Profiles of trace elements and stable isotopes derived from giant long-lived Tridacna gigas bivalves: Potential applications in paleoclimate studies

Elliot, Mary; Welsh, Kevin; Chilcott, Colin P.; McCulloch, Malcolm T.; Chappell, John; Ayling, Bridget

doi:10.1016/j.palaeo.2009.06.007

Cited by 144 publications

(146 citation statements)

References 59 publications

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“…S3). We note that a previous study, which measured Sr/Ca in a different bivalve species Tridacna gigas, showed no clearly reproducible seasonal trend 18 . The discrepancy with this work may be attributable to the coarser analytical spatial resolution (70-µm spot diameter by laser ablation ICP-MS), or to the particular age of the clam individual used in the previous study.…”

Section: Sample Description and Sr/ca Imaging Live Giant Clams (Tridcontrasting

confidence: 66%

Past daily light cycle recorded in the strontium/calcium ratios of giant clam shells

et al. 2012

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The historical record of daily light cycle in tropical and subtropical regions is short. moreover, it remains difficult to extract this cycle in the past from natural archives such as biogenic marine carbonates. Here we describe the precise analysis of sr/Ca, mg/Ca, and Ba/Ca ratios in a cultivated giant clam shell, using a laterally high-resolution secondary ion mass spectrometer with 2 µm resolution. The sr/Ca ratio exhibits striking diurnal variations, reflecting the daily light cycle. A clear seasonal variation in sr/Ca is also observed in another longer set of measurements with 50 µm resolution. Light-enhanced calcification and elemental transportation processes, in giant clam and symbiotic algae, may explain these diurnal and annual variations. This opens the possibility to develop the sr/Ca ratio from a giant clam shell as an effective proxy for parameters of the daily light cycle.

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Section: Sample Description and Sr/ca Imaging Live Giant Clams (Tridcontrasting

confidence: 66%

Past daily light cycle recorded in the strontium/calcium ratios of giant clam shells

et al. 2012

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“…The Mg / Ca profiles of both marine and freshwater aragonitic species show large interspecimen differences with a minor contribution from the variation of ambient environmental factors (e.g., Takesue et al, 2008;Schöne et al, 2010;Izumida et al, 2011), suggesting that the Mg / Ca ratios of shell aragonite may reflect biological factors rather than regulated substitution into the aragonite crystal lattice. In a giant clam Tridacna gigas, Elliot et al (2009) observed seasonal Mg / Ca oscillations superimposed on an ontogenetic trend with increasing values and increasing amplitude with age. However, to our knowledge no detailed comparisons regarding the covariation of organic materials with Mg concentrations in the bivalve shell are available.…”

Section: T Yoshimura Et Al: Fluctuations Of Sulfate S-bearing Aminmentioning

confidence: 87%

“…However, the overall shape of the Mg-XANES spectrum for H. hippopus was featureless (Fig. 2), which arises either from the organic materials or the highly disordered phase (Finch and Allison, 2008;Foster et al, 2008). XANES results did not permit us to discriminate between organic and disordered Mg phase in aragonitic shells.…”

Section: Magnesium Chemical Environment and Profilementioning

confidence: 94%

“…Sulfur and magnesium K-edge X-ray absorption near edge structure (XANES) has also been applied to the characterization of the chemical environment (e.g., Pingitore et al, 1995;Morra et al, 1997;Finch and Allison, 2008;Foster et al, 2008;Cusack et al, 2008;Yoshimura et al, 2013a). XAS can be used in combination with X-ray fluorescence with a focused X-ray beam (i.e., micro-X-ray fluorescence; µ-XRF) to determine the speciation-specific spatial element distribution in biogenic carbonates and to generate time series of trace-element profiles in biogenic CaCO 3 with high lateral resolution.…”

Section: T Yoshimura Et Al: Fluctuations Of Sulfate S-bearing Aminmentioning

confidence: 99%

“…Long-lived bivalves such as reef-dwelling giant clams are geologically important producers of biominerals that provide long-term records (up to ∼ 100 years) of environmental conditions in tropical and subtropical oceans (e.g., Watanabe et al, 2004;Aubert et al, 2009). Previous studies have analyzed the element profiles of divalent cations and Sr / Ca ratios, the primary objective being to evaluate them as environmental proxies (e.g., Elliot et al, 2009;Sano et al, 2012;Yan et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Fluctuations of sulfate, S-bearing amino acids and magnesium in a giant clam shell

et al. 2014

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Abstract. We used micro-X-ray fluorescence combined with X-ray photoabsorption spectroscopy to investigate speciation-specific sulfur profiles in the inner shell layer of a giant clam (Hippopus hippopus). The sulfate, S-bearing amino acids, and total sulfur profiles indicated that inorganic sulfate was the dominant component in the shell of this bivalve. Sulfur profiles in the inner shell layer showed clear annual fluctuations that varied by more than one order of magnitude, from < 50 to 1420 ppm, and sulfate and total sulfur maxima became higher with age, whereas no ontogenetic trend was noticeable in the profile of S-bearing amino acids. A change in the carbonate ion concentration in the calcifying fluid would suggest that an ontogenetic increase in the relative activity of sulfate ions to carbonate ions in the calcifying fluid affects sulfate concentrations in the shells. These results suggest that trace sulfur profiles in the shell of the giant clam may reflect both cyclic shell growth related to environmental factors such as insolation and temperature and ontogenetic changes of the calcifying fluid chemistry mediated by physiological processes. The observed S profile implies a clear change in calcifying fluid chemistry towards less alkaline condition with age. Magnesium fluctuations suggested that Mg was incorporated into the shells at high growth rates during warm seasons. The spectrum of Mg K-edge X-ray absorption near edge structure (XANES) and comparison of Mg and S-bearing amino acids profiles indicated that a pronounced effect of the organic fraction or disordered phases were observed in aragonitic shell of H. hippopus rather than regulated substitution into the aragonite crystal lattice.

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ENSO reconstructions over the past 60 ka using giant clams (Tridacna sp.) from Papua New Guinea

Driscoll

Elliot

Russon

et al. 2014

Geophysical Research Letters

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We present 12 seasonally resolved δ 18 O profiles of giant clams (Tridacna sp.) from the Huon Peninsula, Papua New Guinea, spanning discrete periods of time (9-38 years) over the past 60 ka. The interannual anomaly time series of these shells are used to reconstruct interannual variability which can predominantly be attributed in the modern climate to the El Niño-Southern Oscillation (ENSO) in this region. We have found a significant reduction in interannual δ 18 O variance during the early Holocene, whereas during Marine Isotope Stage 3 there were at least some periods with variance not significantly different to the twentieth century. We show that ENSO variability seen during the late twentieth century is rare but not unprecedented within glacial climates.

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Profiles of trace elements and stable isotopes derived from giant long-lived Tridacna gigas bivalves: Potential applications in paleoclimate studies

Cited by 144 publications

References 59 publications

Past daily light cycle recorded in the strontium/calcium ratios of giant clam shells

Past daily light cycle recorded in the strontium/calcium ratios of giant clam shells

Fluctuations of sulfate, S-bearing amino acids and magnesium in a giant clam shell

ENSO reconstructions over the past 60 ka using giant clams (Tridacna sp.) from Papua New Guinea

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