Abiotic and biotic factors influencing heavy metals pollution in fisheries of the Western Amazon

• DOI: 10.1016/j.scitotenv.2023.168506
• Publication Date: 2023-11-12T22:18:25Z
• Authors: Gabriela Echevarría; Nathan K. Lujan; José Montoya; María Genoveva Gr...; Jonathan Valdivie...; Fernando Sánchez; Francisco Cuesta; Blanca Ríos-Touma
• Keywords: Biomagnification

The escalating industrial and artisanal extraction of natural resources in the Amazon Basin has centered it into spotlight global environmental concern. This study deals with problems heavy metals pollution biomagnification, which stem from mining, agricultural, petrochemical, discharges. We conducted an extensive investigation, analyzing 360 fish specimens representing 58 species, to assess concentrations 11 (Al, As, Cd, Cr, Cu, He, Mn, Ni, Pb, Zn, Hg) along Ecuadorian sections Napo Pastaza watersheds. Stable isotope analyses (δ15N δ13C) were employed determine their trophic positions potential biomagnification risks. Sampling was carried out during two distinct hydrological seasons capture seasonal variations metal concentrations. Furthermore, we estimated species-specific daily intake levels. results our revealed that 15 species 53 individual exhibited surpassing recommended standards, elevated levels Al, Hg posing significant risks human consumers intakes 0.46 kg/day. Notably, investigation unveiled concerning trends, including increased concentrations, within populations watershed, association between smaller size higher content. provides a crucial baseline for monitoring future changes understanding persistent impacts region broader Western Amazon. It underscores urgent need sustainable management practices mitigate threat these vital ecosystems.