High-resolution trace and minor element compositions in deep-water scleractinian corals (Desmophyllum dianthus) from the Mediterranean Sea and the Great Australian Bight

Montagna, Paolo; McCulloch, Malcolm T.; Taviani, Marco; Remia, Alessandro; Rouse, Greg W.

doi:10.1007/3-540-27673-4_56

Cited by 16 publications

(16 citation statements)

References 72 publications

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“…Using a seawater U / Ca ratio of 1.305 µmol mol −1 (Chen et al, 1986), the partition coefficient D U = (U / Ca) skeleton / (U / Ca seawater ) varies between 0.9 and 1.6 and is in line with previous studies of U / Ca in CWCs (Anagnostou et al, 2011;Montagna et al, 2005;Sinclair et al, 2006). However, the observed CWC carbonate U / Ca ratios exhibit a two-fold greater variability compared to tropical corals (Shen and Dunbar, 1995;Inoue et al, Error bars correspond to pH of ±0.15.…”

Section: The Effect Of Coral Physiology and Symbiotic Algae On Uraniusupporting

confidence: 86%

The influence of seawater pH on U / Ca ratios in the scleractinian cold-water coral <i>Lophelia pertusa</i>

Raddatz

Rüggeberg²,

Flögel

et al. 2014

Biogeosciences

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Abstract. The increasing pCO 2 in seawater is a serious threat for marine calcifiers and alters the biogeochemistry of the ocean. Therefore, the reconstruction of past-seawater properties and their impact on marine ecosystems is an important way to investigate the underlying mechanisms and to better constrain the effects of possible changes in the future ocean. Cold-water coral (CWC) ecosystems are biodiversity hotspots. Living close to aragonite undersaturation, these corals serve as living laboratories as well as archives to reconstruct the boundary conditions of their calcification under the carbonate system of the ocean.We investigated the reef-building CWC Lophelia pertusa as a recorder of intermediate ocean seawater pH. This species-specific field calibration is based on a unique sample set of live in situ collected L. pertusa and corresponding seawater samples. These data demonstrate that uranium speciation and skeletal incorporation for azooxanthellate scleractinian CWCs is pH dependent and can be reconstructed with an uncertainty of ±0.15. Our Lophelia U / Ca-pH calibration appears to be controlled by the high pH values and thus highlighting the need for future coral and seawater sampling to refine this relationship. However, this study recommends L. pertusa as a new archive for the reconstruction of intermediate water mass pH and hence may help to constrain tipping points for ecosystem dynamics and evolutionary characteristics in a changing ocean.

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Section: The Effect Of Coral Physiology and Symbiotic Algae On Uraniusupporting

confidence: 86%

The influence of seawater pH on U / Ca ratios in the scleractinian cold-water coral <i>Lophelia pertusa</i>

Raddatz

Rüggeberg²,

Flögel

et al. 2014

Biogeosciences

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“…Comparable microstructurally-related Mg/Ca variations were also documented in the deep-water corals Desmophyllum dianthus (Montagna et al, 2005;Gagnon et al, 2007), Flabellum spp., and Caryophyllia spp. (Shirai et al, 2005), and in tropical corals (Meibom et al, 2006;Allison and Finch, 2007) thereby implying some common physiological mechanisms controlling the uptake of Mg in coral skeletons.…”

Section: Fine-scale Variation Of Element Contents In Coral Skeleton Amentioning

confidence: 67%

“…Azooxanthellate deep-water (or cold-water) corals are also potential archives of intermediate and bathyal water mass history (Adkins et al, 1998;Frank et al, 2004;Montagna et al, 2005Montagna et al, , 2006Robinson et al, 2005;Sinclair et al, 2006;McCulloch et al, 2010) but unlike shallowwater zooxanthellate corals (i.e. in symbiosis with unicellular Symbiodinium algae), they also have the advantage of inhabiting greater depths and a wider geographic range.…”

Section: Introductionmentioning

confidence: 99%

“…Further studies have however revealed the complex nature of such fractionation processes and the resulting limitations to derive temperature values (Adkins et al, 2003;Lutringer et al, 2005;Rollion-Bard et al, 2010). Moreover, trace element compositions have been shown to be strongly influenced by biological fractionation (Montagna et al, 2005;Gagnon et al, 2007;Meibom et al, 2008). It is thus clear that both tropical and cold-water corals, regardless of the presence (or absence) of zooxanthellae, exert a strong biological control over the internal chemical micro-environment at the site of calcification (Adkins et al, 2003;McCulloch et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Li/Mg systematics in scleractinian corals: Calibration of the thermometer

