Effects of Selenium on Mercury Bioaccumulation in a Terrestrial food Chain from an Abandoned Mercury Mining Region.
Bull Environ Contam Toxicol
; 102(3): 329-334, 2019 Mar.
Article
em En
| MEDLINE
| ID: mdl-30637433
ABSTRACT
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 SeHg 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 SeHg ratios were greater than one, suggesting SeHg molar ratios can be a controlling influence on Hg in terrestrial organisms.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Selênio
/
Monitoramento Ambiental
/
Cadeia Alimentar
/
Mercúrio
Limite:
Animals
Idioma:
En
Revista:
Bull Environ Contam Toxicol
Ano de publicação:
2019
Tipo de documento:
Article
País de afiliação:
China