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Tolerance to long-term exposure of suspended benthic sediments and drill cuttings in the cold-water coral Lophelia pertusa

Journal article
Authors Ann I. Larsson
D van Oevelen
A Purser
L Thomsen
Published in Marine Pollution Bulletin
Volume 70
Issue 1-2
Pages 176-188
ISSN 0025-326X
Publication year 2013
Published at Department of Biological and Environmental Sciences, Tjärnö Marine Biological Laboratory
Pages 176-188
Language en
Links dx.doi.org/10.1016/j.marpolbul.2013...
Keywords cold-water corals lophelia pertusa sediment exposure drill cuttings growth larval survival scleractinian corals ne atlantic particulate matter northeast atlantic reef organisms rockall bank deep growth turbidity food
Subject categories Marine ecology

Abstract

The cold-water coral Lophelia pertusa was exposed to suspended particles (<63 mu m) for 12 weeks. Skeletal growth was significantly lower under exposure concentrations of similar to 25 mg l(-1) than similar to 5 mg l(-1) and there was a trend of lower growth rates when exposed to water-based drill cuttings than to natural benthic sediment. Polyp extension was less in corals exposed to higher material concentrations, which provides a possible explanation for observed skeletal growth differences between particle concentrations. Particle exposure had no significant impact on respiration or proportions of tissue and fatty acids in corals. The volume of additional cleaning mucus released by exposed corals was low and release did not significantly affect coral energy expenditure. Our results indicate that L. pertusa polyps can deal comparatively well with enhanced particle deposition rates and suspended matter concentrations. However, a small pilot experiment indicated that coral larvae might be particularly vulnerable to high particle concentrations. (c) 2013 Elsevier Ltd. All rights reserved.

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