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Novel observations of benthic enrichment in contrasting flow regimes with implications for marine farm monitoring and management

Citation

Keeley, N and Forrest, B and MacLeod, C, Novel observations of benthic enrichment in contrasting flow regimes with implications for marine farm monitoring and management, Marine Pollution Bulletin, 66, (1-2) pp. 105-116. ISSN 0025-326X (2013) [Refereed Article]

Copyright Statement

Copyright 2012 Elsevier Ltd.

DOI: doi:10.1016/j.marpolbul.2012.10.024

Abstract

We examine macrofaunal and physico-chemical responses to organic enrichment beneath salmon farms in contrasting flow environments, and reveal pronounced flow-related differences in the magnitude and spatial extent of effects. Total macrofaunal abundances at high flow sites were nearly an order of magnitude greater than at comparable low flow sites, representing a significant benthic biomass. These very high abundances occurred in conjunction with moderate-to-high species richness, and were evident in the absence of appreciable organic matter accumulation. Biological responses to increasing sulfide were variable; however a significant biological threshold was evident at 1500 lM. Macrofaunal responses at high flow sites differed substantially from the Pearson–Rosenberg model. The atypical ecological conditions were attributed to (i) limited accumulation of fine sediments, (ii) maintenance of aerobic conditions in near-surface sediments, and (iii) an abundant food supply. Thus, enhanced resilience to organic waste at well-flushed sites appears related to both biological and physical processes.

Item Details

Item Type:Refereed Article
Keywords:Salmon Aquaculture Environmental impact Macrofauna Sulfide Pearson–Rosenberg model
Research Division:Agricultural and Veterinary Sciences
Research Group:Fisheries Sciences
Research Field:Aquaculture
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - Aquaculture
Objective Field:Fisheries - Aquaculture not elsewhere classified
Author:MacLeod, C (Associate Professor Catriona MacLeod)
ID Code:82969
Year Published:2013
Web of Science® Times Cited:13
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2013-02-25
Last Modified:2014-04-14
Downloads:0

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