Pollutant Pb burden in Mediterranean Centroscymnus coelolepis deep-sea sharks

A. Véron (1, 2) , A Dell'Anno (3) , M O Angelidis (4) , M Aloupi (4) , R Danovaro (3, 5) , O. Radakovitch (6, 1) , A Poirier (2) , S Heussner (7)

1 CEREGE - Centre européen de recherche et d'enseignement des géosciences de l'environnement
2 GEOTOP - Centre de recherche sur la dynamique du système Terre
3 UNIVPM - Polytechnic University of Marche [Ancona, Italy] / Università Politecnica delle Marche [Ancona, Italia]
4 University of the Aegean
5 SZN - Stazione Zoologica Anton Dohrn
6 IRSN/PSE-ENV/SRTE/LRTA - Laboratoire de recherche sur les transferts des radionucléides dans les écosystèmes aquatiques
7 CEFREM - Centre de Formation et de Recherche sur les Environnements Méditérranéens

We report lead (Pb) analyses in juvenile (n = 37; mean length = 24.7 ± 2.3 cm) and adult (n = 16; mean length = 52.3 ± 9.3 cm) Centroscymnus coelolepis Mediterranean deep-sea sharks that are compared to Pb content in bathy-demersal, pelagic and shallow coastal sharks. Median Pb concentrations of C. coelolepis muscle (0.009-0.056 wet ppm) and liver (0.023-0.061 wet ppm) are among the lowest encountered in shark records. Stable Pb isotope imprints in adult C. coelolepis muscles highlight that most of Pb in C. coelolepis is from human origin. Lead isotopes reveal the persistence of gasoline Pb emitted in the 1970s in low-turnover adult shark's muscle while associated liver imprints are in equilibrium with recent pollutant Pb signatures suggesting an efficient pollutant Pb turnover metabolism. The comparison of Pb distribution between adult and juvenile cohorts suggests the role of dietary exposure and possible maternal offloading of Pb during gestation, likely associated to vitellogenesis in this aplacental viviparous deep-sea shark.

Mots clés: • Lead (Pb); Mediterranean Sea; Pb isotopes; Gasoline; Centroscymnus coelolepis deep-sea; • Lead (Pb)

Domaines: Sciences de l'environnement

A. Véron, A Dell'Anno, M O Angelidis, M Aloupi, R Danovaro, et al.. Pollutant Pb burden in Mediterranean Centroscymnus coelolepis deep-sea sharks. Marine Pollution Bulletin, 2022, ⟨10.1016/j.marpolbul.2021.113245⟩. ⟨hal-03482068⟩