The distribution of polyenes in the shell of Arctica islandica from North Atlantic localities: a confocal Raman microscopy study

Stemmer, Kristina; Nehrke, Gernot

doi:10.1093/mollus/eyu033

Cited by 34 publications

(36 citation statements)

References 29 publications

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“…On the other hand, it has been argued that polyenes do not generate from food sources like other pigments (i.e., carotenoids), but they are locally synthesized (Karampelas et al, 2009). In accordance to Stemmer and Nehrke (2014), the results presented here support the view that the specific diets on which the animals rely on do not influence shell pigment composition. The chemical characteristics of the polyenes are likely to be species-specific and independent from the habitats.…”

Section: Environmental Influence On Shell Microstructuresupporting

confidence: 84%

“…The pigments are abundant in the oOSL, whereas they become scarce in the iOSL. Furthermore, an enrichment in polyenes has been observed in the growth lines, potentially indicating their involvement in the biomineralization process (Stemmer and Nehrke, 2014). However, the specific functions of these organic compounds have not been disclosed yet (Hedegaard et al, 2006;Karampelas et al, 2009).…”

Section: A Islandica Shell Organizationmentioning

confidence: 99%

“…Electron backscatter diffraction (EBSD) has been previously used to determine the crystallographic orientation of gastropod (Fryda et al, 2009;Pérez-Huerta et al, 2011) and bivalve microstructural units (Checa et al, 2006;Frenzel et al, 2012;Karney et al, 2012). Whereas, CRM on mollusk shells is generally applied within studies on taphonomic mineralogical alteration and pigment identification (Stemmer and Nehrke, 2014;Beierlein et al, 2015). Both techniques provide considerably high spatially resolved analysis up to 250 nm, allowing for the identification of individual structural units at micrometer and nanometer scale (Cusack et al, 2008;Karney et al, 2012).…”

Section: Confocal Raman Microscopy As Tool For Microstructural Analysismentioning

confidence: 99%

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The effects of environment on <i>Arctica islandica</i> shell formation and architecture

et al. 2017

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Abstract. Mollusks record valuable information in their hard parts that reflect ambient environmental conditions. For this reason, shells can serve as excellent archives to reconstruct past climate and environmental variability. However, animal physiology and biomineralization, which are often poorly understood, can make the decoding of environmental signals a challenging task. Many of the routinely used shell-based proxies are sensitive to multiple different environmental and physiological variables. Therefore, the identification and interpretation of individual environmental signals (e.g., water temperature) often is particularly difficult. Additional proxies not influenced by multiple environmental variables or animal physiology would be a great asset in the field of paleoclimatology. The aim of this study is to investigate the potential use of structural properties of Arctica islandica shells as an environmental proxy. A total of 11 specimens were analyzed to study if changes of the microstructural organization of this marine bivalve are related to environmental conditions. In order to limit the interference of multiple parameters, the samples were cultured under controlled conditions. Three specimens presented here were grown at two different water temperatures (10 and 15 • C) for multiple weeks and exposed only to ambient food conditions. An additional eight specimens were reared under three different dietary regimes. Shell material was analyzed with two techniques; (1) confocal Raman microscopy (CRM) was used to quantify changes of the orientation of microstructural units and pigment distribution, and (2) scanning electron microscopy (SEM) was used to detect changes in microstructural organization. Our results indicate that A. islandica microstructure is not sensitive to changes in the food source and, likely, shell pigment are not altered by diet. However, seawater temperature had a statistically significant effect on the orientation of the biomineral. Although additional work is required, the results presented here suggest that the crystallographic orientation of biomineral units of A. islandica may serve as an alternative and independent proxy for seawater temperature.

