Ocean acidification has no effect on thermal bleaching in the coral Seriatopora caliendrum

Wall, Christopher B.; Fan, Tung‐Yung; Edmunds, Peter J.

doi:10.1007/s00338-013-1085-2

Cited by 41 publications

(28 citation statements)

References 60 publications

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“…"Chlorophyll" is abbreviated as "Chl.". Data sources were: (Reynaud et al 2003;Anthony et al 2008;Marubini et al 2008;Hii et al 2009;Crawley et al 2010;Krief et al 2010;Godinot et al 2011;Houlbrèque et al 2012;Iguchi et al 2012;Kaniewska et al 2012;Ogawa et al 2013;Schoepf et al 2013;Tremblay et al 2013;Enochs et al 2014;Horwitz and Fine 2014;Wall et al 2014;Biscéré et al 2015;Towle et al 2015;Vogel et al 2015;Hoadley et al 2016;Noonan and Fabricius 2016;Baghdasarian et al 2017 (b) The cycle of seawater pCO 2 over a 24 hour period in each experimental combination of light and pCO 2 , colour-coded as Blue: low light, control pCO 2 ; Purple: high light, control pCO 2 ; Orange: low light, elevated pCO 2 ; Red: high light, elevated pCO 2 . Measurements were taken during the time intervals of 2200-2300 hr, 0400-0500 hr, 1000-1100 hr, and 1600-1700 hr.…”

Section: Discussionmentioning

confidence: 99%

“…Experimental evidence suggests that increased partial pressures of carbon dioxide in seawater can induce bleaching in corals , although the effect is debated (Wall et al 2014). Should the agency of acidification to cause bleaching be conclusively demonstrated, then long-term 21 st -century bleaching projections will need to take this effect into account (as per Kwiatkowski et al 2015).…”

Section: Is Acclimation An Issue?mentioning

confidence: 99%

“…The question of whether acidification causes coral bleaching has been debated for some time, due to conflicting results of experiments designed to address this question Wall et al 2014). In Chapter 4, a literature compilation identified that ocean acidification causes a statistically significant change in symbiont populations in 26% of experimental exposures in which symbiont densities were measured.…”

Section: Bleaching Under Acidificationmentioning

confidence: 99%

“…As the fertilisation effect of acidification may take some time to manifest, the application of heat stress for the entire time that corals are exposed to acidification could obscure such an effect, by continually exerting a strong downward pressure on symbiont population size. To my knowledge, Chapter 4 is the first study of the combined impacts of acidification and heat stress on symbiont populations in corals that has staged the introduction of the two factors with the above rationale in mind (Reynaud et al 2003;Anthony et al 2008;Anlauf et al 2011;Ogawa et al 2013;Schoepf et al 2013;Wall et al 2014;Hoadley et al 2016;Baghdasarian et al 2017), although one investigation of bleaching in corals via chlorophyll loss has used a staged introduction of acidification (21 days) then heat stress (Noonan and Fabricius 2016). Whilst the "CO 2 fertilisation" hypothesis was not supported by my experimental results, the finding that symbiont loss is induced by high acidification levels suggests that this experimental design will be relevant for the mechanistic investigation of symbiont loss under such conditions.…”

Section: 8mentioning

confidence: 99%

“…Associated research has detected changes in gene expression in the host (Kaniewska et al 2012) and symbiont (Crawley et al 2010), and changes in Symbiodinium concentrations in some coral species, but not others (Krief et al 2010;Wall et al 2014). …”

Section: Introductionmentioning

confidence: 99%

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Coral responses to temperature, irradiance and acidification stress: linking physiology to satellite remote sensing

Mason¹

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The success of the symbiosis of scleractinian corals with dinoflagellates of the genus Symbiodinium is highly dependent on the availability of sufficient, but not excess, light for photosynthesis. After decades of fundamental research into the effect of light on the coral-dinoflagellate symbiosis, an important practical application is emerging in remote monitoring of bleaching at coral reefs. Coral bleaching that originates with the dysfunction of photosynthesis can be either photoacclimatory, a controlled adjustment in response to environmental change, or it can be associated with photodamage, an uncontrolled response to environmental change. It is the latter that tends to lead to severe bleaching events that decrease the rate of carbon fixation, generate excessive oxygen radicals and may ultimately lead to coral death if unfavourable conditions persist. Current best practice methods for the prediction of coral bleaching use water temperature as detected via satellite, and predict the onset of coral bleaching accurately, but not the percent of corals bleached at a reef or the extent of the ensuing mortality.Due to its central role in causing photodamage, the use of light level (in addition to temperature) as a predictive variable may improve the accuracy of predictions of coral bleaching severity. The rate of photoacclimation affects the duration of elevated stress following an increase or decrease in incident light level and so it is potentially important for predicting the severity of coral bleaching.As coral reef management practitioners aim to predict bleaching and bleaching-induced mortality at entire reef locales, which are typically composed of a multi-species coral community, differences in coral physiological responses are of importance in designing accurate prediction methods. The interaction of high light and high temperature with a third stressor, ocean acidification, may influence coral bleaching, as ocean acidification changes oceanic chemical parameters that are key to cellular mechanisms of homeostasis and to dinoflagellate photosynthesis.Using multiple-stressor aquarium experiments, I investigated the photoacclimation rate in corals, differences in response to light and temperature stress among coral species, and the interaction of light, temperature and ocean acidification on coral bleaching onset and severity (at the colony scale). My investigation of photoacclimation (via 24 days of exposure to a large increase, a moderate increase, and a large decrease in light) in Acropora muricata and mounding Porites spp.indicated that the direction of light change and the water temperature influenced photoacclimation duration. However, the exact patterns were specific to the variable used to measure photoacclimation (for instance, changes in net areal photosynthesis, or changes in quantum 2 efficiency of photosystem II), with important ramifications for the development of a combined light and temperature bleaching prediction method.I investigated species-specific physiological responses in A. mu...