Montagna

McCulloch

Douville

et al. 2014

Geochimica et Cosmochimica Acta

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120

151

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We show that the Li/Mg systematics of a large suite of aragonitic coral skeletons, representing a wide range of species inhabiting disparate environments, provides a robust proxy for ambient seawater temperature. The corals encompass both zooxanthellate and azooxanthellate species (Acropora sp., Porites sp., Cladocora caespitosa, Lophelia pertusa, Madrepora oculata and Flabellum impensum) collected from shallow, intermediate, and deep-water habitats, as well as specimens cultured in tanks under temperature-controlled conditions. The Li/Mg ratios observed in corals from these diverse tropical, temperate, and deep-water environments are shown to be highly correlated with temperature, giving an exponential temperature relationship of: Li/Mg (mmol/mol) = 5.41 exp (À0.049 * T) (r 2 = 0.975, n = 49). Based on the standard error of the Li/Mg versus temperature correlation, we obtain a typical precision of ±0.9°C for the wide range of species analysed, similar or better than that of other less robust coral temperature proxies such as Sr/Ca ratios.The robustness and species independent character of the Li/Mg temperature proxy is shown to be the result of the normalization of Li to Mg, effectively eliminating the precipitation efficiency component such that temperature remains as the ⇑ Corresponding author at: Istituto di Scienze Marine (ISMAR), Consiglio Nazionale delle Ricerche, Via Gobetti 101, 40129 Bologna, Italy. Tel.: +39 051 6398913.E-mail address: paolo.montagna@bo.ismar.cnr.it (P. Montagna). 1Published in which should be cited to refer to this work.http://doc.rero.ch main controller of coral Li/Mg compositions. This is inferred from analysis of corresponding Li/Ca and Mg/Ca ratios with both ratios showing strong microstructure-related co-variations between the fibrous aragonite and centres of calcification, a characteristic that we attribute to varying physiological controls on growth rate. Furthermore, Li/Ca ratios show an offset between more rapidly growing zooxanthellate and azooxanthellate corals, and hence only an approximately inverse relationship to seawater temperature. Mg/Ca ratios show very strong physiological controls on growth rate but no significant dependence with temperature, except possibly for Acropora sp. and Porites sp. A strong positive correlation is nevertheless found between Li/Ca and Mg/Ca ratios at similar temperatures, indicating that both Li and Mg are subject to control by similar growth mechanisms, specifically the mass fraction of aragonite precipitated during calcification, which is shown to be consistent with a Rayleigh-based elemental fractionation model. The highly coherent array defined by Li/Mg versus temperature is thus largely independent of coral calcification mechanisms, with the strong temperature dependence reflecting the greater sensitivity of the K dLi/Ca partition coefficient relative to K d Mg/Ca . Accordingly, Li/Mg ratios exhibit a highly coherent exponential correlation with temperature, thereby providing a more robust tool for reconstructing paleo-seawat...

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“…All corals studied contain other correlations between pairs of trace-elements, but none are as tight as the Mg/U correlation, and only the Mg/U correlation is present in all coral genera. A summary table of other trace-element correlations, taken from these observations and the work of Montagna et al [2005], Hart and Cohen [1996], and Meibom et al [2006] can be found in the auxiliary material.…”

Section: Resultsmentioning

confidence: 99%

A biological origin for climate signals in corals—Trace element “vital effects” are ubiquitous in Scleractinian coral skeletons

Sinclair¹,

Williams²,

Risk³

2006

Geophysical Research Letters

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Laser ablation ICP/MS was used to analyze Mg, Sr and U at fine (hundreds of microns) and seasonal spatial scales in the reef coral Porites and the non‐photosynthetic “deep‐sea” corals Lophelia, Oculina, and Desmophyllum. Tropical corals display strong seasonal correlations between Mg, Sr and U, even when normal cycles are perturbed by unknown factors. An inverse relationship between Mg and U is a universal feature of all the corals, but is much larger in deep corals despite stable environmental conditions. This correlation originates from two aragonitic skeletal types: Mg‐rich opaque centers of calcification, and U‐rich large translucent crystals. The Mg‐rich material probably precipitates rapidly and corresponds to materials strongly deficient in 18O and 13C compared to isotopic equilibrium. Combined, these observations imply that varying proportions of the two skeletal types may account for most of the “temperature” or “climate” signal in tropical corals, as well as anomalous “vital effects”.

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High-resolution trace and minor element compositions in deep-water scleractinian corals (Desmophyllum dianthus) from the Mediterranean Sea and the Great Australian Bight

Cited by 16 publications

References 72 publications

The influence of seawater pH on U / Ca ratios in the scleractinian cold-water coral <i>Lophelia pertusa</i>

The influence of seawater pH on U / Ca ratios in the scleractinian cold-water coral <i>Lophelia pertusa</i>

Li/Mg systematics in scleractinian corals: Calibration of the thermometer

A biological origin for climate signals in corals—Trace element “vital effects” are ubiquitous in Scleractinian coral skeletons

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High-resolution trace and minor element compositions in deep-water scleractinian corals (Desmophyllum dianthus) from the Mediterranean Sea and the Great Australian Bight

Cited by 16 publications

References 72 publications

The influence of seawater pH on U / Ca ratios in the scleractinian cold-water coral &lt;i&gt;Lophelia pertusa&lt;/i&gt;

The influence of seawater pH on U / Ca ratios in the scleractinian cold-water coral &lt;i&gt;Lophelia pertusa&lt;/i&gt;

Li/Mg systematics in scleractinian corals: Calibration of the thermometer

A biological origin for climate signals in corals—Trace element “vital effects” are ubiquitous in Scleractinian coral skeletons

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The influence of seawater pH on U / Ca ratios in the scleractinian cold-water coral <i>Lophelia pertusa</i>

The influence of seawater pH on U / Ca ratios in the scleractinian cold-water coral <i>Lophelia pertusa</i>