Response of Acropora digitifera to ocean acidification: constraints from δ11B, Sr, Mg, and Ba compositions of aragonitic skeletons cultured under variable seawater pH

Tanaka, Kentaro; Holcomb, Michael; Takahashi, Ami; Kurihara, Haruko; Asami, Ryuji; Shinjo, Ryuichi; Sowa, Kohki; Rankenburg, Kai; Watanabe, Tsuyoshi; McCulloch, Malcolm T.

doi:10.1007/s00338-015-1319-6

Cited by 33 publications

(36 citation statements)

References 65 publications

(93 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Studies with cultured Pacific Porites spp. and Acropora digitifera and Atlantic Favia fragum have shown increase in Sr/Ca ratio (colder reconstructed SST) due to increase in pCO 2 , declining aragonite saturation, or decrease pH (Cohen et al, 2009;Tanaka et al, 2015;Cole et al, 2016). On the contrary, our results with aposymbiotic A. millepora primary polyp revealed a consistent decrease of the Sr/Ca ratio (warming bias) under OA conditions.…”

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

confidence: 56%

See 1 more Smart Citation

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.

View full text Add to dashboard Cite

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.

show abstract

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.

View full text Add to dashboard Cite

show abstract

“…Two hypotheses have been proposed to explain the impact of seawater p CO 2 on coral skeletal Sr/Ca26. Coral aragonite precipitates from an extracellular calcifying fluid enclosed in a semi-isolated space between the coral tissue and underlying skeleton, and corals increase the pH of this fluid (upregulate pH) above that of ambient seawater to promote high fluid aragonite saturation states favourable for skeletal precipitation.…”

Section: Resultsmentioning

confidence: 99%

“…With the exception of A. digitifera 26, these studies used addition of HCl or NaOH to manipulate seawater pH at constant seawater p CO 2 , consequently shifting other carbonate system parameters to unrealistic values29. Additionally, the short acclimation times (5–35 days) of three262728 of the four studies are probably insufficient to enable coral physiological responses e.g. changes in zooxanthellae density, to adapt to changes in environment.…”

mentioning

confidence: 99%

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

Cole¹,

Finch²,

Hintz³

et al. 2016

Sci Rep

View full text Add to dashboard Cite

Coral skeletal Sr/Ca is a palaeothermometer commonly used to produce high resolution seasonal sea surface temperature (SST) records and to investigate the amplitude and frequency of ENSO and interdecadal climate events. The proxy relationship is typically calibrated by matching seasonal SST and skeletal Sr/Ca maxima and minima in modern corals. Applying these calibrations to fossil corals assumes that the temperature sensitivity of skeletal Sr/Ca is conserved, despite substantial changes in seawater carbonate chemistry between the modern and glacial ocean. We present Sr/Ca analyses of 3 genotypes of massive Porites spp. corals (the genus most commonly used for palaeoclimate reconstruction), cultured under seawater pCO2 reflecting modern, future (year 2100) and last glacial maximum (LGM) conditions. Skeletal Sr/Ca is indistinguishable between duplicate colonies of the same genotype cultured under the same conditions, but varies significantly in response to seawater pCO2 in two genotypes of Porites lutea, whilst Porites murrayensis is unaffected. Within P. lutea, the response is not systematic: skeletal Sr/Ca increases significantly (by 2–4%) at high seawater pCO2 relative to modern in both genotypes, and also increases significantly (by 4%) at low seawater pCO2 in one genotype. This magnitude of variation equates to errors in reconstructed SST of up to −5 °C.

show abstract

“…For example, Sr/Ca is not only a sensitive proxy for seawater temperature, but also dependent on changes in the activity of the Ca 2+ ATPase and associated kinetic effects (Rayleigh fractionation) 17 . For instance, anomalous Sr/Ca coral values have been reported during periods of thermal stress 18–20 which Marshall and McCulloch 20 attributed to the inhibition of Ca 2+ ATPase.…”

Section: Introductionmentioning

confidence: 99%

Response of coral calcification and calcifying fluid composition to thermally induced bleaching stress

D’Olivo

McCulloch

2017

Sci Rep

View full text Add to dashboard Cite

Severe, global-scale thermal stress events like those of 1998 and 2016, are becoming more frequent and intense, potentially compromising the future of coral reefs. Here we report the effects of the 1998 bleaching event on coral calcification as well as the composition of the calcifying fluid (cf) from which corals precipitate their calcium carbonate skeletons. This was investigated by using the Sr/Ca, Li/Mg (temperature), and boron isotopes (δ11B) and B/Ca (carbonate chemistry) proxies in a Porites sp. coral. Following the summer of 1998 the coral exhibited a prolonged period (~18 months) of reduced calcification (~60%) and a breakdown in the seasonality of the geochemical proxies. However, the maintenance of elevated dissolved inorganic carbon (DICcf; >×2 seawater) and pHcf (>8.3 compared to seawater ~8.0) even during severe stress of 1998 indicate that a minimum threshold of high aragonite saturation state (Ωcf) of ~14 (~×4 seawater), is an essential pre-requisite for coral calcification. However, despite maintaining elevated levels of Ωcf even under severe stress, coral growth is still impaired. We attribute this to reductions in either the effective active volume of calcification and/or DICcf as bleaching compromises the photosynthetically fixed carbon pool available to the coral.

show abstract

Response of Acropora digitifera to ocean acidification: constraints from δ11B, Sr, Mg, and Ba compositions of aragonitic skeletons cultured under variable seawater pH

Cited by 33 publications

References 65 publications

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

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

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

Response of coral calcification and calcifying fluid composition to thermally induced bleaching stress

Contact Info

Product

Resources

About