AI Article Synopsis
- Mercury (Hg) is a toxic element that can bioaccumulate in ecosystems, leading to higher concentrations in organisms than in their environment, as shown in a study from the Middle Araguaia floodplain in Brazil.
- The study found that total mercury concentrations in litter were significantly higher than in soil, and these levels showed a linear relationship with soil organisms, allowing for predictions based on litter samples.
- The research indicates how the distribution and feeding habits of soil organisms are affected by mercury levels, highlighting the environmental risks associated with mercury exposure in this river basin.
Article Abstract
Mercury (Hg) is a chemical element that, depending on its concentration, may become toxic to living organisms due to the ability of Hg to bioaccumulate in food chains. In this study, we collected samples of soil, litter, and organisms in the Middle Araguaia floodplain, Brazil. Total mercury (THg) concentrations in litter were significantly higher (p < 0.0001) than that in soil, ranging from 10.68 ± 0.55 to 48.94 ± 0.13 and 20.80 ± 1.07 to 55 .19 ± 1.59 ng g, respectively. Total mercury concentration levels in soil showed a linear, inversely proportional relationship with soil organic matter (SOM) contents and soil pH, consistent with the geochemical behavior of chemical elements in flooded environments. Ten orders of organisms were identified, and the average THg concentrations determined in their bodies were up to 20 times higher than those in soil and litter. We found a significant linear relationship between the levels of THg in litter and those found in soil organisms, thereby allowing the prediction of THg concentration levels in soil organisms through the analysis of litter at the sample units. The different dynamics and feeding habits of soil organisms and the concentration of THg in these organisms may be influenced by the river's course. This study provides evidence of the bioaccumulation of THg in soil organisms in the floodplain of the Middle Araguaia River, an important river basin in the Brazilian savanna.
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Article Synopsis
- Mercury (Hg) is a toxic element that can bioaccumulate in ecosystems, leading to higher concentrations in organisms than in their environment, as shown in a study from the Middle Araguaia floodplain in Brazil.
- The study found that total mercury concentrations in litter were significantly higher than in soil, and these levels showed a linear relationship with soil organisms, allowing for predictions based on litter samples.
- The research indicates how the distribution and feeding habits of soil organisms are affected by mercury levels, highlighting the environmental risks associated with mercury exposure in this river basin.
Taxonomic revision of Sturisoma Swainson, 1838 (Loricariidae: Loricariinae), with descriptions of four new species.
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April 2024
Departamento de Vertebrados-Setor de Ictiologia, Universidade Federal do Rio de Janeiro, Museu Nacional, Rio de Janeiro, Brazil.
A taxonomic revision of Sturisoma is presented. Individuals including both type and non-type specimens of all valid species were examined. Sturisoma was found to comprise 10 valid species: Sturisoma barbatum, Sturisoma brevirostre, Sturisoma graffini, Sturisoma guentheri, Sturisoma lyra, Sturisoma monopelte, Sturisoma nigrirostrum, Sturisoma reisi, Sturisoma rostratum, and Sturisoma tenuirostre.
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