Influences of organic matter and calcification rate on trace elements in aragonitic estuarine bivalve shells

Takesue, Renee K.; Bacon, Charles R.; Thompson, Janet K.

doi:10.1016/j.gca.2008.09.003

Cited by 90 publications

(77 citation statements)

References 80 publications

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“…B/Ca in the beak region is systematically higher than those in the inner and outer prismatic layers (46 % higher than the inner prismatic and 69 % higher than the outer prismatic). As with B/Ca excursions present in winter bands, this offset can in part be attributed to accumulation of organic matter in this part of the shell, suggested by the dark brown colour of the shell material (Takesue et al, 2008). A recent study by Takesue et al (2008) showed a 33 % average decrease in Mg/Ca, 78 % average decrease in Mn/Ca, and 0-36 % decrease in Ba/Ca in Corbula amurensis, the Asian clam, after removal of organic matter using an oxidative cleaning procedure.…”

Section: Calcificationmentioning

confidence: 92%

“…As with B/Ca excursions present in winter bands, this offset can in part be attributed to accumulation of organic matter in this part of the shell, suggested by the dark brown colour of the shell material (Takesue et al, 2008). A recent study by Takesue et al (2008) showed a 33 % average decrease in Mg/Ca, 78 % average decrease in Mn/Ca, and 0-36 % decrease in Ba/Ca in Corbula amurensis, the Asian clam, after removal of organic matter using an oxidative cleaning procedure. This mechanism is consistent with higher mean measured B/Ca in the organic-rich beak region than in the other shell layers.…”

Section: Calcificationmentioning

confidence: 92%

“…The calcitic inner prismatic layer is present only in M. californianus, and not in any of its closely related species (Dodd, 1964). The beak region is the extension of the inner prismatic layer into the apex of the shell hinge, and is often discoloured due to higher concentrations of organic matter within the CaCO 3 matrix (Takesue et al, 2008). The inner prismatic layer accretes inward whereas the outer prismatic layer accretes outward (Fig.…”

Section: Sample Chronologymentioning

confidence: 99%

“…Because of the patterns of shell accretion in M. californianus, the winter bands tend to have a net accumulation of organic matter relative to the thick bands deposited during summer growth; a particularly long or severe winter prolongs the period of slow growth and potential shell dissolution due to low metabolic rates, and thereby contributes to an increase in excess organic matter left behind from carbonate dissolution in the winter band (Lutz and Rhoads, 1977;Takesue et al, 2008) This evidence for prolonged winter climate conditions is consistent with the best sample chronologies found in our study, which are associated with sinusoidal, temperature-dependent growth. A delay in the onset of faster shell accretion means that the mussel experiences a longer period of slow or nonexistent net growth at low temperatures.…”

Section: Winter Bandsmentioning

confidence: 99%

“…Despite this uncertainty, it is clear that most calcifying organisms precipitate carbonate material from an extracellular calcifying fluid from within the organism (see Allison et al, 2010;Meibom et al, 2008, for details in corals; Griffith et al, 2008, for forams;Klein et al, 1996;Takesue et al, 2008;Weiner and Dove, 2003, for bivalves), and that many organisms alter the chemical composition and pH of this extracellular fluid (Rollion-Bard et al, 2011a, b;Klein et al, 1996;Weiner and Dove, 2003).…”

Section: Calcificationmentioning

confidence: 99%

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Exploring B/Ca as a pH proxy in bivalves: relationships between <I>Mytilus californianus</I> B/Ca and environmental data from the northeast Pacific

et al. 2011

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Abstract.A distinct gap in our ability to understand changes in coastal biology that may be associated with recent ocean acidification is the paucity of directly measured ocean environmental parameters at coastal sites in recent decades. Thus, many researchers have turned to sclerochronological reconstructions of water chemistry to document the historical seawater environment. In this study, we explore the relationships between B/Ca and pH to test the feasibility of B/Ca measured on the ion probe as a pH proxy in the California mussel, Mytilus californianus. Heterogeneity in a range of ion microprobe standards is assessed, leading to reproducible B/Ca ratios at the 5 % level. The B/Ca data exhibit large excursions during winter months, which are particularly pronounced during the severe winters of 2004-2005 and 2005-2006. Furthermore, B/Ca ratios are offset in different parts of the skeleton that calcified at the same time. We compare the M. californianus B/Ca record to directly measured environmental data during mussel growth from the period of 1999-2009 to examine whether seawater chemistry or temperature plays a role in controlling shell B/Ca. A suite of growth rate models based on measured temperature are compared to the B/Ca data to optimise the potential fit of B/Ca to pH. Despite sampling conditions that were well-suited to testing a pH control on B/Ca, including a close proximity to an environmental record, a distinct change in pH at the sampling locale, and a growth model designed to optimise the correlations between seawater pH and shell B/Ca, we do not see a strong correlations between pH and shell B/Ca (maximum coefficient of determination, r 2 , of 0.207). Instead, our data indicate a strong biological control on B/Ca as observed in some other carbonate-forming organisms.

