Baseline shifts in coral skeletal oxygen isotopic composition: a signature of symbiont shuffling?

Carilli, Jessica; Charles, Christopher D.; Garren, Melissa; McField, Melanie; Norris, Richard D.

doi:10.1007/s00338-012-1004-y

Cited by 9 publications

(8 citation statements)

References 84 publications

(108 reference statements)

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“…In addition to the diagenesis, changes in physiological activity of symbionts caused by bleaching events also need to be considered. For example, Carilli et al () found a 0.3% difference in coral δ 18 O between the preknown and postknown coral bleaching event in the Turneffe Atoll and Cayos Cochinos coral cores and thought that skeletal δ 18 O may be affected by changes in coral symbiont (Carilli et al, ). In this study, however, there was no obvious change between the growth prehiatus and posthiatus nor were there any obvious changes in growth just prior to the mortality surface (see Figure ).…”

Section: Discussionmentioning

confidence: 99%

Evidence for the Thermal Bleaching of Porites Corals From 4.0 ka B.P. in the Northern South China Sea

Tao

et al. 2018

JGR Biogeosciences

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Coral bleaching is becoming a serious issue for coral reefs under the stress of global warming. However, whether it has occurred in the past in times of thermal stress remains unclear. Moreover, an understanding of historic coral bleaching events would greatly improve our insight into the adaptive capabilities of corals under such stresses. It is known that Porites corals, a massive coral, have relatively high levels of symbiotic zooxanthellae and a strong thermal tolerance when compared with most other corals (and particularly branched corals). Thus, growth hiatuses and/or mortality surfaces of fossil Porites may be used to indicate past ecological or environmental stress events, such as severe bleaching. In this study, monthly geochemical and isotopic environmental proxies of four fossil Porites corals with well‐preserved growth hiatuses and mortality surfaces (aged 3,800–4,200 years before 2013 A.D.), collected from Wenchang fringing reef, Hainan Island, Northern South China Sea were analyzed. Specifically, the Sr/Ca, δ18O, and δ13C were measured with a monthly resolution for each sample. These environmental proxies were used to reconstruct the sea surface temperature (SST), sea surface salinity (SSS), and physiological activity of the coral at the time when the growth hiatuses and/or mortality surfaces occurred. These data were subsequently used to determine the causes of coral mortality and growth discontinuity in each case. The results show that growth hiatuses and mortalities mainly occurred in summer, with high SST (31–34°C) and SSS (32.8–38.4). In addition, abrupt negative shifts of 2–3‰ in δ13C were observed in almost all of the surfaces of growth hiatus and mortality, indicating a dramatically reduced level of photosynthetic activity in symbiotic zooxanthellae. Because of the above reasons, we conclude that the frequently observed mortality and growth discontinuity of Porites corals from the mid‐Holocene is evidence for thermal bleaching events in the past. That is, coral bleaching has occurred 3,800–4,200 years ago and is not a new phenomenon.

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Section: Discussionmentioning

confidence: 99%

Evidence for the Thermal Bleaching of Porites Corals From 4.0 ka B.P. in the Northern South China Sea

Tao

et al. 2018

JGR Biogeosciences

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“…Since it is uncertain whether the primary variable affecting kinetic isotope effects is extension rate, calcification rate, or density (Heikoop et al, 2000), the data correction may or may not account for this discrepancy among different qualitative measurements for coral growth. Further, changes in endosymbiont type may influence d 18 O s (Carilli et al, 2013). Coral bleaching can be accompanied by changes in endosymbiont type (e.g.…”

Section: Evaluation Of the D 13 C S Data Correctionmentioning

confidence: 98%

Kinetic and metabolic isotope effects in coral skeletal carbon isotopes: A re-evaluation using experimental coral bleaching as a case study

Schoepf

Levas

Rodrigues

et al. 2014

Geochimica et Cosmochimica Acta

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“…It has also been proposed that physiological differences among symbiotic algal phylotypes may influence the stable isotopic composition of coral skeleton50. Furthermore, the distinct mechanisms used to concentrate carbon by different Symbiodinium phylotypes and their physiological responses to OA are phylotype- specific51.…”

Section: Resultsmentioning

confidence: 99%

Changes in microbial communities, photosynthesis and calcification of the coral Acropora gemmifera in response to ocean acidification

Zhou

Yuan

Lin

et al. 2016

Sci Rep

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With the increasing anthropogenic CO2 concentration, ocean acidification (OA) can have dramatic effects on coral reefs. However, the effects of OA on coral physiology and the associated microbes remain largely unknown. In the present study, reef-building coral Acropora gemmifera collected from a reef flat with highly fluctuating environmental condition in the South China Sea were exposed to three levels of partial pressure of carbon dioxide (pCO2) (i.e., 421, 923, and 2070 μatm) for four weeks. The microbial community structures associated with A. gemmifera under these treatments were analyzed using 16S rRNA gene barcode sequencing. The results revealed that the microbial community associated with A. gemmifera was highly diverse at the genus level and dominated by Alphaproteobacteria. More importantly, the microbial community structure remained rather stable under different pCO2 treatments. Photosynthesis and calcification in A. gemmifera, as indicated by enrichment of δ18O and increased depletion of δ13C in the coral skeleton, were significantly impaired only at the high pCO2 (2070 μatm). These results suggest that A. gemmifera can maintain a high degree of stable microbial communities despite of significant physiological changes in response to extremely high pCO2.

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Baseline shifts in coral skeletal oxygen isotopic composition: a signature of symbiont shuffling?

Cited by 9 publications

References 84 publications

Evidence for the Thermal Bleaching of Porites Corals From 4.0 ka B.P. in the Northern South China Sea

Evidence for the Thermal Bleaching of Porites Corals From 4.0 ka B.P. in the Northern South China Sea

Kinetic and metabolic isotope effects in coral skeletal carbon isotopes: A re-evaluation using experimental coral bleaching as a case study

Changes in microbial communities, photosynthesis and calcification of the coral Acropora gemmifera in response to ocean acidification

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