Calcification rate and the stable carbon, oxygen, and nitrogen isotopes in the skeleton, host tissue, and zooxanthellae of bleached and recovering Hawaiian corals

Rodrigues, Lisa J.; Grottoli, Andréa G.

doi:10.1016/j.gca.2006.02.014

Cited by 115 publications

(160 citation statements)

References 55 publications

(102 reference statements)

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“…Hypothesis 1: d 13 C depletion upon the onset of compression bands Isotopic profiles across compression bands coincident with the 1998 bleaching event did not consistently show depletions in d 13 C, contrary to past studies (e.g., Porter et al 1989;Carriquiry et al 1994;Suzuki et al 2003;Grottoli et al 2004;Rodrigues and Grottoli 2006). Both enrichment and depletion of skeletal d 13 C occurred at the onset of compression bands in the four cores studied here (Fig.…”

Section: Long-term Trendscontrasting

confidence: 85%

“…These include seasonal changes in DIC of the surrounding seawater (Swart et al 1996); the isotopic composition of heterotrophically acquired energy sources (e.g., zooplankton; Grottoli 2002; Grottoli et al 2006;Rodrigues and Grottoli 2006); and selective sequestration of 12 C in gametes (summarized by Swart et al 1996). Relevant to the issue examined here is evidence that corals can respond to bleaching by increasing heterotrophic carbon acquisition .…”

Section: Long-term Trendsmentioning

confidence: 84%

“…Relevant to the issue examined here is evidence that corals can respond to bleaching by increasing heterotrophic carbon acquisition . Increased heterotrophy on isotopically depleted food sources (e.g., zooplankton) can deplete the skeletal d 13 C signal, an effect that drives the skeletal DIC pool d 13 C in the same direction as the loss of metabolic fractionation by zooxanthellae (Grottoli 2002;Grottoli et al 2006;Rodrigues and Grottoli 2006). Heterotrophic plasticity has not been examined in M. faveolata, but it is plausible that increased feeding alone or in synergy with loss of zooxanthellae can drive down the d 13 C signal during bleaching and recovery.…”

Section: Long-term Trendsmentioning

confidence: 99%

“…Inconsistent reports of the d 13 C response to bleaching across genera suggest that species-specific responses may also explain why skeletal d 13 C depletions are not consistently observed (e.g., Porites, Montipora; Porter et al 1989;Suzuki et al 2003;Grottoli et al 2004;Rodrigues and Grottoli 2006).…”

Section: Long-term Trendsmentioning

confidence: 99%

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Stable isotopic records of bleaching and endolithic algae blooms in the skeleton of the boulder forming coral Montastraea faveolata

et al. 2010

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Within boulder forming corals, fixation of dissolved inorganic carbon is performed by symbiotic dinoflagellates within the coral tissue and, to a lesser extent, endolithic algae within the coral skeleton. Endolithic algae produce distinctive green bands in the coral skeleton, and their origin may be related to periods of coral bleaching due to complete loss of dinoflagellate symbionts or ''paling'' in which symbiont populations are patchily reduced in coral tissue. Stable carbon isotopes were analyzed in coral skeletons across a known bleaching event and 12 blooms of endolithic algae to determine whether either of these types of changes in photosynthesis had a clear isotopic signature. Stable carbon isotopes tended to be enriched in the coral skeleton during the initiation of endolith blooms, consistent with enhanced photosynthesis by endoliths. In contrast, there were no consistent d 13 C patterns directly associated with bleaching, suggesting that there is no unique isotopic signature of bleaching. On the other hand, isotopic values after bleaching were lighter 92% of the time when compared to the bleaching interval. This marked drop in skeletal d 13 C may reflect increased kinetic fractionation and slow symbiont recolonization for several years after bleaching.

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Section: Long-term Trendscontrasting

confidence: 85%

Section: Long-term Trendsmentioning

confidence: 84%

Section: Long-term Trendsmentioning

confidence: 99%

Section: Long-term Trendsmentioning

confidence: 99%

See 2 more Smart Citations

Stable isotopic records of bleaching and endolithic algae blooms in the skeleton of the boulder forming coral Montastraea faveolata

et al. 2010

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“…If the temperature exceeds this threshold, the corals lose their dinoflagellate symbiont, zooxanthellae, in a process known as thermal bleaching. Without the photosynthetic products provided by the symbiont, many essential physiological processes, such as calcification and reproduction, are repressed (Rodrigues and Grottoli, 2006;Carilli et al, 2009;Cantin et al, 2010). Observations suggest there has been an increase in the frequency and intensity of mass coral bleaching events due to thermal stress over recent decades, resulting in an estimated loss in hard coral cover of approximately 18 % and a decline in the dominant populations at a rate of 1-2 % per year (Hoegh-Guldberg et al, 2011;Wilkinson, 2008).…”

Section: Introductionmentioning

confidence: 99%

Modelling coral calcification accounting for the impacts of coral bleaching and ocean acidification

et al. 2015

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Abstract. Coral reefs are diverse ecosystems that are threatened by rising CO 2 levels through increases in sea surface temperature and ocean acidification. Here we present a new unified model that links changes in temperature and carbonate chemistry to coral health. Changes in coral health and population are explicitly modelled by linking rates of growth, recovery and calcification to rates of bleaching and temperature-stress-induced mortality. The model is underpinned by four key principles: the Arrhenius equation, thermal specialisation, correlated up-and down-regulation of traits that are consistent with resource allocation trade-offs, and adaption to local environments. These general relationships allow this model to be constructed from a range of experimental and observational data. The performance of the model is assessed against independent data to demonstrate how it can capture the observed response of corals to stress. We also provide new insights into the factors that determine calcification rates and provide a framework based on wellknown biological principles to help understand the observed global distribution of calcification rates. Our results suggest that, despite the implicit complexity of the coral reef environment, a simple model based on temperature, carbonate chemistry and different species can give insights into how corals respond to changes in temperature and ocean acidification.

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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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Calcification rate and the stable carbon, oxygen, and nitrogen isotopes in the skeleton, host tissue, and zooxanthellae of bleached and recovering Hawaiian corals

Cited by 115 publications

References 55 publications

Stable isotopic records of bleaching and endolithic algae blooms in the skeleton of the boulder forming coral Montastraea faveolata

Stable isotopic records of bleaching and endolithic algae blooms in the skeleton of the boulder forming coral Montastraea faveolata

Modelling coral calcification accounting for the impacts of coral bleaching and ocean acidification

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

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