Understanding cold bias: Variable response of skeletal Sr/Ca to seawater pCO2 in acclimated massive Porites corals

Cole, Catherine; Finch, Adrian A.; Hintz, C. J.; Hintz, Kenneth J.; Allison, Nicola

doi:10.1038/srep26888

Cited by 25 publications

(52 citation statements)

References 61 publications

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“…Internal reproducibility was calculated from the standard deviation of 8 replicate measurements of a single sample (r/Hn) and was always B 0.1%. Multiple measurements of the CRM analysed as an unknown were in excellent agreement with the certified value (within 5 lmol kg -1 , Cole et al 2016).…”

Section: Monitoring Seawater Compositionsupporting

confidence: 62%

“…Corals were maintained in a purpose-built large-volume aquarium system constructed of low CO 2 permeability materials designed to control temperature, salinity and dissolved inorganic carbon (DIC) system parameters within narrow limits (see Cole et al 2016). Corals were housed in 21-l cast acrylic tanks, recirculated with seawater from high-density polyethylene reservoirs containing * 900 l of seawater.…”

Section: Coral Culturingmentioning

confidence: 99%

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Effects of seawater pCO2 and temperature on calcification and productivity in the coral genus Porites spp.: an exploration of potential interaction mechanisms

et al. 2018

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Understanding how rising seawater pCO 2 and temperatures impact coral aragonite accretion is essential for predicting the future of reef ecosystems. Here, we report 2 long-term (10-11 month) studies assessing the effects of temperature (25 and 28°C) and both high and low seawater pCO 2 (180-750 latm) on the calcification, photosynthesis and respiration of individual massive Porites spp. genotypes. Calcification rates were highly variable between genotypes, but high seawater pCO 2 reduced calcification significantly in 4 of 7 genotypes cultured at 25°C but in only 1 of 4 genotypes cultured at 28°C. Increasing seawater temperature enhanced calcification in almost all corals, but the magnitude of this effect was seawater pCO 2 dependent. The 3°C temperature increase enhanced calcification rate on average by 3% at 180 latm, by 35% at 260 latm and by [ 300% at 750 latm. The rate increase at high seawater pCO 2 exceeds that observed in inorganic aragonites. Responses of gross/net photosynthesis and respiration to temperature and seawater pCO 2 varied between genotypes, but rates of all these processes were reduced at the higher seawater temperature. Increases in seawater temperature, below the thermal stress threshold, may mitigate against ocean acidification in this coral genus, but this moderation is not mediated by an increase in net photosynthesis. The response of coral calcification to temperature cannot be explained by symbiont productivity or by thermodynamic and kinetic influences on aragonite formation.

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Section: Monitoring Seawater Compositionsupporting

confidence: 62%

Section: Coral Culturingmentioning

confidence: 99%

Effects of seawater pCO2 and temperature on calcification and productivity in the coral genus Porites spp.: an exploration of potential interaction mechanisms

et al. 2018

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“…Bias of reconstructed SST from coral Sr/Ca under OA has been previously documented Cole et al, 2016). Our findings of a SST warm bias (low Sr/Ca) between conditions 1 and 3 as well as conditions 2 and 4 are not in agreement with the SST cold bias (high Sr/Ca) results found by Tanaka et al (2015) and Cole et al (2016).…”

Section: Primary Polyp a Millepora Skeletal Sr/ca As Sst Proxycontrasting

confidence: 56%

“…Our findings of a SST warm bias (low Sr/Ca) between conditions 1 and 3 as well as conditions 2 and 4 are not in agreement with the SST cold bias (high Sr/Ca) results found by Tanaka et al (2015) and Cole et al (2016). Studies with cultured Pacific Porites spp.…”

Section: Primary Polyp a Millepora Skeletal Sr/ca As Sst Proxycontrasting

confidence: 54%

Primary Life Stage Boron Isotope and Trace Elements Incorporation in Aposymbiotic Acropora millepora Coral under Ocean Acidification and Warming

Dissard

Cornec

et al. 2017

Front. Mar. Sci.

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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 δ 11 B 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 δ 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.

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“…, Cole et al, 2016). Lighting of ~ 300 μmol photons m -2 s -1 was provided by Maxspect R420R 160w-10000k LED lamps on a 12h light: 12h dark cycle (with wavelength settings of 100% A and 20% B).…”

Section: Coral Culturingmentioning

confidence: 99%

The effect of ocean acidification on tropical coral calcification: insights from calcification fluid DIC chemistry

Allison¹

2018

Preprint

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Ocean acidification typically reduces calcification in tropical marine corals but the mechanism for this process is not understood. We use skeletal boron geochemistry (B/Ca and δ 11 B) to reconstruct the calcification fluid DIC of corals cultured over both high and low seawater pCO2 (180, 400 and 750 μatm). We observe strong positive correlations between calcification fluid pH and concentrations of the DIC species potentially implicated in aragonite precipitation (be they CO3 ). Similarly, with the exception of one outlier, the fluid concentrations of precipitating DIC species are strongly positively correlated with coral calcification rate. Corals cultured at high seawater pCO2 usually have low calcification fluid pH and low concentrations of precipitating DIC, suggesting that a reduction in DIC substrate at the calcification site is responsible for decreased calcification. The outlier coral maintained high pHCF and DICCF at high seawater pCO2 but exhibited a reduced calcification rate indicating that the coral has a limited energy budget to support proton extrusion from the calcification fluid and meet other calcification demands. We find no evidence that increasing seawater pCO2 enhances diffusion of CO2 into the calcification site. Instead the overlying [CO2] available to diffuse into the calcification site appears broadly comparable between seawater pCO2 treatments, implying that metabolic activity (respiration and photosynthesis) generates a similar [CO2] in the vicinity of the calcification site regardless of seawater pCO2.

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Understanding cold bias: Variable response of skeletal Sr/Ca to seawater pCO2 in acclimated massive Porites corals

Cited by 25 publications

References 61 publications

Effects of seawater pCO2 and temperature on calcification and productivity in the coral genus Porites spp.: an exploration of potential interaction mechanisms

Effects of seawater pCO2 and temperature on calcification and productivity in the coral genus Porites spp.: an exploration of potential interaction mechanisms

Primary Life Stage Boron Isotope and Trace Elements Incorporation in Aposymbiotic Acropora millepora Coral under Ocean Acidification and Warming

The effect of ocean acidification on tropical coral calcification: insights from calcification fluid DIC chemistry

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