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Impact of the Iron Baron Oil Spill on Subtidal Reef Assemblages in Tasmania

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Barrett, NS and Edgar, GJ (2000) Impact of the Iron Baron Oil Spill on Subtidal Reef Assemblages in Tasmania. Marine Pollution Bulletin, 40 (1). pp. 36-49. ISSN 0025-326X

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Abstract

The biological impact of the grounding of the bulk carrier Iron Baron on Hebe Reef in northern Tasmania, with release of approximately 350 tonnes of Bunker C fuel oil, was assessed using quantitative underwater censuses at numerous reef sites before and after the spill. Physical abrasion from the ship's bull during grounding caused the complete destruction of the subtidal reef community within a localized area of 170 m by 20 m on Hebe Reef. However, the release of fuel oil did not appear to have substantially affected populations of subtidal reef- associated organisms in the near vicinity. Analyses of changes over time outside the hull impact area at oiled sites before and after the spill, and comparisons with un- disturbed reference sites, indicated no significant change in number of species on reefs or in densities of the most abundant animal and plant species. Post-impact moni- toring of the grounding zone and adjacent reference sites on Hebe Reef indicated that the &sh assemblage associ- ated with the hull scar recovered rapidly in terms of spe- cies composition and species richness within one year, whereas plant and invertebrate assemblages had not reached inferred pre-distufbance levels after two years. Wave disturbance appeared to be hindering re-establish- ment of large macroalgae over part of the abrasion zone where the reef substrata had been converted to unstable gravels.

Item Type: Article
Journal or Publication Title: Marine Pollution Bulletin
Page Range: pp. 36-49
ISSN: 0025-326X
Identification Number - DOI: 10.1016/S0025-326X(99)00101-0
Date Deposited: 22 Dec 2010 05:11
Last Modified: 18 Nov 2014 04:15
URI: http://eprints.utas.edu.au/id/eprint/10571
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