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• W3162863178 endingPage "147797" @default.
• W3162863178 startingPage "147797" @default.
• W3162863178 abstract "The estuary of Río de la Plata, in the eastern coast of South America, is a highly anthropized area that brings a high load of contaminants to the surrounding waters, which may have detrimental effects on the local marine fauna. The franciscana dolphin ( Pontoporia blainvillei ) is a small cetacean species endemic of the southwestern Atlantic Ocean listed as Vulnerable in the IUCN red list. In this study, we assessed the concentrations of 13 trace elements in bone samples from 100 franciscana dolphins that were found stranded dead or incidentally bycaught in the Río de la Plata and adjacent coast between 1953 and 2015. Elements were, in decreasing order of mean concentrations: Zn > Sr > Fe > Al > Mn > Cu > Pb > Cr > Ni > As > Hg > Cd > Se. The concentrations of Al, Cr and Fe were slightly higher in females than in males. The concentrations of As, Ni, and Pb significantly decreased with body length. Throughout the study period, the concentrations of Al, Cr, Cu, Fe, Mn and Ni significantly increased, while the concentrations of As, Pb and Sr significantly decreased. The increasing trends may be due to increased inputs from river discharges, the leather industry and petroleum refineries, while the decrease in Pb may be due to the ban in the use of this element as an additive in gasoline and as component of car batteries. This investigation supports the validity of analysing trace element in bone, a tissue available in scientific collections and museums, to retrospectively examine variation over long temporal scales and thus assess long-term trends in pollution. • We assessed trace element concentrations in franciscana dolphin bone samples. • We analysed 100 individuals from the Río the la Plata estuary and adjacent Atlantic coast. • Al, Cr, Cu, Fe, Mn and Ni levels significantly increased during the period 1953–2015. • As, Pb and Sr concentrations significantly decreased during the period 1953–2015. • Cr, Cu, Fe, Ni and Pb concentration trends were likely related to anthropogenic activities." @default.
• W3162863178 created "2021-05-24" @default.
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• W3162863178 date "2021-09-01" @default.
• W3162863178 modified "2023-10-12" @default.
• W3162863178 title "Long-term assessment of trace elements in franciscana dolphins from the Río de la Plata estuary and adjacent Atlantic waters" @default.
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• W3162863178 doi "https://doi.org/10.1016/j.scitotenv.2021.147797" @default.
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