| Abstract: | We examined the bioavailability of mercury in sediments from the contaminated Sudbury River (Massachusetts, U.S.A.). Mayfly nymphs (Hexagenia) were exposed in four 21-day bioaccumulation tests to contaminated and reference sediments (treatments) from reservoirs, flowing reaches, palustrine wetlands, and a riverine lake. Mean total mercury (Sigma Hg) ranged from 880 to 22 059 ng.g dry weight(-1) in contaminated sediments and from 90 to 272 ng.g(-1) in reference sediments. Mean final concentrations of methyl mercury (MeHg) in test water were greatest (8-47 ng Hg.L-1) in treatments with contaminated wetland sediments, which had mean Sigma Hg ranging from 1200 to 2562 ng.g(-1). In mayflies, final mean concentrations of MeHg were highest in treatments with contaminated wetland sediments (122-183 ng Hg.g(-1)), intermediate in treatments with contaminated sediments from reservoirs, flowing reaches, and a riverine lake (75-127 ng Hg.g(-1)), and lowest in treatments with reference sediments (32-41 ng Hg.g(-1)). We conclude that the potential entry of MeHg into the benthic food chain was greater in contaminated palustrine wetlands than in the contaminated reservoirs, which had the most contaminated sediments. |
| Genre: | Article |
| ProdID: | 1002984 |
| Citation Author: | Naimo, T. J.; Wiener, J. G.; Cope, W. G.; Bloom, N. S. |
| Citation Contributing Office: | Upper Midwest Environmental Sciences Center |
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| Citation End Page: | 1102 |
| Citation Issue: | 5 |
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| Citation Language: | English |
| Citation Larger Work Title: | Canadian Journal of Fisheries and Aquatic Sciences |
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| Citation Number Of Pages: | 11 |
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| Citation Phsyical Description: | pp. 1092-1102 |
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| Citation Publisher: | U.S. Geological Survey |
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| Citation Search Results Text: | Bioavailability of sediment-associated mercury to Hexagenia mayflies in a contaminated floodplain river; 2000; Article; Journal; Canadian Journal of Fisheries and Aquatic Sciences; Naimo, T. J.; Wiener, J. G.; Cope, W. G.; Bloom, N. S. |
| Citation Start Page: | 1092 |
| Citation Volume: | 57 |
| Citation Year: | 2000 |
| Type: | citation/reference |
| Text: | Bioavailability of sediment-associated mercury to Hexagenia mayflies in a contaminated floodplain river; 2000; Article; Journal; Canadian Journal of Fisheries and Aquatic Sciences; Naimo, T. J.; Wiener, J. G.; Cope, W. G.; Bloom, N. S. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sat, 1 Jan 2000 00:00 -0600 |
| Publisher: | U.S. Geological Survey |
