык: Английский

---

Using Mercury Stable Isotopes to Quantify Directional Soil–Atmosphere Hg(0) Exchanges in Rice Paddy Ecosystems: Implications for Hg(0) Emissions to the Atmosphere from Land Surfaces

Environmental Science & Technology, Год журнала: 2024, Номер 58(25), С. 11053 - 11062

Опубликована: Июнь 13, 2024

Gaseous elemental mercury [Hg(0)] emissions from soils constitute a large fraction of global total Hg(0) emissions. Existing studies do not distinguish biotic- and abiotic-mediated focus only on photoreduction mediated emissions, resulting in an underestimation soil into the atmosphere. In this study, directional (Hg) reduction pathways paddy were identified using Hg isotopes. Results showed significantly different isotopic compositions between those produced (δ202Hg = −0.80 ± 0.67‰, Δ199Hg −0.38 0.18‰), microbial −2.18 0.25‰, 0.29 0.38‰), abiotic dark −2.31 0.50 0.22‰). exchange fluxes atmosphere dominated by with average flux ranging 2.2 5.7 to 16.8 21.7 ng m–2 h–1 during sampling periods. Using signature-based ternary mixing model, we revealed that is most important contributor soils. Albeit lower, contributed up 36 22 25 15%, respectively, 110th day. These novel findings can help improve future estimation rice ecosystems, which involve complex biotic-, abiotic-, processes.

Язык: Английский

---

Mercury Contamination Threatens Kentish Plover Populations in a key Conservation Reserve in the West Coast of India

National Academy Science Letters, Год журнала: 2024, Номер unknown

Опубликована: Дек. 10, 2024

Язык: Английский

---

Habitat and dissolved organic carbon modulate variation in the biogeochemical drivers of mercury bioaccumulation in dragonfly larvae at the national scale

The Science of The Total Environment, Год журнала: 2023, Номер 912, С. 169396 - 169396

Опубликована: Дек. 17, 2023

Язык: Английский

---