CEREGE, UMR7330 CNRS, AMU, IRD, Coll. France, INRAE, Technopole Arbois, BP80, 13545 Aix en Provence cedex 4, France; GEOTOP, Université du Québec à Montréal, CP8888 Centre-Ville, Montréal, QC H3C3P8, Canada.
Department of Life and Environmental Sciences, Polytechnic University of Marche, Via Brecce Bianche, 60131 Ancona, Italy.
Mar Pollut Bull. 2022 Jan;174:113245. doi: 10.1016/j.marpolbul.2021.113245. Epub 2022 Jan 4.
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.
我们报告了幼年（n=37；平均长度=24.7±2.3cm）和成年（n=16；平均长度=52.3±9.3cm）中光尾鲨（Centroscymnus coelolepis）的铅（Pb）分析，这些鲨鱼与深海、远洋和浅海沿海鲨鱼的 Pb 含量进行了比较。中光尾鲨肌肉（湿重 ppm 0.009-0.056）和肝脏（湿重 ppm 0.023-0.061）中的 Pb 浓度中位数在鲨鱼记录中属于最低水平之一。成年中光尾鲨肌肉中的稳定 Pb 同位素印记表明，中光尾鲨中的大部分 Pb 来自人为来源。Pb 同位素揭示了 20 世纪 70 年代汽油 Pb 在低周转率成年鲨鱼肌肉中的持久性，而相关的肝脏印记与最近的污染物 Pb 特征处于平衡状态，表明污染物 Pb 代谢周转率较高。成年和幼年群体之间 Pb 分布的比较表明，饮食暴露和妊娠期间母体可能会排出 Pb，这可能与卵黄发生有关，卵黄发生是这种无胎盘胎生深海鲨鱼的一种特征。
