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Detection of organic enrichment near finfish net-pens by sediment profile imaging at SCUBA-accessible depths

Citation

Wildish, DJ and Hargrave, BT and MacLeod, C and Crawford, C, Detection of organic enrichment near finfish net-pens by sediment profile imaging at SCUBA-accessible depths, Journal of Experimental Marine Biology and Ecology, 285-286 pp. 403-413. ISSN 0022-0981 (2003) [Refereed Article]

DOI: doi:10.1016/S0022-0981(02)00540-3

Abstract

Sediment profile images (SPI) of cores collected by SCUBA diver were obtained using a modified Hargrave corer from fish farm sites in the Bay of Fundy, Canada and southeastern Tasmania, Australia. Shipboard and land based photography were used to obtain the SPI with a tripod mounted digital camera and image analysis by commercially available software. Computer images were analyzed to determine the variables used by Nilsson and Rosenberg [Mar. Ecol., Prog. Ser. 197 (2000) 139], modified to account for non-equilibrium conditions, to assess successional stages of organic enrichment. To validate the method, we concurrently sampled macrofaunal species composition and abundance and measured profiles of redox potentials and total sulphides by ion analysis. In each case, the null hypothesis that sediments collected directly under an active salmon net-pen were indistinguishable from a nearby reference site was rejected. The SPI method can successfully detect organic enrichment where impacts occur in soft sediments in geographically diverse locations. Crown Copyright © 2002 Published by Elsevier Science B.V. All rights reserved.

Item Details

Item Type:Refereed Article
Research Division:Agricultural and Veterinary Sciences
Research Group:Fisheries Sciences
Research Field:Aquaculture
Objective Division:Environment
Objective Group:Ecosystem Assessment and Management
Objective Field:Ecosystem Assessment and Management of Coastal and Estuarine Environments
Author:MacLeod, C (Associate Professor Catriona MacLeod)
Author:Crawford, C (Dr Christine Crawford)
ID Code:28545
Year Published:2003
Web of Science® Times Cited:23
Deposited By:TAFI - Marine Research Laboratory
Deposited On:2003-08-01
Last Modified:2011-11-04
Downloads:0

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