Oliveira E. S., Garnier J., Araújo D. F., Mulholland D. S., Dias-Roque D. F., Tonha M. S., Cicerelli R. E., Koide S., Bonnet Marie-Paule, Seyler Patrick, Roig H. L. (2026). Sources, mobility, and accumulation of major and trace elements in sediments : implications for environmental quality and management of an urbanized tropical lake (Brasília, Brazil). Limnology, [Early Access], p. [16 p.]. ISSN 1439-8621.
Titre du document
Sources, mobility, and accumulation of major and trace elements in sediments : implications for environmental quality and management of an urbanized tropical lake (Brasília, Brazil)
Année de publication
2026
Auteurs
Oliveira E. S., Garnier J., Araújo D. F., Mulholland D. S., Dias-Roque D. F., Tonha M. S., Cicerelli R. E., Koide S., Bonnet Marie-Paule, Seyler Patrick, Roig H. L.
Source
Limnology, 2026,
[Early Access], p. [16 p.] ISSN 1439-8621
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.
Plan de classement
Pollution [038]
;
Urbanisation et sociétés urbaines [102]
Description Géographique
BRESIL ; ZONE TROPICALE
Localisation
Fonds IRD [F B010096298]
Identifiant IRD
fdi:010096298
