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

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posted on 2023-05-16, 15:29 authored by Catriona MacLeodCatriona MacLeod, Christine CrawfordChristine Crawford, Moltschaniwskyj, NA
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. © 2004 Elsevier Ltd. All rights reserved.

History

Publication title

Marine Pollution Bulletin

Volume

49

Issue

1-2

Pagination

79-88

ISSN

0025-326X

Department/School

Institute for Marine and Antarctic Studies

Publisher

Pergamon, Elsevier Science Ltd

Place of publication

Oxford, England

Repository Status

  • Restricted

Socio-economic Objectives

Assessment and management of terrestrial ecosystems

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