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Effects of chronic low carbonate saturation levels on the distribution, growth and skeletal chemistry of deep-sea corals and other seamount megabenthos
Citation
Thresher, RE and Tilbrook, BD and Fallon, S and Wilson, NC and Adkins, J, Effects of chronic low carbonate saturation levels on the distribution, growth and skeletal chemistry of deep-sea corals and other seamount megabenthos, Marine Ecology - Progress Series, 442 pp. 87-99. ISSN 0171-8630 (2011) [Refereed Article]
Copyright Statement
Copyright Inter-Research 2011
Abstract
Ocean acidification has been predicted to reduce the ability of marine organisms to produce carbonate skeletons, threatening their long-term viability and severely impacting marine ecosystems. Corals, as ecosystem engineers, have been identified as particularly vulnerable and important. To determine the sensitivity of corals and allied taxa to long-term exposure to very low carbonate concentrations, we examined the distribution and skeletal characteristics of coral taxa along a natural deep-sea concentration gradient on seamounts of SW Australia. Carbonate under-saturation had little evident effect on the depth distribution, growth or skeletal composition of live scleractinians or gorgonians, with corals growing, often abundantly, in waters as much as 20 to 30% under-saturated. Developmental anomalies in the deepest skeleton-forming anthozoan collected (an isidid gorgonian, at nearly 4 km depth) suggest an absolute low tolerance limit of about 40% under-saturation. Evidence for an effect of acidification on the accumulation of reef structure is ambiguous, with clear indications of dissolution of high-magnesium calcite (HMC) gorgonian skeletons at depths below 2300 m, but also abundant, old scleractinian skeletons well below the aragonite saturation horizon. The latter might be the result of ferromanganese deposition on exposed skeletons, which, however, may render them inhospitable for benthic organisms.
Item Details
Item Type: | Refereed Article |
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Keywords: | Mineralogy, Anthozoa, Echinoderm |
Research Division: | Earth Sciences |
Research Group: | Oceanography |
Research Field: | Chemical Oceanography |
Objective Division: | Environment |
Objective Group: | Climate and Climate Change |
Objective Field: | Effects of Climate Change and Variability on Australia (excl. Social Impacts) |
UTAS Author: | Tilbrook, BD (Dr Bronte Tilbrook) |
ID Code: | 80664 |
Year Published: | 2011 |
Web of Science® Times Cited: | 49 |
Deposited By: | CRC-Antarctic Climate & Ecosystems |
Deposited On: | 2012-11-07 |
Last Modified: | 2017-10-13 |
Downloads: | 0 |
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