Tissue distribution of heavy metals in small cetaceans from the Southwestern Atlantic Ocean

Marcovecchio, Jorge Eduardo; Moreno, Víctor J.; Bastida, Ricardo; Gerpe, Marcela Silvia; Rodríguez, Diego H.

doi:10.1016/0025-326x(90)90595-y

Cited by 89 publications

(48 citation statements)

References 13 publications

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“…Levels of Cu and Zn in Franciscana dolphin were similar to those previously reported by Marcovecchio et al (1990) and Gerpe et al (2002) for Argentine waters, and by Lailson-Brito et al (2002) for Brazilian waters. Besides, Law et al (1991) reported a range of active regulation of both metals in liver, being from 3-30 lg g À1 for Cu (a factor of 10) and 20-100 lg g À1 for Zn (a factor of 5), approximately.…”

Section: Discussionsupporting

confidence: 90%

Metallothioneins pattern during ontogeny of coastal dolphin, Pontoporia blainvillei, from Argentina

Polizzi¹,

Romero²,

Boudet³

et al. 2014

Marine Pollution Bulletin

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a b s t r a c tMetallothioneins are signals of metal exposure and widely used in biomonitoring. Franciscana dolphin is an endemic cetacean from the Southwestern Atlantic Ocean, classified as Vulnerable A3d by the IUCN. Metallothionein, copper and zinc in Franciscana were assessed in two geographic groups; one inhabits La Plata River estuary, anthropogenically impacted, and the other inhabits marine coastal ecosystems, with negligible pollution. Despite the environment, hepatic and renal MT concentrations were similar, but there was a declining trend from early to later developmental stages. Metallothionein K/L, Cu and Zn levels corresponded to normal reported ranges. MT was not related with Cd. Fetal concentrations were higher than its mother. These results and the health status of dolphins are suggesting that MT correspond to physiological ranges for the species, and they are closely to homeostasis of Zn and Cu, according to its ontogenetic changes. The information constitutes the first MT information on Franciscana dolphin and can be considered as baseline for the species conservation.

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Section: Discussionsupporting

confidence: 90%

Metallothioneins pattern during ontogeny of coastal dolphin, Pontoporia blainvillei, from Argentina

Polizzi¹,

Romero²,

Boudet³

et al. 2014

Marine Pollution Bulletin

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“…Mercury concentration in liver, kidney and muscle from calves, juveniles and adults of Franciscana dolphins were according to those found by Gerpe et al (2002) in specimens of the same area; however hepatic concentrations were lower than those reported by Marcovecchio et al (1990), although these results were derived from only two juvenile dolphins. Liver concentrations of Hg were similar (Lailson-Brito et al, 2002) or higher (Kunito et al, 2004;de Carvalho et al, 2008;Moreira et al, 2009;Seixas et al, 2009;Di Beneditto et al, 2011) to those found in Franciscana dolphins from Brazil.…”

supporting

confidence: 79%

“…Due to their coastal and estuarine habits, Franciscana dolphins inhabit areas of great human activity, which poses threats to their conservation. Only two studies assessed Hg concentrations in Franciscana dolphins from Argentina (Marcovecchio et al, 1990;Gerpe et al, 2002) but without evaluation of the relationship with Se. This study assessed concentrations of mercury in Franciscana dolphins and evaluated possible mechanisms of mercury detoxification -MT, Se, transference to fetus and calves-in the species.…”

mentioning

confidence: 99%

The role of metallothioneins, selenium and transfer to offspring in mercury detoxification in Franciscana dolphins ( Pontoporia blainvillei )

Romero

Polizzi

Chiodi

et al. 2016

Marine Pollution Bulletin

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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.

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“…However, analyzing kidney samples of 2 franciscanas from Argentinean waters (i.e. FMA IV), Marcovecchio et al (1990) found an average cadmium concentration of 9 900 µg.kg -1 (wet wt.). Concentrations observed by the authors in Argentina were higher than those found by Lailson-Brito et al (2002) in individuals of the same species caught off Rio de Janeiro coast, since the highest renal cadmium concentration verified among 17 franciscanas analyzed in the latter study was 1 200 µg.kg -1 ww (Lailson-Brito et al, 2002).…”

Section: Discussionmentioning

confidence: 99%

Cadmium concentrations in franciscana dolphin (Pontoporia blainvillei) from south brazilian coast

et al. 2007

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A B S T R A C TFranciscana dolphins were used as source of information on the bioavailability of cadmium in the neritic waters off South Brazilian Coast. Liver samples obtained from 44 individuals incidentally captured off Rio Grande do Sul State were analyzed by electrothermal AAS. Cadmium concentrations, age, total weight and length of the analyzed dolphins varied between 39 and 4144 µg.kg -1 (wet weight), one and five years, 17.5 and 49.2 kg, and between 105.3 and 156.8 cm, respectively. Concerning hepatic cadmium concentrations of franciscanas, there was no significant difference between data raised by the present study and information from literature, regarding Rio de Janeiro State. The low cadmium concentrations observed may be attributed to the fact that loliginid squids constitute the main cephalopod prey for franciscanas. This study corroborates investigations on cadmium levels in Brazilian squids and strengthened the hypothesis that cephalopods of Loliginidae Family do not constitute important vectors of the transfer of cadmium to cetaceans. R E S U M OFranciscanas foram utilizadas como fonte de informação sobre a biodisponibilidade de cádmio em águas neríticas da Costa Sul do Brasil. Amostras de fígado, obtidas de 44 indivíduos capturados acidentalmente ao largo da costa do Rio Grande do Sul, foram analisadas através de EAA eletrotérmica. Concentrações de cádmio, idade, peso e comprimento totais dos golfinhos analisados variaram entre 39 e 4144 µg.kg -1 (peso úmido), um e cinco anos, 17,5 e 49,2 kg, e entre 105,3 e 156,8 cm, respectivamente. Em relação às concentrações hepáticas de cádmio em franciscanas, não houve diferença significativa entre os dados gerados pelo presente estudo e informação proveniente da literatura, referente ao Estado do Rio de Janeiro. As baixas concentrações de cádmio observadas podem ser atribuídas ao fato de as lulas da Família Loliginidae constituírem a principal presa para franciscanas, dentre os cefalópodes. Este estudo corrobora investigações sobre níveis de cádmio em lulas brasileiras e reforça a hipótese de que cefalópodes loliginídeos não constituem vetores importantes da transferência de cádmio para cetáceos.

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Tissue distribution of heavy metals in small cetaceans from the Southwestern Atlantic Ocean

Cited by 89 publications

References 13 publications

Metallothioneins pattern during ontogeny of coastal dolphin, Pontoporia blainvillei, from Argentina

Metallothioneins pattern during ontogeny of coastal dolphin, Pontoporia blainvillei, from Argentina

The role of metallothioneins, selenium and transfer to offspring in mercury detoxification in Franciscana dolphins ( Pontoporia blainvillei )

Cadmium concentrations in franciscana dolphin (Pontoporia blainvillei) from south brazilian coast

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