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Section: Discussionmentioning

confidence: 99%

Section: Is Acclimation An Issue?mentioning

confidence: 99%

Section: Bleaching Under Acidificationmentioning

confidence: 99%

Section: 8mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Coral responses to temperature, irradiance and acidification stress: linking physiology to satellite remote sensing

Mason¹

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Corals adapted to extreme and fluctuating seawater pH increase calcification rates and have unique symbiont communities

Tanvet

Camp

Sutton

et al. 2023

Ecology and Evolution

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Ocean acidification (OA) is a severe threat to coral reefs mainly by reducing their calcification rate. Identifying the resilience factors of corals to decreasing seawater pH is of paramount importance to predict the survivability of coral reefs in the future. This study compared corals adapted to variable pHT (i.e., 7.23–8.06) from the semi‐enclosed lagoon of Bouraké, New Caledonia, to corals adapted to more stable seawater pHT (i.e., 7.90–8.18). In a 100‐day aquarium experiment, we examined the physiological response and genetic diversity of Symbiodiniaceae from three coral species (Acropora tenuis, Montipora digitata, and Porites sp.) from both sites under three stable pHNBS conditions (8.11, 7.76, 7.54) and one fluctuating pHNBS regime (between 7.56 and 8.07). Bouraké corals consistently exhibited higher growth rates than corals from the stable pH environment. Interestingly, A. tenuis from Bouraké showed the highest growth rate under the 7.76 pHNBS condition, whereas for M. digitata, and Porites sp. from Bouraké, growth was highest under the fluctuating regime and the 8.11 pHNBS conditions, respectively. While OA generally decreased coral calcification by ca. 16%, Bouraké corals showed higher growth rates than corals from the stable pH environment (21% increase for A. tenuis to 93% for M. digitata, with all pH conditions pooled). This superior performance coincided with divergent symbiont communities that were more homogenous for Bouraké corals. Corals adapted to variable pH conditions appear to have a better capacity to calcify under reduced pH compared to corals native to more stable pH condition. This response was not gained by corals from the more stable environment exposed to variable pH during the 100‐day experiment, suggesting that long‐term exposure to pH fluctuations and/or differences in symbiont communities benefit calcification under OA.

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Differential carbon utilization and asexual reproduction under elevated pCO₂ conditions in the model anemone, Exaiptasia pallida, hosting different symbionts

Hoadley

Rollison

Pettay

et al. 2015

Limnology & Oceanography

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Here we report the effects of elevated pCO2 on the model symbiotic anemone Exaiptasia pallida and how its association with three different strains of the endosymbiotic dinoflagellate Symbiodinium minutum (ITS2‐type B1) affects its response. Exposure to elevated pCO2 (70.9 Pa) for 28 d led to an increased effective quantum yield of PSII in actinic light within two of the alga‐anemone combinations. Autotrophic carbon fixation, along with the rate of carbon translocated to the animal, were significantly elevated with high pCO2. Elevated pCO2 exposure also coincided with significantly greater asexual budding rates in all tested anemones. Further, differences in photochemistry and carbon translocation rates suggest subtle differences in the response to pCO2 among the three strains of S. minutum and their host anemones. This illustrates the potential for physiological diversity at the subspecies level for this ecologically important dinoflagellate. Positive alterations in photosynthesis, carbon utilization, and fitness within this model symbiosis suggest a potential benefit from ocean acidification (OA) not yet observed within corals, which may enable these anthozoans to gain a greater ecological presence under future OA conditions.

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Ocean acidification has no effect on thermal bleaching in the coral Seriatopora caliendrum

Cited by 41 publications

References 60 publications

Coral responses to temperature, irradiance and acidification stress: linking physiology to satellite remote sensing

Coral responses to temperature, irradiance and acidification stress: linking physiology to satellite remote sensing

Corals adapted to extreme and fluctuating seawater pH increase calcification rates and have unique symbiont communities

Differential carbon utilization and asexual reproduction under elevated pCO₂ conditions in the model anemone, Exaiptasia pallida, hosting different symbionts

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Ocean acidification has no effect on thermal bleaching in the coral Seriatopora caliendrum

Cited by 41 publications

References 60 publications

Coral responses to temperature, irradiance and acidification stress: linking physiology to satellite remote sensing

Coral responses to temperature, irradiance and acidification stress: linking physiology to satellite remote sensing

Corals adapted to extreme and fluctuating seawater pH increase calcification rates and have unique symbiont communities

Differential carbon utilization and asexual reproduction under elevated pCO2 conditions in the model anemone, Exaiptasia pallida, hosting different symbionts

Contact Info

Product

Resources

About

Differential carbon utilization and asexual reproduction under elevated pCO₂ conditions in the model anemone, Exaiptasia pallida, hosting different symbionts