Nickel and ocean warming affect scleractinian coral growth

Biscéré, Tom; Lorrain, Anne; Rodolfo‐Metalpa, Riccardo; Gilbert, Antoine; Wright, Anthony D.; Devissi, C.; Peignon, Christophe; Farman, Richard; Duvieilbourg, Eric; Payri, Claude; Houlbrèque, Fanny

doi:10.1016/j.marpolbul.2017.05.025

Cited by 33 publications

(19 citation statements)

References 57 publications

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“…Hence, the great variety of CDOM sources and of transformation processes makes the coastal CDOM a complex and heterogeneous pool of organic molecules displaying a broad range of structure and reactivity (Benner et al, 2005;Cao et al, 2016). Whereas most research dealing with the dynamics of CDOM in coastal waters has focused on temperate or high latitude environments, the sources and dynamics of CDOM in tropical coral reef areas remain much less known (Tedetti et al, 2011;Rochelle-Newall et al, 2014;Nelson et al, 2015), although tropical environments have received special attention in recent years due to coral bleaching in the context of global change (Weishaar et al, 2003;Biscéré et al, 2017;Wolanski et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…Due to their shoreline location, eroded ultramafic materials are directly transported to the lagoon, as evidenced by remote sensing or in situ measurements. Continuous releasing of trace metals from these ultramafic materials has durably impacted the lagoon ecosystem (Labrosse et al, 2000), including geochemical signatures on the shoreline (Fernandez et al, 2006), sediments and porewater in mangrove swamps (Marchand et al, 2011), benthic populations (Hédouin et al, 2011) and coral reef (Biscéré et al, 2017). No CDOM or trace metal measurements have however yet been conducted in the eastern lagoon of New Caledonia.…”

Section: Introductionmentioning

confidence: 99%

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Characterization and sources of colored dissolved organic matter in a coral reef ecosystem subject to ultramafic erosion pressure (New Caledonia, Southwest Pacific)

Martias

Tedetti

Lantoine

et al. 2018

Science of The Total Environment

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The eastern lagoon of New Caledonia (NC, Southwest Pacific), listed as a UNESCO World Heritage site, hosts the world's second longest double-barrier coral reef. This lagoon receives river inputs, oceanic water arrivals, and erosion pressure from ultramafic rocks, enriched in nickel (Ni) and cobalt (Co). The aim of this study was to characterize colored dissolved organic matter (CDOM), as well as to determine its main sources and its possible relationships (through the use of Pearson correlation coefficients, r) with biogeochemical parameters, plankton communities and trace metals in the NC eastern lagoon. Water samples were collected in March 2016 along a series of river/lagoon/open-ocean transects. The absorption coefficient at 350nm (a) revealed the influence of river inputs on the CDOM distribution. The high values of spectral slope (S, >0.03m) and the low values of specific ultraviolet absorbance (SUVA, <4Lmg-Cm) highlighted the photodegradation of CDOM in surface waters. The application of parallel factor analysis (PARAFAC) on excitation-emission matrices (EEMs) allowed the identification of four CDOM components: (1) one humic- and one tyrosine-like fluorophores. They had terrestrial origin, exported through rivers and undergoing photo- and bio-degradation in the lagoon. These two fluorophores were linked to manganese (Mn) in southern rivers (r=0.46-0.50, n=21, p<0.05). (2) A tryptophan-like fluorophore, which exhibited higher levels offshore. It would be potentially released from the coral reef. (3) A second tyrosine-like ("tyrosine 2-like") fluorophore. Linked to Prochlorococcus cyanobacteria (r=0.39, n=47, p<0.05), this fluorophore would have an oceanic origin and enter in the lagoon through its southern and northern extremities. It also displayed relationships with Ni and Co content (r=0.53-0.54, n=21, p<0.05). This work underlines the diversity of CDOM sources in the NC eastern lagoon.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Characterization and sources of colored dissolved organic matter in a coral reef ecosystem subject to ultramafic erosion pressure (New Caledonia, Southwest Pacific)

