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

Marine Pollution Bulletin
Catriona K MacleodNatalie A Moltschaniwskyj

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.

Citations

Jan 31, 2014·International Journal of Environmental Research and Public Health·Xiangju ChengLiangsheng Zhu
Jan 9, 2009·Marine Pollution Bulletin·Paolo TomassettiSalvatore Porrello
Jan 18, 2007·Environmental Microbiology·Andrew BissettJohn P Bowman
Jul 11, 2006·Marine Pollution Bulletin·Catriona K MacleodChristine M Crawford
May 20, 2014·Marine Pollution Bulletin·Mônica L Botter-CarvalhoPaulo J P Santos
Mar 6, 2012·Marine Pollution Bulletin·F Aguado-GiménezB García-García
Jan 20, 2006·FEMS Microbiology Ecology·Andrew BissettChris Burke
Feb 25, 2010·Environmental Science & Technology·Daniel J MayorKen Killham

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