Trace element levels in foetus–mother pairs of short-beaked common dolphins (Delphinus delphis) stranded along the French coasts

Centre de Recherche sur les Ecosystèmes Littoraux Anthropisés, UMR 6217 CNRS-IFREMER-Université de La Rochelle, Université de La Rochelle, 22 Avenue Michel Crépeau, 17042 La Rochelle Cedex, France.
Environment International (Impact Factor: 5.56). 12/2007; 33(8):1021-8. DOI: 10.1016/j.envint.2007.05.008
Source: PubMed


Tissues of foetus-mother pairs of common dolphins (Delphinus delphis) stranded along the French coasts (Bay of Biscay and English Channel) were analysed for their Cd, Cu, Hg, Se and Zn contents. In the kidneys, foetal Cd levels were extremely low, and strong relationships between Cu and Zn suggested the involvement of metallothioneins since early foetal life. The results also indicated a limited maternal transfer of Hg during pregnancy since levels in the tissues of foetuses were below 1 microg g(-1) w.wt. However, hepatic Hg levels in foetuses increased with body length, and were also proportionate to maternal hepatic, renal and muscular Hg levels. Lastly, affinities between Hg and Se in tissues would participate in Hg neutralisation in both mothers--through tiemannite granules--and fetuses--through reduced glutathione--counteracting the toxic effects linked to the particularly high quantities of methyl-Hg to which marine mammals are naturally exposed.

Download full-text


Available from: Paco Bustamante
  • Source
    • "In the current study, Cu in muscle and kidney and Zn in muscle significantly decreased with body length (p < 0.05) whilst Zn in epidermis significantly increased (p < 0.01). Because these elements cross the placental barrier and accumulate in the foetal liver, which has higher metallothionein content than the liver of adults for the storage of essential elements for foetal growth (Teigen et al., 1999), many studies on marine mammals have shown higher concentrations of Cu in the foetus than in adults (Law, 1996; Lahaye et al., 2007; Agusa et al., 2008; .Yang et al., 2004). In addition , higher concentrations of Cu and Zn in juveniles than in adults have been also found in previous studies (Honda et al., 1983; Law, 1996; Teigen et al., 1999; Zhou et al., 2001; Agusa et al., 2008). "
    [Show abstract] [Hide abstract]
    ABSTRACT: Trace elements accumulate in epidermis, liver, kidney and muscle tissues in cetaceans. However, contrarily to internal tissues, epidermis can be sampled using minimally-invasive techniques. We investigate the patterns of trace element tissue concentrations in relation to individual sex and length and the degree of inter-tissue equilibrium between epidermis and the main internal organs of the Mediterranean striped dolphin. With it, we aim to test whether epidermis is a suitable tissue to predict trace element concentrations of internal tissues in cetaceans. We focused on trace elements with high potential toxicity (mercury and cadmium) or biological significance (zinc, copper and selenium). In contrast to what was found for Cu and Zn, the concentrations of Hg, Cd and Se in epidermis were positively correlated with the levels found in the internal tissues sampled probably due to their capacity to bioaccumulate. Thus, we conclude that sampling and analysing epidermis is appropriate to monitor and predict the concentrations of Hg, Cd and Se in internal tissues but not for Cu and Zn.
    Full-text · Article · Feb 2015 · Chemosphere
  • Source
    • "The data available in the literature on elemental contents in marine mammals is mostly on those with known toxic effects (Honda et al. 1983; André et al. 1990; Caurant et al. 2006) and on essential elements (Caurant et al. 1994; Wood and Van Vleet 1996; Lahaye et al. 2007); however, little information can be found about elements like Ag, V and electrolytes such as Cl, Na and K (Mackey et al. 1996; Seixas et al. 2009a). In addition, these studies involve specimens derived usually from bycatch or stranding events (Lahaye et al. 2007), and significant features are hindered by difficulties arising from examining tissues that have undergone post-mortem autolysis (Lavery et al. 2009). Because, in most cases, these are the only specimens available for research, an opportunistically but basic source of information (Holsbeek et al. 1998; Storelli et al. 1998; Law et al. 2003), it is important that the methods for measuring elemental contents in carcasses are developed to allow accurate determinations of the animals' health, nutritional status and relation with the marine environment (Aguilar et al. 1999; Lavery et al. 2008, 2009; Agusa et al. 2011). "
    [Show abstract] [Hide abstract]
    ABSTRACT: A survey of the elemental contents of K, Mg, Mn, Na, Cl, Br, Cs, Co, Rb, Fe, Zn, Al, Ti, V, As, Ag, Au and Cd in liver, kidney and muscle was performed in specimens of Commerson’s dolphins (Cephalorhynchus c. commersonii) from subantarctic waters. The concentrations were determined by Instrumental Neutron Activation Analysis and the specimens derives from animals incidentally caught in artisanal fishing nets. Liver had the highest concentrations of Fe, 897(79) μgg−1 DW (dry weight) (average; standard deviation in parenthesis), kidney had the highest Cd, 35 (24) μgg−1 DW; Cl, 9,200 (1,700) μgg−1 DW; Na, 6,800 (1,100) μgg−1 DW and Br, 73(12) μgg−1 DW; and muscle the highest Mg 954 (71) μgg−1 DW. Potassium and Cs concentrations in muscle and kidney ranged in 12,510–13,020 and 0.230–0.252 μgg−1 DW, respectively; Zn and Mn concentrations were similar in liver and kidney (117–122.1 and 3.66–16.5 μgg−1 DW, respectively). Silver was high in liver 5.4(5.0) μgg−1 DW and kidney 1.2(2.7) μgg−1 DW. Gold, Rb, Co and As had no differences among tissues. Likewise, as in other odontocete species, the concentrations of essential elements showed little variation between the specimens analyzed, since they are regulated biochemically; however, heavy metals showed high variability. This study constitutes the first large description of the elemental composition in Commerson’s dolphins fromsubantarctic waters of the South Atlantic Ocean.
    Full-text · Article · Jul 2013 · Environmental Monitoring and Assessment
  • Source
    • "Frodello et al. (2000) reported that Hg accumulation in the common dolphin was highest in the liver, and then occurred, in descending order, in: kidney > muscle > skin > gill > muscle. Similar patterns of Hg accumulation in the common dolphin have also been reported from the French coast (Holsbeek et al. 1998; Lahaye et al. 2007), in the Irish Sea (Law et al. 1992), and off New Zealand (Stockin et al. 2007) (Table 3). Wagemann and Muir (1984) "
    [Show abstract] [Hide abstract]
    ABSTRACT: Concentrations of trace metals (As, Cd, Cr, Cu, Pb, Hg, Se, and Zn) were determined in the livers, kidneys, muscles, intestines, and hearts of twelve long-beaked common dolphins (Delphinus capensis) from the East Sea, Korea, in 2006. All specimens were entangled in various commercial fishing nets or traps and as such are recorded as by-catch. The concentrations of Cu, Hg, Se, and Zn were much higher in the liver than in the kidney, muscle, intestine, or heart. Trace metals that accumulated in the liver were, in descending order: Zn > Hg > Cd > Se > Cu > As > Cr > Pb. In contrast, the concentration of Cd was higher in the kidney than in any other organs. The trace metals accumulated in the kidney were, in descending order: Cd > Zn > Cu > Hg > Se > As > Pb > Cr. No significant differences were found in the concentrations of As, Cr, or Pb in all the tissues examined. Key wordslong-beaked common dolphin– Delphinus capensis –trace metal–bioaccumulation–tissues–East Sea–Korea
    Full-text · Article · Jun 2011 · Ocean Science Journal
Show more