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The role of the freshwater oligochaete Limnodrilus hoffmeisteri in the distribution of Se in a water/sediment microcosm
- Source :
- The Science of the total environment. 687
- Publication Year :
- 2019
-
Abstract
- Selenite(IV) and selenate(VI) are the major species of Se in the seleniferous aquatic ecosystem. The redistribution of Se in the water/sediment microcosm by bioturbation remains largely unknown. In this study, the redistribution of Se in the water/sediment microcosm by the benthic oligochaete Limnodrilus hoffmeisteri was assessed. The worms were exposed to 2–40 μg/g dry weight of Se(IV) or Se(VI) in the sediment (diet) for 2 months. The changes in the Se levels in different compartments of the microcosm (sediment, overlying water, and worms) were quantified after 2 weeks and 2 months. The subcellular distribution of Se in the worms were also evaluated. Finally, the volatilization of Se from the two Se sources was estimated. The results showed that Se concentration in the overlying water and Se bioaccumulation in the worms were increased with Se levels in the sediments. Approximately 1.6–9.8% of Se was volatilized in the absence of the worms and was intensified in the presence of the worms (2.1–25.7%). The subcellular distribution witnessed high levels of Se in the cell debris (>60%). Se(IV) and Se(VI) differ in their bioaccumulation, redistribution and the effects on the growth of the worms. Our results suggest that the bioturbation by benthos play an essential role in the redistribution of Se in the water/sediment microcosm.
- Subjects :
- Geologic Sediments
Environmental Engineering
010504 meteorology & atmospheric sciences
Fresh Water
010501 environmental sciences
01 natural sciences
Selenium
Benthos
Dry weight
parasitic diseases
Environmental Chemistry
Animals
Oligochaeta
Waste Management and Disposal
Ecosystem
0105 earth and related environmental sciences
Chemistry
Aquatic ecosystem
Sediment
Pollution
Benthic zone
Environmental chemistry
Bioaccumulation
Microcosm
Bioturbation
Water Pollutants, Chemical
Subjects
Details
- ISSN :
- 18791026
- Volume :
- 687
- Database :
- OpenAIRE
- Journal :
- The Science of the total environment
- Accession number :
- edsair.doi.dedup.....4630d5333b972ac49e8c5cfaa3fa12f5