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Spatial and temporal dynamics in macrobenthos during recovery from salmon farm induced organic enrichment: when is recovery complete?

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Keeley, NB and Forrest, BM and Hopkins, GA and MacLeod, CK (2014) Spatial and temporal dynamics in macrobenthos during recovery from salmon farm induced organic enrichment: when is recovery complete? Marine Pollution Bulletin, - (-). ISSN 0025-326X (In Press)

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Abstract

This study documents eight years of benthic recovery at a highly impacted salmon farm. Substantial
recovery occurred in the first 2 years, and was assessed to be complete after 5 years. However, minor
differences were still evident, along with some on-going benthic instability, attributable to medium-scale
spatial movements and successional patterns of macrobenthos. Quantifying the endpoint of ‘recovery’
proved challenging due to: lack of a widely accepted definition, inherent variability in recovering sediments,
differing trajectories of impact and reference sites, and statistical challenges. More complex biotic
indices and metrics incorporating multiple variables were the most robust indicators. Statistical tests for
‘parallelism’ in the trajectories of Cage and Reference sites proved useful, but results were contingent
upon how the method was applied, and should therefore be used in conjunction with data-visualisation
methods. The study highlights the importance of a predetermined recovery endpoint, and using multiple
indicators and a weight-of-evidence assessment approach.

Item Type: Article
Keywords: Benthic ecology, Fallowing, Aquaculture, Remediation, Parallelism, BACI
Journal or Publication Title: Marine Pollution Bulletin
ISSN: 0025-326X
Identification Number - DOI: org/10.1016/j.marpolbul.2013.12.008
Additional Information:

Copyright 2014 Elsevier

Date Deposited: 11 Feb 2014 23:31
Last Modified: 18 Nov 2014 04:58
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