Mercury Bioconcentration and Translocation in Rooted Macrophytes (Paspalum repens Berg.) from Floodplain Lakes in the Araguaia River Watershed, Brazilian Savanna

Macrophytes are fundamental photosynthetic organisms for functioning freshwater ecosystems, identified as potential bioindicators of mercury (Hg) in the environment. We quantified the concentrations of total Hg (THg) in water and macrophytes (Paspalum repens Berg.) from 17 lakes on the Araguaia Rive...

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Veröffentlicht in:Water (Basel) 2024-05, Vol.16 (9), p.1199
Hauptverfasser: Monteiro, Lucas Cabrera, Vieira, Ludgero Cardoso Galli, Bernardi, José Vicente Elias, Rodrigues, Ygor Oliveira Sarmento, de Mesquita, Lígia Pereira Borges, Souza, João Pedro Rudrigues de, Sena, Guilherme, Oliveira, Iuri Aparecida da Silva, Cabral, Cássio da Silva, Gonçalves Júnior, José Francisco, de Souza, Jurandir Rodrigues, Bastos, Wanderley Rodrigues
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container_end_page
container_issue 9
container_start_page 1199
container_title Water (Basel)
container_volume 16
creator Monteiro, Lucas Cabrera
Vieira, Ludgero Cardoso Galli
Bernardi, José Vicente Elias
Rodrigues, Ygor Oliveira Sarmento
de Mesquita, Lígia Pereira Borges
Souza, João Pedro Rudrigues de
Sena, Guilherme
Oliveira, Iuri Aparecida da Silva
Cabral, Cássio da Silva
Gonçalves Júnior, José Francisco
de Souza, Jurandir Rodrigues
Bastos, Wanderley Rodrigues
description Macrophytes are fundamental photosynthetic organisms for functioning freshwater ecosystems, identified as potential bioindicators of mercury (Hg) in the environment. We quantified the concentrations of total Hg (THg) in water and macrophytes (Paspalum repens Berg.) from 17 lakes on the Araguaia River floodplain, aiming to compare the bioconcentration factor (BCF) in the aerial tissues and roots; evaluate the translocation factor (TF) between plant tissues; and assess the influence of environmental factors and land use on THg concentrations in water and macrophytes. The BCF was significantly higher in roots (1.29 ± 0.32) than in aerial tissues (0.41 ± 0.34), with low TF between plant tissues (0.14 ± 0.06). The highest concentrations of THg in water were determined in lakes with higher land use intensity and a pH close to neutral, indicating the transport of particulate-bound Hg and the immobilization in the water column. In contrast, wetlands were priority areas for the bioconcentration of THg in macrophytes, associated with sulfate, dissolved oxygen, and oxidation–reduction potential in the water. Thus, although P. repens is not a suitable bioindicator of Hg mobilization by anthropogenic land use in our study area, our results suggest the potential of macrophytes as bioindicators of sites that are favorable to Hg methylation.
doi_str_mv 10.3390/w16091199
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We quantified the concentrations of total Hg (THg) in water and macrophytes (Paspalum repens Berg.) from 17 lakes on the Araguaia River floodplain, aiming to compare the bioconcentration factor (BCF) in the aerial tissues and roots; evaluate the translocation factor (TF) between plant tissues; and assess the influence of environmental factors and land use on THg concentrations in water and macrophytes. The BCF was significantly higher in roots (1.29 ± 0.32) than in aerial tissues (0.41 ± 0.34), with low TF between plant tissues (0.14 ± 0.06). The highest concentrations of THg in water were determined in lakes with higher land use intensity and a pH close to neutral, indicating the transport of particulate-bound Hg and the immobilization in the water column. In contrast, wetlands were priority areas for the bioconcentration of THg in macrophytes, associated with sulfate, dissolved oxygen, and oxidation–reduction potential in the water. 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subjects Air pollution
Aquatic ecosystems
Aquatic plants
Biogeochemistry
Brazil
Chemical elements
Deforestation
Environmental conditions
Fresh water
Hydrology
Indicators (Biology)
Land use
Methylation
Oxidation
Polyethylene terephthalate
Rivers
Scientific imaging
Sedimentation & deposition
Sediments
Sulfates
Watersheds
title Mercury Bioconcentration and Translocation in Rooted Macrophytes (Paspalum repens Berg.) from Floodplain Lakes in the Araguaia River Watershed, Brazilian Savanna
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