Morphological plasticity of the coral skeleton under CO2-driven seawater acidification

Tambutté, Éric; Venn, A.A.; Holcomb, Michael; Segonds, N.; Techer, N.; Zoccola, Didier; Allemand, Denis; Tambutté, Sylvie

doi:10.1038/ncomms8368

Cited by 157 publications

(199 citation statements)

References 45 publications

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“…If correct, this hypothesis would suggest that P. lutea has a stronger capacity than M. aequituberculata to alter skeletal porosity in order to maintain linear extension. Stylophora pistillata, for example, exploits this strategy when growing at low pH (7.2), which results in depressed calcification, by increasing skeletal porosity (Tambutté et al 2015). A similar trend has been reported for the temperate coral Balanophyllia europaea (Fantazzini et al 2015).…”

Section: Discussionsupporting

confidence: 51%

Effects of pCO2 on spatial competition between the corals Montipora aequituberculata and Porites lutea

Evensen¹,

Edmunds²,

Sakai³

2015

Mar. Ecol. Prog. Ser.

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We tested the hypothesis that ocean acidification (OA) affects spatial competition among scleractinian corals. Competitive ability was evaluated indirectly by linear extension of Porites lutea and Montipora aequituberculata placed in intraspecific, interspecific, and control pairings (paired with dead coral skeleton) and exposed to ambient (~400 µatm) and elevated (~1000 µatm) pCO 2 in experiments conducted in Moorea, French Polynesia, and Okinawa, Japan. High pCO 2 had no effect on linear extension of M. aequituberculata in Moorea, but in Okinawa, it reduced linear extension 37%; high pCO 2 had no significant effect on linear extension of P. lutea in Okinawa. Much of the negative effect of high pCO 2 on linear extension for M. aequituberculata in Okinawa was due to reduced extension in control pairings, with corals engaged in intra-and interspecific competition unaffected by OA. Linear extension of M. aequituberculata and P. lutea in interspecific pairings decreased relative to control pairings at ambient pCO 2 by 39 and 71%, respectively, indicating a strong effect of competition on extension rates. These differences however disappeared at elevated pCO 2 when the linear extension of controls was depressed. Together, our results show that OA can negatively affect the linear extension of corals not engaged in competition, as shown in the control pairings, and suggest that OA does not directly affect the ability of corals to compete with one another for space.

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Section: Discussionsupporting

confidence: 51%

Effects of pCO2 on spatial competition between the corals Montipora aequituberculata and Porites lutea

Evensen¹,

Edmunds²,

Sakai³

2015

Mar. Ecol. Prog. Ser.

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“…A change in morphology during incubation at elevated pCO 2 conditions was also observed for the tropical scleractinian coral species S. pistillata (Tambutte et al, 2015). Tambutte and colleagues found that these morphological alterations were accompanied by an increased incorporation of organic matrix proteins into the skeleton, which was suggested to occur to facilitate calcification at lower aragonite saturation by catalysing the precipitation of new aragonite crystals (Mass et al, 2013).…”

Section: Morphological Alterationsmentioning

confidence: 73%

Interactive Effects of Ocean Acidification and Warming on Growth, Fitness and Survival of the Cold-Water Coral Lophelia pertusa under Different Food Availabilities

2017

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Cold-water corals are important bioengineers that provide structural habitat for a diverse species community. About 70% of the presently known scleractinian cold-water corals are expected to be exposed to corrosive waters by the end of this century due to ocean acidification. At the same time, the corals will experience a steady warming of their environment. Studies on the sensitivity of cold-water corals to climate change mainly concentrated on single stressors in short-term incubation approaches, thus not accounting for possible long-term acclimatisation and the interactive effects of multiple stressors. Besides, preceding studies did not test for possible compensatory effects of a change in food availability. In this study a multifactorial long-term experiment (6 months) was conducted with end-of-the-century scenarios of elevated pCO 2 and temperature levels in order to examine the acclimatisation potential of the cosmopolitan cold-water coral Lophelia pertusa to future climate change related threats. For the first time multiple ocean change impacts including the role of the nutritional status were tested on L. pertusa with regard to growth, "fitness," and survival. Our results show that while L. pertusa is capable of calcifying under elevated CO 2 and temperature, its condition (fitness) is more strongly influenced by food availability rather than changes in seawater chemistry. Whereas growth rates increased at elevated temperature (+4 • C), they decreased under elevated CO 2 concentrations (∼800 µatm). No difference in net growth was detected when corals were exposed to the combination of increased CO 2 and temperature compared to ambient conditions. A 10-fold higher food supply stimulated growth under elevated temperature, which was not observed in the combined treatment. This indicates that increased food supply does not compensate for adverse effects of ocean acidification and underlines the importance of considering the nutritional status in studies investigating organism responses under environmental changes.

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“…Since coral calyces have complex 3-D shape such that their skeletal surface area is actually much greater than the planar area of the colony surface (Barnes, 1970), this implies that calcifying surface area is an important factor in determining coral calcification rates and it complicates the use of bulk calcification rates for estimating Ar (Raybaud et al, 2017). Multiple studies using micro-CT have shown increases in porosity and surface-area : volume ratios in corals cultured under elevated CO 2 levels (Tambutté et al, 2015;Foster et al, 2016). This may represent a strategy for controlling calcifying surface area (i.e.…”

Section: Discussionmentioning

confidence: 99%

Coral calcifying fluid aragonite saturation states derived from Raman spectroscopy

DeCarlo¹,

D’Olivo²,

Foster³

et al. 2017

Biogeosciences

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Abstract. Quantifying the saturation state of aragonite ( Ar ) within the calcifying fluid of corals is critical for understanding their biomineralization process and sensitivity to environmental changes including ocean acidification. Recent advances in microscopy, microprobes, and isotope geochemistry enable the determination of calcifying fluid pH and [CO ]/K sp ) has proved elusive. Here we test a new technique for deriving Ar based on Raman spectroscopy. First, we analysed abiogenic aragonite crystals precipitated under a range of Ar from 10 to 34, and we found a strong dependence of Raman peak width on Ar with no significant effects of other factors including pH, Mg/Ca partitioning, and temperature. Validation of our Raman technique for corals is difficult because there are presently no direct measurements of calcifying fluid Ar available for comparison. However, Raman analysis of the international coral standard JCp-1 produced Ar of 12.3 ± 0.3, which we demonstrate is consistent with published skeletal Mg/Ca, Sr/Ca, B/Ca, δ 11 B, and δ 44 Ca data. Raman measurements are rapid (≤ 1 s), high-resolution (≤ 1 µm), precise (derived Ar ± 1 to 2 per spectrum depending on instrument configuration), accurate ( ±2 if Ar < 20), and require minimal sample preparation, making the technique well suited for testing the sensitivity of coral calcifying fluid Ar to ocean acidification and warming using samples from natural and laboratory settings. To demonstrate this, we also show a high-resolution time series of Ar over multiple years of growth in a Porites skeleton from the Great Barrier Reef, and we evaluate the response of Ar in juvenile Acropora cultured under elevated CO 2 and temperature.

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Morphological plasticity of the coral skeleton under CO2-driven seawater acidification

Cited by 157 publications

References 45 publications

Effects of pCO2 on spatial competition between the corals Montipora aequituberculata and Porites lutea

Effects of pCO2 on spatial competition between the corals Montipora aequituberculata and Porites lutea

Interactive Effects of Ocean Acidification and Warming on Growth, Fitness and Survival of the Cold-Water Coral Lophelia pertusa under Different Food Availabilities

Coral calcifying fluid aragonite saturation states derived from Raman spectroscopy

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