Primary life stage boron isotope and trace elements incorporation in aposymbiotic Acropora millepora coral under ocean acidification and warming

Wu, Henry C., Dissard, Delphine, Le Cornec, Florence, Thil, François, Tribollet, Aline, Moya, Aurelie, and Douville, Eric (2017) Primary life stage boron isotope and trace elements incorporation in aposymbiotic Acropora millepora coral under ocean acidification and warming. Frontiers in Marine Science, 4. 129.

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Early-life stages of reef-building corals are vital to coral existence and reef maintenance. It is therefore crucial to study juvenile coral response to future climate change pressures. Moreover, corals are known to be reliable recorders of environmental conditions in their skeletal materials. Aposymbiotic Acropora millepora larvae were cultured in different seawater temperature (27 and 29°C) and pCO 2 (390 and 750 μatm) conditions to understand the impacts of "end of century" ocean acidification (OA) and ocean warming (OW) conditions on skeletal morphology and geochemistry. The experimental conditions impacted primary polyp juvenile coral skeletal morphology and growth resulting in asymmetric translucent appearances with brittle skeleton features. The impact of OA resulted in microstructure differences with decreased precipitation or lengthening of fasciculi and disorganized aragonite crystals that led to more concentrations of centers of calcifications. The coral skeletal d11B composition measured by laser ablation MC-ICP-MS was significantly affected by pCO 2 (p = 0.0024) and water temperature (p = 1.46 × 10 -5 ). Reconstructed pH of the primary polyp skeleton using the σ 11 B proxy suggests a difference in coral calcification site and seawater pH consistent with previously observed coral pH up-regulation. Similarly, trace element results measured by laser ablation ICP-MS indicate the impact of pCO 2 . Primary polyp juvenile Sr/Ca ratio indicates a bias in reconstructed sea surface temperature (SST) under higher pCO 2 conditions. Coral microstructure content changes (center of calcification and fasciculi) due to OA possibly contributed to the variability in B/Ca ratios. Our results imply that increasing OA and OW may lead to coral acclimation issues and species-specific inaccuracies of the commonly used Sr/Ca-SST proxy.

Item ID: 54144
Item Type: Article (Research - C1)
ISSN: 2296-7745
Keywords: Acropora millepora, laser ablation, ocean acidification, pH proxy, Scleractinian corals, sea surface temperature proxies, Sr/Ca, σ B 11
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© 2017 Wu, Dissard, Le Cornec, Thil, Tribollet, Moya and Douville. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

Funders: Institute Pierre Simon Laplace, French National Research Agency (ANR), Marie Curie Outgoing International Fellowship (MC)
Projects and Grants: ANR Grant no. ANR-10-LABX-001, MC # PIOF-GA-2008-23514
Date Deposited: 19 Jun 2018 00:17
FoR Codes: 31 BIOLOGICAL SCIENCES > 3103 Ecology > 310305 Marine and estuarine ecology (incl. marine ichthyology) @ 100%
SEO Codes: 96 ENVIRONMENT > 9603 Climate and Climate Change > 960305 Ecosystem Adaptation to Climate Change @ 100%
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