Mercury in aquatic ecosystems

Jackson, Togwell A.

doi:10.1007/978-1-4757-2761-6_5

Cited by 59 publications

(77 citation statements)

References 229 publications

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“…The basis of metal toxicity is the inhibition of enzymatic systems of cells, resulting from substitution of other metal ions (mainly Cu 2+ , Zn 2+ and Ca 2+ ) (Jackson, 1998). One of the most common detoxification strategies observed in marine vertebrates is the binding of metals to metallothioneins (Mason and Jenkins, 1995).…”

Section: Detoxification Processesmentioning

confidence: 99%

Bioaccumulation of trace elements in pelagic fish from the Western Indian Ocean

Kojadinovic¹,

Potier²,

Corre³

et al. 2007

Environmental Pollution

251

151

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Trace elements were analyzed in fish of commercial interest to determine their importance in marine systems of the Western Indian Ocean and their bioaccumulation patterns. The results are equivalent or lower than levels reported in ichthyofauna worldwide. Certain values of muscular Cd, Hg, Pb and Zn were however above thresholds for human consumption. Levels varied among tissues, species and with fish length, but were seldom influenced by the nutritional condition of the fish, its gender and its reproductive status. Correlations between hepatic Hg and Se levels in Swordfish (r 2 = 0.747) and Yellowfin Tunas (r 2 = 0.226), and among metallothionein linking metals imply the existence of detoxification processes in these species. Differences in levels between fish from the Mozambique Channel and Reunion Island probably reflect differences of diets rather than differences of elemental availability in both environments.Capsule : Metal bioaccumulation was quantified in four species of pelagic fish.

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Section: Detoxification Processesmentioning

confidence: 99%

Bioaccumulation of trace elements in pelagic fish from the Western Indian Ocean

Kojadinovic¹,

Potier²,

Corre³

et al. 2007

Environmental Pollution

251

151

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“…Mercury is one of the most hazardous environmental pollutants and it is not known to play any essential role in biochemical functions (Jackson 1998). Low elimination rates lead to increasing concentrations in web chains and storage in higher food-chain organisms (Pinho et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Relationships between total and organic mercury concentrations in tissues and length of common dolphins (Delphinus delphis) from the Portuguese coast

Cecilio¹

2006

CiencMar

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“…This was confirmed by Stary and Kratzer [43] who found that mercury forms thiolate complexes exhibiting extraordinarily high formation constants. Whereas for HgCys 2 complexes this value was reported to be about 10 42 , similar formation constants for methylmercury and phenylmercury achieve only 10 15 and 10 16 , respectively.…”

Section: Discussionmentioning

confidence: 87%

“…However, in the presence of DMSO, a release of Mn 2+ ions from the oxygen evolving complex was not estimated. Moreover, a decrease of the rate of PET The lower inhibitory effect of organomercury compounds on PET compared with HgCl 2 can be probably caused by the fact that the chemical affinity of organomercury for ligands, including amino acid residues in peptides, is similar to that of Hg 2+ but the stability constants of methylmercury complexes with these ligands are consistently lower than those of the corresponding Hg 2+ complexes [42]. This was confirmed by Stary and Kratzer [43] who found that mercury forms thiolate complexes exhibiting extraordinarily high formation constants.…”

Section: Discussionmentioning

confidence: 99%

Action of Some Organomercury Compounds on Photosynthesis in Spinach Chloroplasts

Šeršeň¹,

Kráľová²

2013

Ecological Chemistry and Engineering S

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Abstract:The effects of five organomercury compounds (methylmercuric chloride, phenylmercuric acetate, phenylmercuric borate, phenylmercuric citrate and diphenylmercury) on photosynthetic electron transport (PET) in spinach chloroplasts were investigated. The IC50 values of organomercury compounds related to PET inhibition in spinach chloroplasts varied in the range from 468 µmol dm -3 to 942 µmol dm -3 and were approximately by one order higher than the corresponding value determined for HgCl2 applied also in DMSO solution (IC50 = 58 µmol dm ). Due to extremely low aqueous solubility of diphenylmercury, the corresponding IC50 value could not be determined. Using EPR spectroscopy as probable sites of action of organomercury compounds in photosynthetic apparatus ferredoxin on the acceptor side of PS 1 and the quinone electron acceptors QA or QB on the reducing side of PS 2 were suggested.

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Mercury in aquatic ecosystems

Cited by 59 publications

References 229 publications

Bioaccumulation of trace elements in pelagic fish from the Western Indian Ocean

Bioaccumulation of trace elements in pelagic fish from the Western Indian Ocean

Relationships between total and organic mercury concentrations in tissues and length of common dolphins (Delphinus delphis) from the Portuguese coast

Action of Some Organomercury Compounds on Photosynthesis in Spinach Chloroplasts

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