eCite Digital Repository
Contaminated suspended sediments toxic to an Antarctic filter feeder: Aqueous- and particulate-phase effects
Citation
Hill, Nicole and King, CK and Perrett, LA and Johnston, EL, Contaminated suspended sediments toxic to an Antarctic filter feeder: Aqueous- and particulate-phase effects, Environmental Toxicology and Chemistry, 28, (2) pp. 409-417. ISSN 0730-7268 (2009) [Refereed Article]
![]() | PDF Restricted - Request a copy 120Kb |
Copyright Statement
The definitive published version is available online at: http://interscience.wiley.com
Official URL: http://interscience.wiley.com
DOI: doi:10.1897/08-328.1
Abstract
Disturbances such as dredging, storms, and bioturbation result in the resuspension of sediments. This may affect sessile organisms that live on hard substrates directly above the sediment. Localized sediment contamination exists around many Antarctic research stations, often resulting in elevated contamination loads in marine sediments. To our knowledge, the potential impact of resuspended contaminated sediments on sessile fauna has not been considered, so in the present study, we assessed the sensitivity of Antarctic spirorbid polychaetes to aqueous metals and to metal-contaminated sediments that had been experimentally resuspended. Worms were first exposed to aqueous metals, both singly and in combination, over 10 d. Spirorbid mortality was tolerant to copper (median lethal concentration [LC50], 570 g/L), zinc (LC50, >4,910 g/L), and lead (LC50, >2,905 g/L); however, spirorbid behavior responded to copper concentrations as low as 20g/L. When in combination, zinc significantly reduced mortality caused by copper. A novel technique was used to resuspend sediments spiked with four concentrations of three metals (up to 450 g/g dry wt of copper, 525 g/g dry wt of lead, and 2,035 g/g dry wt of zinc). The response of spirorbids to unfiltered suspended sediment solutions and filtered solutions (aqueous metal exposure) was measured. Suspended sediments were toxic to filter-feeding spirorbids at concentrations approximating those found in contaminated Antarctica areas. Toxicity resulted both from aqueous metals and from metals associated with the suspended sediments, although suspended clean sediments had no impact. To our knowledge, the present study is the first to show that resuspension of contaminated sediments can be an important pathway for toxicity to Antarctic hard substrate organisms. Based on the present results, current sediment-quality guidelines used in the evaluation of Australian sediments may be applicable to Antarctic ecosystems.
Item Details
Item Type: | Refereed Article |
---|---|
Keywords: | Spirorbid, Resuspended Heavy metals, Total suspended solids, Aqueous |
Research Division: | Environmental Sciences |
Research Group: | Environmental management |
Research Field: | Environmental management not elsewhere classified |
Objective Division: | Environmental Management |
Objective Group: | Management of Antarctic and Southern Ocean environments |
Objective Field: | Biodiversity in Antarctic and Southern Ocean environments |
UTAS Author: | Hill, Nicole (Dr Nicole Hill) |
ID Code: | 58239 |
Year Published: | 2009 |
Web of Science® Times Cited: | 32 |
Deposited By: | TAFI - Marine Research Laboratory |
Deposited On: | 2009-09-22 |
Last Modified: | 2010-12-07 |
Downloads: | 1 View Download Statistics |
Repository Staff Only: item control page