Temporal changes in the distribution, methylation, and bioaccumulation of newly deposited mercury in an aquatic ecosystem |
| |
Authors: | Orihel Diane M Paterson Michael J Blanchfield Paul J Bodaly R A Drew Gilmour Cynthia C Hintelmann Holger |
| |
Institution: | Clayton H. Riddell Faculty of Environment, Earth, and Resources, University of Manitoba, Winnipeg, Manitoba, R3T 2N2, Canada. orihel@ualberta.ca |
| |
Abstract: | Our objective was to examine how the behavior of atmospheric mercury (Hg) deposited to boreal lake mesocosms changed over time. We added inorganic Hg enriched in a different stable isotope in each of two years, which allowed us to differentiate between Hg added in the first and second year. Although inorganic Hg and methylmercury (MeHg) continued to accumulate in sediments throughout the experiment, the availability of MeHg to the food web declined within one year. This decrease was detected in periphyton, zooplankton, and water mites, but not in gomphid larvae, amphipods, or fish. We suggest that reductions in atmospheric Hg deposition should lead to decreases in MeHg concentrations in biota, but that changes will be more easily detected in short-lived pelagic species than long-lived species associated with benthic food webs. |
| |
Keywords: | Mercury isotope Atmospheric deposition Bioavailability Food web Fish |
本文献已被 ScienceDirect PubMed 等数据库收录! |
|