Cumulative impacts: thermally bleached corals have reduced capacity to clear deposited sediment

Abstract The interaction between local, anthropogenic stressors, and larger scale regional/global stressors, is often used to explain the current poor condition of many corals reefs. This form of cumulative pressure is clearly manifested by situations where dredging projects happen to coincide with...

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Autores principales:	Pia Bessell-Browne, Andrew P. Negri, Rebecca Fisher, Peta L. Clode, Ross Jones
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/94fd3a7c7947492783051ebe94f3861f
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spelling	oai:doaj.org-article:94fd3a7c7947492783051ebe94f3861f2021-12-02T16:06:19ZCumulative impacts: thermally bleached corals have reduced capacity to clear deposited sediment10.1038/s41598-017-02810-02045-2322https://doaj.org/article/94fd3a7c7947492783051ebe94f3861f2017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-02810-0https://doaj.org/toc/2045-2322Abstract The interaction between local, anthropogenic stressors, and larger scale regional/global stressors, is often used to explain the current poor condition of many corals reefs. This form of cumulative pressure is clearly manifested by situations where dredging projects happen to coincide with marine heatwaves that have caused coral bleaching. A key pressure associated with dredging is elevated sedimentation. In this study, 3 coral species (Acropora millepora, Porites spp. and Turbinaria reniformis), representing three common morphologies (branching, massive and foliose respectively), were experimentally induced to bleach by exposure to a temperature of 31 °C for 21 d. The corals were then subjected to a range of sedimentation rates (0, 11, 22 and 40 mg cm−2 d−1), and their sediment-rejection ability quantified after 1 and 7 successive sediment deposition events. Bleached corals were less capable of removing sediments from their surfaces, and sediment accumulated 3 to 4-fold more than on normally-pigmented corals. Repeated deposition resulted in a ~3-fold increase in the amount of sediment remaining on the corals, regardless of bleaching status. These results suggest that adaptive management practices need to be developed to reduce the impacts of future dredging projects that follow or coincide with elevated sea surface temperatures and coral bleaching events.Pia Bessell-BrowneAndrew P. NegriRebecca FisherPeta L. ClodeRoss JonesNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-14 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Pia Bessell-Browne Andrew P. Negri Rebecca Fisher Peta L. Clode Ross Jones Cumulative impacts: thermally bleached corals have reduced capacity to clear deposited sediment
description	Abstract The interaction between local, anthropogenic stressors, and larger scale regional/global stressors, is often used to explain the current poor condition of many corals reefs. This form of cumulative pressure is clearly manifested by situations where dredging projects happen to coincide with marine heatwaves that have caused coral bleaching. A key pressure associated with dredging is elevated sedimentation. In this study, 3 coral species (Acropora millepora, Porites spp. and Turbinaria reniformis), representing three common morphologies (branching, massive and foliose respectively), were experimentally induced to bleach by exposure to a temperature of 31 °C for 21 d. The corals were then subjected to a range of sedimentation rates (0, 11, 22 and 40 mg cm−2 d−1), and their sediment-rejection ability quantified after 1 and 7 successive sediment deposition events. Bleached corals were less capable of removing sediments from their surfaces, and sediment accumulated 3 to 4-fold more than on normally-pigmented corals. Repeated deposition resulted in a ~3-fold increase in the amount of sediment remaining on the corals, regardless of bleaching status. These results suggest that adaptive management practices need to be developed to reduce the impacts of future dredging projects that follow or coincide with elevated sea surface temperatures and coral bleaching events.
format	article
author	Pia Bessell-Browne Andrew P. Negri Rebecca Fisher Peta L. Clode Ross Jones
author_facet	Pia Bessell-Browne Andrew P. Negri Rebecca Fisher Peta L. Clode Ross Jones
author_sort	Pia Bessell-Browne
title	Cumulative impacts: thermally bleached corals have reduced capacity to clear deposited sediment
title_short	Cumulative impacts: thermally bleached corals have reduced capacity to clear deposited sediment
title_full	Cumulative impacts: thermally bleached corals have reduced capacity to clear deposited sediment
title_fullStr	Cumulative impacts: thermally bleached corals have reduced capacity to clear deposited sediment
title_full_unstemmed	Cumulative impacts: thermally bleached corals have reduced capacity to clear deposited sediment
title_sort	cumulative impacts: thermally bleached corals have reduced capacity to clear deposited sediment
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/94fd3a7c7947492783051ebe94f3861f
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Cumulative impacts: thermally bleached corals have reduced capacity to clear deposited sediment

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