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Section: Environmental Influence On Shell Microstructuresupporting

confidence: 84%

Section: A Islandica Shell Organizationmentioning

confidence: 99%

Section: Confocal Raman Microscopy As Tool For Microstructural Analysismentioning

confidence: 99%

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The effects of environment on <i>Arctica islandica</i> shell formation and architecture

et al. 2017

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“…These results are in accordance with the SEM observations of the inner structure of the tablets [31], showing that the central region of the tablets of gastropods and cephalopods are mainly organic. In situ maps (infrared and Raman spectrometries) also provide information on the nature of the mineral and organic components, as well as their respective location [32,33]. As for infrared and Raman spectrometry, and TOF-SIMS, both spectra and maps are available in XANES studies.…”

Section: Influence Of the Analytical Methodsmentioning

confidence: 99%

The Prismatic Layer of Pinna: A Showcase of Methodological Problems and Preconceived Hypotheses

et al. 2018

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Abstract:The prismatic layer of Pinna (Mollusca) is one of the most studied models for the understanding of the biomineralization mechanisms, but our knowledge of the organic components of this layer is limited to the proteins of the soluble organic matrices. The interplay of the mineral and organic matrices is studied using scanning electron and atomic force microscopy, infra-red spectrometry, thermogravimetric analyses, aminoacids analyses, thin layer chromatography (TLC), X-ray fluorescence, X-ray Absorption near Edge Structure (XANES) and time-of-flight secondary ion mass spectrometry (TOF-SIMS). Proteins, polysaccharides and lipids are detected within the prisms and their envelopes. The role of the technical choices to study calcareous biominerals is evidenced, showing that a single analysis is not enough to decipher complex biominerals.

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“…These matrices are commonly assumed to control the mineralogy, crystal habits and, consequently, the type of microstructure formed (Carter, 1980;Marin & Luquet, 2004). A study of pigment polyenes distribution in A. islandica shells reports a relative enrichment of the oOSL compared to iOSL (Stemmer & Nehrke, 2014) confirming this assumption. These observations suggest a possible difference in organics between the oOSL and iOSL in A. islandica shells.…”

Section: Role Of Chemical Properties Of Carbonates In D 18 O Control mentioning

confidence: 86%

Oxygen Isotope Composition of Arctica islandica Aragonite in the Context of Shell Architectural Organization: Implications for Paleoclimate Reconstructions

Trofimova

Milano

Andersson

et al. 2018

Geochem Geophys Geosyst

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The analysis of the stable isotopic composition of bivalve shells provides the data needed to construct climate records at high temporal resolution. Yet, the reproducibility of the results and the effect of microstructural organization on the isotopic signature and measurements have not been extensively studied. Here, we examine the architectural changes within Arctica islandica shells, specifically if samples from microstructurally different shell layers differ in respect to stable oxygen isotope values. The oxygen isotope profiles of two microstructurally different shell layers, each sampled at different temporal resolution, were compared to each other. Our results show that aragonite, collected from the layer that is dominated by cross‐acicular/lamellar structures, tends to be enriched in heavier oxygen isotopes compared to samples from portions of the outer shell layer dominated by homogeneous microstructure. In some cases, this difference exceeded 0.3 ‰, which can significantly affect the interpretation of a recorded environmental signal. Observed differences in stable oxygen isotope data may be associated with the physiology of the mollusk and the physical and chemical composition of studied shell layers.

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The distribution of polyenes in the shell of Arctica islandica from North Atlantic localities: a confocal Raman microscopy study

Cited by 34 publications

References 29 publications

The effects of environment on <i>Arctica islandica</i> shell formation and architecture

The effects of environment on <i>Arctica islandica</i> shell formation and architecture

The Prismatic Layer of Pinna: A Showcase of Methodological Problems and Preconceived Hypotheses

Oxygen Isotope Composition of Arctica islandica Aragonite in the Context of Shell Architectural Organization: Implications for Paleoclimate Reconstructions

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The distribution of polyenes in the shell of Arctica islandica from North Atlantic localities: a confocal Raman microscopy study

Cited by 34 publications

References 29 publications

The effects of environment on &lt;i&gt;Arctica islandica&lt;/i&gt; shell formation and architecture

The effects of environment on &lt;i&gt;Arctica islandica&lt;/i&gt; shell formation and architecture

The Prismatic Layer of Pinna: A Showcase of Methodological Problems and Preconceived Hypotheses

Oxygen Isotope Composition of Arctica islandica Aragonite in the Context of Shell Architectural Organization: Implications for Paleoclimate Reconstructions

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Product

Resources

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The effects of environment on <i>Arctica islandica</i> shell formation and architecture

The effects of environment on <i>Arctica islandica</i> shell formation and architecture