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Section: Calcificationmentioning

confidence: 92%

Section: Calcificationmentioning

confidence: 92%

Section: Sample Chronologymentioning

confidence: 99%

Section: Winter Bandsmentioning

confidence: 99%

Section: Calcificationmentioning

confidence: 99%

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Exploring B/Ca as a pH proxy in bivalves: relationships between <I>Mytilus californianus</I> B/Ca and environmental data from the northeast Pacific

et al. 2011

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Mechanisms to Explain the Elemental Composition of the Initial Aragonite Shell of Larval Oysters

Haley

Hales

Brunner

et al. 2018

Geochem Geophys Geosyst

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Calcifying organisms face increasing stress from the changing carbonate chemistry of an acidifying ocean, particularly bivalve larvae that live in upwelling regions of the world, such as the coastal and estuarine waters of Oregon (USA). Arguably the first and most significant developmental hurdle faced by larval oysters is formation of their initial prodissoconch I (PDI) shell, upon which further ontological development depends. We measured the minor metal compositions (Sr/Ca, Mg/Ca) of this aragonitic PDI shell and of post‐PDI larval Crassostrea gigas shell, as well as the water they were reared in, over ∼20 days for a May and an August cohort in 2011, during which time there was no period of carbonate under‐saturation. After testing various methods, we successfully isolated the shell from organic tissue using a 5% active chlorine bleach solution. Elemental compositions (Sr, Mg, C, N) of the shells post‐treatment showed that shell Sr/Ca ranged from 1.55 to 1.82 mmol/mol; Mg/Ca from 0.60 to 1.11 mmol/mol, similar to the few comparable published data for larval oyster aragonite compositions. We compare these data in light of possible biomineralization mechanisms: an amorphous calcium carbonate (ACC) path, an intercellular path, and a direct‐from‐seawater path to shell formation via biologically induced inorganic precipitation of aragonite. The last option provides a mechanistic explanation for: (1) the accelerated precipitation rates of biogenic calcification in the absence of a calcifying fluid; (2) consistently elevated precipitation rates at varying ambient‐water saturation states; and (3) the high Ca‐selectivity of the early larval calcification despite rapid precipitation rates.

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Diagenetic incorporation of Sr into aragonitic bivalve shells: implications for chronostratigraphic and palaeoenvironmental interpretations

Marcano

Frank

Mukasa

et al. 2015

The Depositional Record

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Aragonite is easily altered during diagenesis, therefore presumed pristine when present. In effect, beyond polymorphic transformation to calcite, alteration paths of aragonite remain poorly understood despite heavy reliance on such material to produce palaeoenvironmental and chronostratigraphic interpretations. Previous work on core material from Southern McMurdo Sound, Antarctica, showed that unlike their calcitic counterparts, seemingly unaltered aragonite shell fragments invariably produced older than expected 87 Sr/ 86 Sr ages. In this study, we pursued additional analyses of these aragonite shells and of the porewater of the core to understand this discrepancy. Aragonite mineralogy was reconfirmed and elemental mapping of shell fragments revealed growth lines within the middle layer suggestive of good preservation. The outer layer, however, showed anomalously high Sr concentrations (average 4Á5 AE 0Á6 mole% SrCO 3 ; ca 25 mmol mol À1 Sr/Ca) and was depleted in 18 O and 13 C compared to the middle layer, both features inconsistent with pristine material. The d18 O values and Sr concentrations of the porewater were used to model outer layer compositions reasonably well. Coincidentally, porewater Sr isotope composition was in general agreement with the age model of the core only at the aragonite-bearing interval suggesting that Sr-isotopic disequilibrium between porewater and the carbonates was the rule rather than the exception in the core. The Sr isotope compositions of the aragonite shells are most likely the result of early diagenesis as suggested by the inconsistent O and C isotope compositions between shell layers and the anomalously high Sr concentrations. We conclude that knowledge of Sr concentration and distribution in shells is critical to determine the viability of Sr stratigraphy and the scale at which it may be applied. Reliance on traditional indicators of lack of alteration, such as cathodoluminescence, Mn-Fe concentration, and the presence of labile mineralogies to assert chronostratigraphic and palaeoenvironmental questions may produce erroneous conclusions due to obscurely altered material.

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Influences of organic matter and calcification rate on trace elements in aragonitic estuarine bivalve shells

Cited by 90 publications

References 80 publications

Exploring B/Ca as a pH proxy in bivalves: relationships between <I>Mytilus californianus</I> B/Ca and environmental data from the northeast Pacific

Exploring B/Ca as a pH proxy in bivalves: relationships between <I>Mytilus californianus</I> B/Ca and environmental data from the northeast Pacific

Mechanisms to Explain the Elemental Composition of the Initial Aragonite Shell of Larval Oysters

Diagenetic incorporation of Sr into aragonitic bivalve shells: implications for chronostratigraphic and palaeoenvironmental interpretations

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Influences of organic matter and calcification rate on trace elements in aragonitic estuarine bivalve shells

Cited by 90 publications

References 80 publications

Exploring B/Ca as a pH proxy in bivalves: relationships between &lt;I&gt;Mytilus californianus&lt;/I&gt; B/Ca and environmental data from the northeast Pacific

Exploring B/Ca as a pH proxy in bivalves: relationships between &lt;I&gt;Mytilus californianus&lt;/I&gt; B/Ca and environmental data from the northeast Pacific

Mechanisms to Explain the Elemental Composition of the Initial Aragonite Shell of Larval Oysters

Diagenetic incorporation of Sr into aragonitic bivalve shells: implications for chronostratigraphic and palaeoenvironmental interpretations

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Product

Resources

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Exploring B/Ca as a pH proxy in bivalves: relationships between <I>Mytilus californianus</I> B/Ca and environmental data from the northeast Pacific

Exploring B/Ca as a pH proxy in bivalves: relationships between <I>Mytilus californianus</I> B/Ca and environmental data from the northeast Pacific