Oxygen isotope records of the Australian flat oyster (Ostrea angasi) as a potential temperature archive

Tynan, Sarah; Dutton, Andrea; Eggins, Stephen; Opdyke, Bradley N.

doi:10.1016/j.margeo.2014.07.009

Cited by 11 publications

(8 citation statements)

References 53 publications

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“…Also, the amplitude of both isotope ratios are not higher than those of other specimens, contrary to what is observed in the literature between open marine and estuarine localities (Figure 7a). The observed distributions of all Mermian isotopic data tend to indicate that most specimens did not live in direct proximity to a river output, as observed for the data presented in Figure 7a (Surge & Lohmann 2008;Tynan et al 2014;Walther & Rowley 2013) and from other data collected on oyster shells from various coastal areas of France (Lartaud, 2007). It is however possible that this can be due to missing data during low temperature and/or salinity periods.…”

Section: Discussionsupporting

confidence: 74%

“…The δ 13 C is however challenging to interpret. It has been demonstrated that the carbon isotopic composition from oyster shells fluctuates with the dissolved inorganic carbon in the water, the food source and metabolic processes (Gillikin et al 2006;Lartaud et al 2010a;McConnaughey & Gillikin 2008), and the comparison of data from a selection of publications on Figure 7a (Surge & Lohmann 2008;Tynan et al 2014;Walther & Rowley 2013) indeed illustrates the potential influence of several parameters. Inter-specific differences cannot be the major factor as Crassostrea virginica exhibits distinct δ 13 C in Florida (Surge & Lohmann 2008) and Texas (Walther & Rowley 2013).…”

Section: Discussionmentioning

confidence: 98%

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Geochemistry of Bivalve Shells As Indicator of Shore Position of the 2<sup>nd</sup> Century BC

et al. 2020

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In an area named Mermian (municipality of Agde, South of France), a significant amount of fragmented italic amphorae from the 2 nd century BC was discovered, located at a depth of 6 to 8 meters under the bed of the Hérault river. As no ship wreck was found in the vicinity, the reason of the presence of these amphora fragments, whose faces present a large accumulation of oyster shells, is unknown. Reconstructed geomorphological maps of the area present Mermian as a riverine site already at this period, and several hypothetical explanations on the role of these amphorae exist (landfill linked to a neighbouring habitat, bank reinforcement linked to a ford crossing, river landing, etc.). In order to define whether the amphorae were transported to this location and from where, we analysed the stable carbon and oxygen isotopes of the oyster shells. The δ 13 C and δ 18 O indicate that all oysters lived in the same environment, refuting a potential transport during the oyster accumulation. Moreover, the analysis of Mytilaster sp. shells in the sediment around the oyster shells also reported a marine origin, suggesting that these oysters were also buried in a marine deposit. Transport to Mermian from a coastal locality is unlikely but may still have happened, although no trace of human handling were observed on the fragments. Still, the presence of other marine or brackish molluscs in the sediment discards the interpretation of Mermian being a continental locality.

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Section: Discussionsupporting

confidence: 74%

Section: Discussionmentioning

confidence: 98%

Geochemistry of Bivalve Shells As Indicator of Shore Position of the 2<sup>nd</sup> Century BC

et al. 2020

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“…After the first year of life, labeled here as the juvenile phase, our results show that oysters mineralize their shells close to the isotopic equilibrium and thus can accurately reflect the seawater temperatures, assuming an independent estimation of the isotopic composition of seawater. This confirms the use of this type of biogenic material as a promising paleoclimate archive, as revealed by the large bibliography on modern and fossil oysters (Kirby et al, 1998;Surge et al, 2001Surge et al, , 2003Harding et al, 2010;Lartaud et al, 2010a;Harzhauser et al, 2011;Bougeois et al, 2014;Tynan et al, 2014;Huyghe et al, 2015;Briard et al, 2020).…”

Section: Paleoclimatic Implicationssupporting

confidence: 77%

“…In depth work is thus required to characterize the conditions under which mollusks form their shells at isotopic equilibrium. Among the mollusk shells used as environmental archives, shallow-water oysters are considered as important model species, as many studies have shown that their oxygen stable isotope signature can provide reliable information about their living conditions using oxygen stable isotopes geochemistry (Wefer and Berger, 1991;Richardson et al, 1993;Kirby et al, 1998;Surge et al 2001Surge et al , 2003Lécuyer et al, 2004;Lartaud et al, 2010aLartaud et al, , 2010bUllmann et al 2010;Tynan et al 2014), or magnesium-calcium ratios (Surge and Lohmann, 2008;Mouchi et al, 2013;Tynan et al, 2017). Oysters are ubiquitous and abundant organisms found in shallow marine and brackish deposits since the Jurassic and mineralize their shells with calcite materials, making them resistant to diagenesis.…”

