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MEPS 276:53-70 (2004)
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Abstract
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Influence of an Antarctic waste dump on recruitment to nearshore marine soft-sediment assemblages
Jonathan S. Stark1,*, Martin J. Riddle1, Stephen D. A. Smith2,3
1Australian Antarctic Division, Department of the Environment and Heritage, Channel Highway, Kingston, 7050 Tasmania, Australia
2School of Environmental Sciences and Natural Resource Management, University of New England, Armidale, 2351 New South Wales, Australia
3National Marine Science Centre, Bay Drive, Charlesworth Bay, Coffs Harbour, 2450 New South Wales, Australia
*Email: jonny.stark@aad.gov.au
ABSTRACT: Abandoned waste dumps in Antarctica pose an environmental hazard due to contaminant mobilisation in marine and terrestrial habitats. At Casey Station, east Antarctica, a shoreline waste dump has contaminated adjacent marine sediments with
metals, hydrocarbons and organic carbon. This study experimentally assessed a model whereby contamination of marine sediment can lead to changes in recruitment and differences in soft-sediment assemblages. We tested the hypotheses that recruitment would
be different at disturbed 'station' locations compared to controls and different in contaminated sediment compared to control sediment. We conducted 2 reciprocal sediment-transplant field experiments over 2 consecutive years in which defaunated sediments
were deployed at disturbed locations and control locations and were recovered after 9 mo (March to November: winter), and also after 12 mo. The majority of fauna recruiting to the experiment were highly motile species with non-pelagic lecithotrophic
larvae, such as gammarids, tanaids, isopods and gastropods. There were large differences in recruiting assemblages between all locations and there were significant differences in recruitment between disturbed and control locations. Assemblages in
contaminated sediment were significantly different from those in control sediment. Differences in abundances of individual taxa between control and contaminated sediment were complex and difficult to interpret. Assemblages recruiting to the control
locations were more variable than those recruiting to disturbed locations. This study provides evidence that contaminants in marine sediments adjacent to the waste dump at Casey Station may be having an environmental impact.
KEY WORDS: Environmental impact · Waste dump · Pollution · Soft-sediment macrofauna · Recruitment · Antarctica
Full text in pdf format
Published in MEPS Vol.
276
(2004) on August 2
Print ISSN: 0171-8630; Online ISSN: 1616-1599.
Copyright © Inter-Research, Oldendorf/Luhe, 2004
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