Effects of Selenium on Mercury Bioaccumulation in a Terrestrial food Chain from an Abandoned Mercury Mining Region
| Autor: | Xiaodong Yang, Xiaohang Xu, Kang Luo, Eben Goodale, Kasun S. Abeysinghe, Zhidong Xu, Guangle Qiu |
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| Rok vydání: | 2018 |
| Předmět: |
Food Chain
Insecta Health Toxicology and Mutagenesis Biomagnification chemistry.chemical_element 010501 environmental sciences Toxicology 01 natural sciences Mining Birds Food chain Selenium Ecotoxicology Animals Herbivory 0105 earth and related environmental sciences Trophic level Nitrogen Isotopes Chemistry fungi food and beverages 04 agricultural and veterinary sciences General Medicine Mercury Feathers Pollution Isotopes of nitrogen Mercury (element) Environmental chemistry Bioaccumulation 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Water Pollutants Chemical Environmental Monitoring |
| Zdroj: | Bulletin of environmental contamination and toxicology. 102(3) |
| ISSN: | 1432-0800 |
| Popis: | Few reports of the relationship exist between mercury (Hg) and selenium (Se) from locations of severe Hg contamination in terrestrial environments. Here, we report the concentrations of Hg and Se as well as Se:Hg molar ratios in biotic samples collected from a region with a long history of Hg mining. Nitrogen isotopes (δ15N) were analyzed to confirm the trophic levels. Results showed that bird feathers at the top trophic level exhibited the highest Hg concentrations, while the lowest concentrations were found in herbivorous insects, demonstrating a significant biomagnification across the food chain. In contrast, herbivorous insects of different types (generalists vs. specialized rice pests) exhibited both the highest and the lowest concentrations of Se, indicating a lack of biomagnification. Indeed, Se was correlated positively with Hg when Se:Hg ratios were greater than one, suggesting Se:Hg molar ratios can be a controlling influence on Hg in terrestrial organisms. |
| Databáze: | OpenAIRE |
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