Section: Introductionmentioning

confidence: 99%

Oxygen isotope disequilibrium in the juvenile portion of oyster shells biases seawater temperature reconstructions

Huyghe

Emmanuel

Rafélis

et al. 2020

Estuarine, Coastal and Shelf Science

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For decades, bivalve shells have constituted one of the most common supports for paleoclimatic archives based on stable isotope approaches. In this work, we conducted chemical marking and recapture techniques to study the fluctuation of δ18O values of oyster shells of the species Magallana gigas reared in natural environment in Normandy (France) for two years. The results were compared to the continuous monitoring of temperature and salinity and monthly records of seawater δ18O. Isotopic measurements were performed on the hinge area that regroups the whole life of the oysters. Here we demonstrate that oysters mineralized their shells with no significant growth breaks during the two-years experiment, even at temperatures below 6 °C. The results confirm that adult oysters (i.e. > 1 yr) mineralized their shells at equilibrium. However, juvenile specimens exhibit a strong isotopic disequilibrium, with a maximum shift of the δ18O values of 3‰ in winter, likely due to kinetic isotope effects. This corresponds to a reconstructed temperature up to 13 °C warmer than expected. This work indicates that although these oyster shells can be used as an accurate archive of (paleo)environmental conditions, the shell portion mineralized during the juvenile stage (i.e. < 1 yr) should be avoided for paleotemperature reconstructions. Given the wide use of bivalve shells as environmental archives, similar studies on others species are required. Highlights► We analyze the δ 18 O composition of oyster shells of Normandy (France). ► An isotopic disequilibrium is identified during the juvenile portion of the shell. ► Isotopic disequilibrium is related to kinetic effect due to fast growth rate. ► Adult oysters mineralize their shells in equilibrium. ► Juvenile portion of the shell should be avoided for paleoclimatic reconstructions.Please note that this is an author-produced PDF of an article accepted for publication following peer review. The definitive publisher-authenticated version is available on the publisher Web site.

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“…The variation among published temperature‐dependent fractionation factors in bivalve studies highlights the importance of modern calibration studies. From such studies, authors have been able to validate the use of existing paleotemperature equations (e.g., Huyghe et al., 2020; Lécuyer et al., 2004), or have been able to produce species‐specific equations (e.g., Carré et al., 2005; Royer et al., 2013; Tynan et al., 2014). In addition to the potential biological effects, recent research has investigated kinetic effects on the equilibrium oxygen isotope fractionation between organic and inorganic carbonates and water (Daëron et al., 2019; Watkins et al., 2013).…”

Section: Introductionmentioning

confidence: 99%

Controls Over Oxygen Isotope Fractionation in the Waters and Bivalves (Arthritica helmsi) of an Estuarine Lagoon System

Chamberlayne

Tyler

Gillanders

2021

Geochem Geophys Geosyst

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Oxygen isotope ratios in bivalve shells have long been used as a proxy for environmental change, reflecting both temperature and the oxygen isotope composition of host water. In estuarine systems, the oxygen isotope composition of water is complicated by variable mixing between river and seawater, as well as evaporative enrichment. In addition, due to species‐specific variation in temperature‐dependent fractionation into bivalve carbonate, modern calibrations are necessary prior to applications in paleoenvironmental studies. In this study, live specimens of the micromollusc Arthritica helmsi were collected from five sites in the Coorong Lagoon, an estuarine system at the mouth of the River Murray, Australia, on six occasions from November 2016 to May 2018. Whole shell oxygen and carbon isotope compositions (n = 131) were measured alongside monthly temperature and oxygen and hydrogen isotope analyses of waters from the Coorong and neighboring Lake Alexandrina (n = 137). Oxygen and hydrogen isotope ratios in water were mostly controlled by evaporation of source waters, though a period of high river water discharge was reflected in the isotopic values of the Coorong North Lagoon. A species‐specific temperature‐dependent oxygen isotope fractionation equation was calibrated for A. helmsi: T (°C) = (21.39 ± 0.45) − (4.43 ± 0.38) × (δ18Oshell − δ18Owater). This equation is similar to other published paleotemperature equations for biogenic carbonates. These contemporary observations of the isotope hydrology of the Coorong, coupled with our contemporary calibration of oxygen isotope fractionation, lay the foundation for paleoenvironmental studies using bivalves collected from the sediments of the Coorong.

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Oxygen isotope records of the Australian flat oyster (Ostrea angasi) as a potential temperature archive

Cited by 11 publications

References 53 publications

Geochemistry of Bivalve Shells As Indicator of Shore Position of the 2<sup>nd</sup> Century BC

Geochemistry of Bivalve Shells As Indicator of Shore Position of the 2<sup>nd</sup> Century BC

Oxygen isotope disequilibrium in the juvenile portion of oyster shells biases seawater temperature reconstructions

Controls Over Oxygen Isotope Fractionation in the Waters and Bivalves (Arthritica helmsi) of an Estuarine Lagoon System

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