Article (Scientific journals)
The role of metallothioneins, selenium and transfer to offspring in mercury detoxification in Franciscana dolphins (Pontoporia blainvillei)
Romero, M.B.; Pollizi, P.; Chiodi, L. et al.
2016In Marine Pollution Bulletin
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Keywords :
marine mammals; pollution; Pontoporia blainvillei
Abstract :
[en] The concentrations of mercury (Hg), selenium (Se) and metallothioneins (MT) were evaluated in fetuses, calves, juveniles and adults of the endangered coastal Franciscana dolphin (Pontoporia blainvillei) from Argentina. Mercury concentrations varied among analyzed tissues (liver, kidney, muscle and brain), with liver showing the higher concentrations in all specimens. An age-dependent accumulation was found in liver, kidney and brain. No significant relationship between Hg and MT concentrations was found for all tissues analyzed. Hepatic Hg molar concentrations were positively correlated with those of Se, indicating a great affinity between these two elements. Furthermore, dark granules of HgSe were observed in Kupffer cells in the liver by electron microscopy, suggesting the role of this macrophage in the detoxification of Hg. A transfer of Hg through placenta was proved. The presence of Hg in brain in all age classes did not show concentrations associated with neurotoxicity.
Disciplines :
Environmental sciences & ecology
Aquatic sciences & oceanology
Author, co-author :
Romero, M.B.
Pollizi, P.
Chiodi, L.
Das, Krishna  ;  Université de Liège > Département de Biologie, Ecologie et Evolution > Océanographie biologique
Gerpe, M.
Language :
English
Title :
The role of metallothioneins, selenium and transfer to offspring in mercury detoxification in Franciscana dolphins (Pontoporia blainvillei)
Publication date :
2016
Journal title :
Marine Pollution Bulletin
ISSN :
0025-326X
Publisher :
Pergamon, Oxford, United Kingdom
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 20 May 2016

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