Methylmercury and Trace Element Distribution in the Organs of Stenella coeruleoalba Dolphins Stranded on the French Mediterranean Coast
Emmanuel Wafo*, 1, Véronique Risoul2, Thérèse Schembri3, Véronique Lagadec4, Frank Dhermain5, Chacha Mama6, Pierre Boissery7, Henri Portugal8
Identifiers and Pagination:Year: 2014
First Page: 35
Last Page: 48
Publisher Id: TOENVIRJ-8-35
Article History:Received Date: 20/05/2014
Revision Received Date: 15/09/2014
Acceptance Date: 16/09/2014
Electronic publication date: 26/11/2014
Collection year: 2014
open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
The main objective of this study was to evaluate the contamination by mercury (Hg), methylmercury (Me-Hg), cadmium (Cd), selenium (Se), zinc (Zn), copper (Cu), iron (Fe) and manganese (Mn) in dolphins stranded on the French Mediterranean coast.
The distributions of these contaminants in the organs of dolphins have also been studied. Overall, contamination levels varied according to the following sequence: liver > kidney > lung > muscle, except for cadmium (kidney > liver > lung > muscle).
Size and sex of animals were also considered. Young dolphins were less impacted with trace elements than adults, except for copper. Among the studied parameters, the most important appeared to be the size of mammals. In addition, in the case of mercury and selenium, the sex of mammals seemed to be also relevant.
The correlations between the concentrations of trace elements suggest the existence of detoxification processes.
Since 1990s, using dolphins for tracing marine pollution, a slight reduction in the burden of the considered trace elements could be noted.