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BIBTEX RIS

Toxic and essential metals in Narcine brasiliensis (Elasmobranchii: Narcinidae): A baseline ecotoxicological study in the Southeast Atlantic and preliminary maternal transfer implications

2019; Elsevier BV; Volume: 149; Linguagem: Inglês

10.1016/j.marpolbul.2019.110606

1879-3363

Catarina Amorim Lopes, Nathan Lagares Franco Araujo, Leandro Rocha, Fernanda Monteiro, Rafael Christian Chávez Rocha, Tatiana Dillenburg Saint’Pierre, Daniela Silva Lutfi, Marcelo Vianna, Rachel Ann Hauser‐Davis,

Heavy Metal Exposure and Toxicity

The electric ray Narcine brasiliensis is captured as by-catch along the Brazilian coast and is considered data deficient by the International Union for Conservation of Nature (IUCN). In the present study, toxic and essential metals in adult and embryonic N. brasiliensis specimens from Southeastern Brazil were assessed by ICP-MS. The possibility of maternal metal transfer to embryos was evaluated. Several toxic elements were detected, including in the electric organ and gonads, leading to potential behavioral and reproductive concerns. Extremely high As levels were detected, probably a direct effect of the Mariana dam rupture ocurred in 2015, where mine tailings were transported throughout the Doce River basin in Southeastern Brazil, contaminating the entire water body. Statistically significant correlations was observed for both Mn and Ag between Size Class 2 embryos and mother tissues, evidencing maternal transfer for these elements. Although no other significant associations were observed, probably due to the low sample number, several toxic metals were also detected in the assessed embryos. This baseline data will aid in future biomonitoring efforts and conservation measures.