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Antarctic octopod beaks as proxy for mercury concentrations in soft tissues

Abstract : As the role of mercury is poorly known in Southern Ocean biota, the total mercury (T-Hg) concentrations were evaluated in upper/lower beaks, digestive gland, gills and mantle muscle of Adelieledone polymorpha and Pareledone turqueti, two of the most abundant octopod species around South Georgia. Beaks had the lowest T-Hg concentrations (A. polymorpha: [T-Hg]Upper= 27.2±12.9 ng•g-1 and [T-Hg]Lower= 27.5±20.0 ng•g-1 ; P. turqueti: [T-Hg]Upper= 34.6±13.9 ng•g-1 and [T-Hg]Lower= 56.8±42.0 ng•g-1), followed by gills and muscle. The highest values were recorded in the digestive glands (A. polymorpha: 251.6±69.7 ng•g-1 ; P. turqueti: 347.0±177.0 ng•g-1). Significant relationships were found between the concentrations of T-Hg in the beaks and muscle of A. polymorpha (T-Hg in muscle is 10 times higher than in beaks). This study shows that beaks can be used as proxy for T-Hg in muscle for some octopod species, and a helpful tool for estimating total Hg body burden from beaks.
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Submitted on : Tuesday, July 21, 2020 - 5:38:00 PM
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Ricardo Matias, José Seco, Susan Gregory, Mark Belchier, Maria Pereira, et al.. Antarctic octopod beaks as proxy for mercury concentrations in soft tissues. Marine Pollution Bulletin, Elsevier, 2020, 158, pp.111447. ⟨10.1016/j.marpolbul.2020.111447⟩. ⟨hal-02904180⟩



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