Oliveira E. S. auteur aut IRD Garnier J. auteur aut IRD Araújo D. F. auteur aut IRD Mulholland D. S. auteur aut IRD Dias-Roque D. F. auteur aut IRD Tonha M. S. auteur aut IRD Cicerelli R. E. auteur aut IRD Koide S. auteur aut IRD Bonnet Marie-Paule auteur aut IRD Seyler Patrick auteur aut IRD Roig H. L. auteur aut IRD text journalArticle eng text/pdf born digital access The quality of aquatic ecosystems is strongly influenced by inputs of nutrients and trace elements. Identifying their sources and bioavailability is critical for understanding elemental cycling and assessing environmental risks in lakes exposed to increasing anthropogenic pressures, such as Lake Paranoá, a man-made reservoir in Brasilia, Brazil. This study investigates the spatial distribution and geochemical partitioning of sedimentary nutrients and metals in Lake Paranoá to elucidate their origins and behavior. Sediment distribution patterns reflect the lake's hydrodynamics and proximity to input sources. Human-induced erosion from expanding urban areas contributes to the influx of both lithogenic and anthropogenic materials. Our results indicate that Ca, Mg, P, and Zn are predominantly derived from anthropogenic sources, notably domestic sewage discharges and leaching of construction-related materials. Sediments near the wastewater treatment plant (WWTP) exhibit particularly elevated concentrations of P, Ca, Mg, and Zn, identifying the WWTP as a key source of these elements. Moreover, the enrichment of P, Mn, and Zn in labile geochemical phases suggests that these elements may be readily mobilized from sediments into the water column during early diagenetic processes. Given that urban lakes provide critical ecosystem services-such as water supply, recreation, and biodiversity habitats-for a growing proportion of the world's urban population, and considering their increasing number globally, understanding sediment dynamics in these systems is essential for sustainable management. These findings offer valuable insights for assessing the potential impacts of the planned sediment dredging project in Lake Paranoá, and for informing future management strategies. specialized Metals contamination Phosphorous Sewage Aquatic ecosystem Environmental risk assessment BRESIL ZONE TROPICALE 038 102 [Early Access] [16 p.] 2026 1439-8621 https://www.documentation.ird.fr/hor/fdi:010096298 10.1007/s10201-025-00823-7 1439-8621 [F B010096298] https://www.documentation.ird.fr/hor/fdi:010096298 https://www.documentation.ird.fr/intranet/publi/2026-03/010096298.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2026-03-11 2026-03-11 fdi:010096298 fre