Martias

Tedetti

Lantoine

et al. 2018

Science of The Total Environment

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“…Experimental studies have emphasized the harmful effect of high concentrations of metals on coral reproduction and early life stages 19 – 24 . The only three studies which have focused on the combined effects of thermal stress and metal pollution (copper and nickel) 12 , 25 , 26 , have highlighted an increased bleaching susceptibility of adult corals under metal pollution 13 , 26 and a reduced thermal tolerance of coral larvae 25 .…”

Section: Introductionmentioning

confidence: 99%

Evidence for mitigation of coral bleaching by manganese

Biscéré

Ferrier‐Pagés

Gilbert

et al. 2018

Sci Rep

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Unprecedented mass coral bleaching events due to global warming and overall seawater pollution have been observed worldwide over the last decades. Although metals are often considered as toxic substances for corals, some are essential at nanomolar concentrations for physiological processes such as photosynthesis and antioxidant defenses. This study was designed to elucidate, the individual and combined effects of nanomolar seawater enrichment in manganese (Mn) and iron (Fe), on the main physiological traits of Stylophora pistillata, maintained under normal growth and thermal stress conditions. We provide, for the first time, evidence that Mn is a key trace element for coral symbionts, enhancing cellular chlorophyll concentrations, photosynthetic efficiency and gross photosynthetic rates at ambient temperature. Our experiment also highlights the key role of Mn in increasing coral resistance to heat stress-induced bleaching. While Mn-enriched corals did not bleach and did not reduce their rates of photosynthesis and calcification, control corals experienced significant bleaching. On the contrary to Mn, Fe enrichment not only impaired calcification but induced significant bleaching. Such information is an important step towards a better understanding of the response of corals to seawater enrichment in metals. It can also explain, to some extent, species susceptibility to environmental stress.

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“…These applications were used to demonstrate asymmetric patterns of photosynthetic yield across coral colonies [128], where the upper side has a reduced quantum yield [129]. Other experimental studies have been conducted using flow chambers to study coral physiology under chemical enrichment in a benthic chamber experiment [130] adding new findings on coral responses to high pCO2 and the combined effect of chemical inputs and global warming. A new diver-portable tool has been developed that enables short-term (minutes) experimentation with flow and chemical manipulations, as well as in situ measurements of coral metabolic health and rates of calcification [131].…”

Section: Large Incubation Systems Have Enabled Measurements Of Benthimentioning

confidence: 99%

Experimental Techniques to Assess Coral Physiology In Situ: Current Approaches and Novel Insights

Dellisanti

Chung

Chow

et al. 2020

Preprint

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Coral reefs are declining worldwide due to global changes in the marine environment. The increasing frequency and severity of massive bleaching events in the tropics are highlighting the need to better understand the stages of coral physiological responses to extreme conditions. Moreover, like many other coastal regions, coral reef ecosystems are facing additional localized anthropogenic issues such as nutrient loading, increased turbidity, and coastal development. The changes in coral metabolism under local or global stress conditions is studied largely through laboratory manipulation and field observations. Different strategies have been developed to measure the health status of a damaged reef, ranging from the resolution of individual polyps to an entire coral community, but techniques for measuring coral physiology in situ are not yet widely implemented. For instance, while there are many studies of the coral holobiont response in single or limited-number multiple stressor experiments, they provide only partial insights to metabolic performance under more complex temporally and spatially variable natural conditions. Here, we discuss the current status of coral reefs and their global and local stressors in the context of current experimental techniques that measure core processes in coral metabolism (respiration, photosynthesis, and biocalcification) and their role in indicating the health status of colonies and communities. The state of the art of in situ techniques for experimental and monitoring purposes is explored. We highlight the need to improve the capability of in situ studies in order to better understand the resilience and stress response of corals under multiple global and local scale stressors.

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Nickel and ocean warming affect scleractinian coral growth

Cited by 33 publications

References 57 publications

Characterization and sources of colored dissolved organic matter in a coral reef ecosystem subject to ultramafic erosion pressure (New Caledonia, Southwest Pacific)

Characterization and sources of colored dissolved organic matter in a coral reef ecosystem subject to ultramafic erosion pressure (New Caledonia, Southwest Pacific)

Evidence for mitigation of coral bleaching by manganese

Experimental Techniques to Assess Coral Physiology In Situ: Current Approaches and Novel Insights

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