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Assessment of long term change in sediment condition after organic enrichment: defining recovery

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MacLeod, CK and Crawford, CM and Moltschaniwskyj, NA (2004) Assessment of long term change in sediment condition after organic enrichment: defining recovery. Marine Pollution Bulletin, 49 (1-2). pp. 79-88. ISSN 0025-326X

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Abstract

Sediment condition at an Atlantic salmon (Salmo salar) culture site in S.E. Tasmania, Australia was evaluated to determine the rate and extent of recovery after removal of farmed fish. By local standards the cage sediment at the start of this survey was markedly degraded but comparison with results from impact studies in Scotland, Canada and Norway suggests that the sediments were considerably less impacted than in northern temperate areas. The impact at the cages diminished rapidly with both time and distance; after only 2 months conditions were markedly improved. The macrobenthos indicated a slower recovery than chemical measures, after 36 months the benthic faunal community structure under the cages still differed from reference conditions even though other sediment measures had recovered. This study highlighted two other key issues in relation to monitoring and management of sediment recovery. First, techniques used to determine impact may not be appropriate for evaluation of recovery. Second, establishment of local baseline standards is extremely important to ensure appropriate evaluation of both impact and recovery.

Item Type: Article
Keywords: Sediment recovery; Environmental assessment; Monitoring; Organic enrichment; Aquaculture; Video
Journal or Publication Title: Marine Pollution Bulletin
Page Range: pp. 79-88
ISSN: 0025-326X
Identification Number - DOI: 10.1016/j.marpolbul.2004.01.010
Additional Information: The definitive version is available at http://www.sciencedirect.com
Date Deposited: 19 Jun 2008 02:57
Last Modified: 18 Nov 2014 03:42
URI: http://eprints.utas.edu.au/id/eprint/6631
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