Variation in Hg accumulation between demersal and pelagic fish from Puruzinho Lake, Brazilian Amazon

Azevedo, Lucas Silva; Pestana, Inácio Abreu; Nery, Adriely Ferreira da Costa; Bastos, Wanderley Rodrigues; Souza, Cristina Maria Magalhães de

doi:10.1007/s10646-019-02118-x

Cited by 8 publications

(9 citation statements)

References 58 publications

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“…The Madeira River and its floodplains serve as significant boundaries in the geographic zoning of the ecoregions considered in this study. The results related to animals were predominantly from aquatic ecosystems and were assessed within the context of the fish food web and bioconcentration of Hg, considering the differences between pelagic and demersal species and their distinct feeding groups in these tropical zones (feeding guilds) [ 41 , 77 ].…”

Section: Discussionmentioning

confidence: 99%

“…High water levels generally present higher total Hg concentrations in fish tissues. Low water levels in blackwater tributaries, which are commonly believed to contain higher levels of inorganic Hg, do not necessarily result in higher tissue Hg, as low water factors may block the synthesis of Hg [ 77 ]. Occupational exposure from gold mining was unexpectedly lower than that in the riverside control group [ 146 ].…”

Section: Discussionmentioning

confidence: 99%

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Trends in Mercury Contamination Distribution among Human and Animal Populations in the Amazon Region

Martoredjo,

Calvão Santos,

Vilhena

et al. 2024

Toxics

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Mercury contamination in the Amazon arising from both natural sources and intensive mining activities in the region is a significant public health concern. This metal is used to separate Au from sediments. Accordingly, this study aimed to assess the impact of mining on mercury contamination in the animal and human populations of the Amazon. This overall objective was pursued through a systematic review of the existing literature to assess the impact of Hg and identify gaps in geographic coverage arising from this assessment. Herein, we employed PECO and PRISMA-ScR protocols to select articles published between 2017 and 2023 based on projected points on a map within the biogeographic boundaries of the Amazon. We found that mercury concentrations increase with trophic levels, reaching high values of 3.7 µg/g in the muscles of predatory fish and 34.9 µg/g in human hair. The mean level of mercury in human hair in the whole (Amazon) region exceeds 6 µg/g, surpassing tolerance levels. Although mining regions show high concentrations of Hg, the highest incidence was observed among populations with fish-based diets. It was concluded that continuous research and monitoring of fish in the region are required in order to accurately assess the risk associated with Hg contamination, especially since fish are the main source of protein in this region.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Trends in Mercury Contamination Distribution among Human and Animal Populations in the Amazon Region

Martoredjo,

Calvão Santos,

Vilhena

et al. 2024

Toxics

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“…Mercury (Hg) is one of the toxic heavy metals that spread out in aquatic habitats mainly from agricultural waste containing pesticides, in addition to occurring naturally in the atmosphere and could be deposited via weathering [ 6 ]. It is considered the third most dangerous environmentally heavy metal pollutant after arsenic and lead, found in the environment in three different forms elementary (Hg 0 ), organic (methylmercury “MeHg”), and inorganic (chloride mercury “HgCl 2 ”).…”

Section: Introductionmentioning

confidence: 99%

“…Several factors can cause Hg 2+ accumulation in fish tissues. Environmental factors such as pH of the water, dissolved organic carbon, and other biological factors including fish age, size, foraging habitat, and primary productivity can all influence bioaccumulation [ 6 , 17 ]. Low primary productivity leads to high Hg 2+ concentrations because of the algal bio-dilution, which increases the accumulated MeHg levels [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

“…Environmental factors such as pH of the water, dissolved organic carbon, and other biological factors including fish age, size, foraging habitat, and primary productivity can all influence bioaccumulation [ 6 , 17 ]. Low primary productivity leads to high Hg 2+ concentrations because of the algal bio-dilution, which increases the accumulated MeHg levels [ 6 ]. Additionally, Hg 2+ concentrations increased with fish size, and higher concentrations were reported in the bottom (demersal) than in the surface (pelagic) fish and concerning percent floodable area rather than the hydromorphic soils, which did not influence fish Hg level [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

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Toxicity Evaluation, Oxidative, and Immune Responses of Mercury on Nile Tilapia: Modulatory Role of Dietary Nannochloropsis oculata

Zahran¹,

Ahmed²,

Hassan³

et al. 2023

Biol Trace Elem Res

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The current study evaluated the potential ameliorative effect of a dietary immune modulator, Nannochloropsis oculata microalga, on the mercuric chloride (HgCl2)-induced toxicity of Nile tilapia. Nile tilapia (45–50 g) were fed a control diet or exposed to ¼ LC50 of HgCl2 (0.3 mg/L) and fed on a medicated feed supplemented with N. oculata (5% and 10% (50 or 100 g/kg dry feed)) for 21 days. Growth and somatic indices, Hg2+ bioaccumulation in muscles, and serum acetylcholinesterase (AChE) activity were investigated. Antioxidant and stress-related gene expression analyses were carried out in gills and intestines. Histopathological examinations of gills and intestines were performed to monitor the traits associated with Hg2+ toxicity or refer to detoxification. Hg2+ toxicity led to significant musculature bioaccumulation, inhibited AChE activity, downregulated genes related to antioxidants and stress, and elicited histopathological changes in the gills and intestine. Supplementation with N. oculata at 10% was able to upregulate the anti-oxidative-related genes while downregulated the stress apoptotic genes in gills and intestines compared to the unexposed group. In addition, minor to no histopathological traits were detected in the gills and intestines of the N. oculata-supplemented diets. Our data showed the benefit of dietary N. oculata in suppressing Hg2+ toxicity, which might support its efficacy as therapeutic/preventive agent to overcome environmental heavy metal pollution in aquatic habitats.

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Dynamics of (total and methyl) mercury in sediment, fish, and crocodiles in an Amazonian Lake and risk assessment of fish consumption to the local population

Gomes

Moreira

Sanches

et al. 2020

Environ Monit Assess

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Variation in Hg accumulation between demersal and pelagic fish from Puruzinho Lake, Brazilian Amazon

Cited by 8 publications

References 58 publications

Trends in Mercury Contamination Distribution among Human and Animal Populations in the Amazon Region

Trends in Mercury Contamination Distribution among Human and Animal Populations in the Amazon Region

Toxicity Evaluation, Oxidative, and Immune Responses of Mercury on Nile Tilapia: Modulatory Role of Dietary Nannochloropsis oculata

Dynamics of (total and methyl) mercury in sediment, fish, and crocodiles in an Amazonian Lake and risk assessment of fish consumption to the local population

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