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      Dispersal and assimilation of an aquaculture waste subsidy in a low productivity coastal environment

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      Marine Pollution Bulletin

      Elsevier BV

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          Abstract

          To understand dispersal and assimilation of aquaculture waste subsidies in a naturally low-productivity environment, we applied a novel, rapid transmethylation technique to analyse sediment and biota fatty acid composition. This technique was initially validated at Atlantic salmon farms in Macquarie Harbour, Australia, where sediments were collected at farm and control locations. Subsequently, sediment, benthic polychaete and zooplankton were sampled at sites 0, 50, 250, 500 and 1000m distant from multiple cages. Results demonstrated an acute deposition zone up to 50m from cages and a diffuse zone extending 500m from cages. Changes in sediment concentration of linoleic acid, oleic acid and total fatty acids were effective tracers of farm deposition. Bacterial biomarkers indicated that aquaculture waste stimulates bacterial productivity in sediments, with elevated biomarker concentrations also detected in benthic polychaetes. Overall, fatty acid analysis was a sensitive technique to characterize the benthic footprint of aquaculture influence.

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          Author and article information

          Journal
          Marine Pollution Bulletin
          Marine Pollution Bulletin
          Elsevier BV
          0025326X
          July 2017
          July 2017
          : 120
          : 1-2
          : 309-321
          Article
          10.1016/j.marpolbul.2017.05.042
          28535958
          © 2017

          https://www.elsevier.com/tdm/userlicense/1.0/

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