Calibration of seawater temperature and δ 18Oseawater signals in Tridacna maxima’s δ 18Oshell record based on in situ data

Duprey, Nicolas; Lazareth, Claire E.; Dupouy, Cécile; Butscher, John; Farman, Richard; Maes, Christophe; Cabioch, Guy

doi:10.1007/s00338-014-1245-z

Cited by 24 publications

(19 citation statements)

References 48 publications

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“…The Duprey et al . () equation (2) produced SST estimates that were not significantly different from modern temperatures and were in fact most similar to the temperatures recorded in the region in 2015. The statistically non‐significant difference between the SST values generated from testing modern isotopic ratios and the modern recorded SST values for the region indicates that the chosen equation accurately converts SST given δ 18 O values (Figures and ).…”

Section: Discussionmentioning

confidence: 55%

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Evaluating the efficacy of the mollusc Tridacna crocea for reconstructing ancient sea‐surface temperatures in the Rock Islands of Palau, Micronesia

Jew

Dodrill²,

Fitzpatrick

2019

Archaeology in Oceania

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Previous stable isotope studies for shellfish collected in waters surrounding the Palauan archipelago (north-western tropical Pacific) have demonstrated that various local shellfish taxa may be reliable recorders of their ambient water temperatures from modern and archaeological contexts. In this study, we analysed stable oxygen isotope (δ 18 O) signatures of Tridacna crocea from the archaeological site of Metuker ra Bisech (B:IR-2:24) to reconstruct average nearshore sea-surface temperatures (SST) from two components dated to c.560 and 120 calBP. Modern shellfish samples and environmental data were collected from intertidal zones on nearby Orrak Island to provide a modern analogue. These shells were tested using X-ray diffraction to ensure no secondary recrystallisation of the aragonitic structure. Uncontaminated samples were measured for δ 18 O to pair with recorded SST. The most appropriate oxygen isotope-to-SST conversion formula was then applied to δ 18 O signatures from archaeological T. crocea to estimate SST averages. The results of this study indicate that T. crocea accurately records ambient SST and is a good proxy for palaeotemperature reconstruction. Our results were compared to previous isotopic studies on Palauan taxa collected to identify regional changes to SST through time, thus allowing for comparisons between human subsistence practices, resource availability and past palaeoenvironments. RÉSUMÉ Desétudes antérieures sur les isotopes stables de mollusques et de crustacés recueillis dans les eaux entourant l'archipel des Palaos (Pacifique tropical nord-ouest) ont montré que certains taxons de mollusques et crustacés locaux peuventêtre des enregistreurs fiables de la température de l'eau ambiante dans des contextes archéologiques et modernes. Dans cetteétude, nous avons analysé les signatures d'isotopes stables de l'oxygène (δ 18 O) de Tridacna crocea provenant du site archéologique de Metuker ra Bisech (B:IR-2:24) afin de reconstituer les températures moyennesà la surface de la mer (TSM) littoralà partir de deux couches, qui dateà 560 et 120 calibré BP. Deséchantillons de mollusques modernes et des données environnementales ontété recueillis dans les zones intertidales de l'île voisine d'Orrak afin de fournir un analogue moderne. Ces coquilles ontété analysées par diffraction des rayons X pour assurer contre recristallisation secondaire de la structure aragonitique. Leséchantillons non contaminés ontété mesurés pour δ 18 O afin de coupler la TSM enregistrée. La formule de conversion isotope oxygène-TSM la plus appropriée a ensuiteété appliquée aux signatures δ 18 O de T. crocea archéologique pour estimer les moyennes de la TSM. Les résultats de cetteétude indiquent que T. crocea enregistre avec précision la TSM ambiante et constitue un bon substitut pour la reconstruction de paléotempératures. Nos résultats ontété comparésà desétudes isotopiques précédentes sur des taxons des Palaos recueillies pour identifier les changements régionaux de la TSM au fil du temps, permettant ainsi des comparaisons...

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Section: Discussionmentioning

confidence: 55%

“…In their study, they concluded that sea‐surface temperature is the main driver of the δ 18 O present in Tridacna shell (Duprey et al . : 448).…”

Section: The Environmental and Archaeological Contextmentioning

confidence: 98%

Evaluating the efficacy of the mollusc Tridacna crocea for reconstructing ancient sea‐surface temperatures in the Rock Islands of Palau, Micronesia

Jew

Dodrill²,

Fitzpatrick

2019

Archaeology in Oceania

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“…Therefore, Tridacna δ 18 O shell provides high-resolution paleotemperature reconstruction on decadal to century time scales (Watanabe & Oba, 1999). In addition, previous studies have suggested that Tridacnidae shell is secreted in isotopic equilibrium with seawater (Aharon, 1991;Aharon & Chappell, 1986;Duprey et al, 2014;Jones et al, 1986;Romanek & Grossman, 1989;Watanabe & Oba, 1999). The earlier study of Romanek and Grossman (1989) revealed that the δ 18 O shell profile of the giant clam T. maxima recorded seasonal SST periods.…”

Section: Introductionmentioning

confidence: 98%

“…Counting daily growth increments provides us exact deposition dates for daily increments. This attribute also allows precise dating for geochemical analysis data from a Tridacna shell (Aubert et al, ; Duprey et al, ; Watanabe & Oba, ). Growth pattern analysis is useful for reconstruction of past environments with daily resolution (upwelling: Aubert et al, ; Cyclone: Schwartzmann et al, ).…”

Section: Introductionmentioning

confidence: 99%

“…Symbiont algae (zooxanthellae) in their hypertrophied mantle enable rapid growth, for example, approximately 15 mm/yr in a Tridacna gigas inner shell layer (Watanabe et al, 2004). Annual and daily growth increments were recognizable in the shells of T. gigas, Tridacna maxima, Tridacna squamosa, and Hippopus hippopus (Aharon & Chappell, 1986;Aubert et al, 2009;Bonham, 1965;Duprey et al, 2014;Pannella & MacClintock, 1968;Pätzold et al, 1991;Sano et al, 2012;Warter et al, 2015;Watanabe et al, 2004;Watanabe & Oba, 1999). Counting daily growth increments provides us exact deposition dates for daily increments.…”

Section: Introductionmentioning

confidence: 99%

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Geochemical and Microstructural Signals in Giant ClamTridacna maximaRecorded Typhoon Events at Okinotori Island, Japan

et al. 2018

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To validate the usability of the giant clam shell as a recorder of short‐term environmental changes such as typhoons, we collected a live Tridacna maxima from Okinotori Island, Japan, on 15 June 2006. Growth increment thickness, stable isotope ratio (δ18Oshell, δ13Cshell), and the barium/calcium ratio (Ba/Ca) in the T. maxima shell sample were measured and compared to Okinotori Island instrumental environmental data. In the outer layer of the shell sample, there were 365 ± 6 growth increments per year, as estimated by the δ18Oshell profile compared with sea surface temperature. The growth increments in the specimen were formed daily, and thus, we can determine the date of the sampling points of δ18Oshell, δ13Cshell and the Ba/Ca ratio by counting growth increments. After typhoon approach, there is a decrease in increment thickness and some disturbed growth increments. The positive peaks in the shell Ba/Ca ratio and δ18Oshell corresponded to lower sea surface temperature caused by typhoons. These results indicated that the microstructural and geochemical record in Tridacna maxima shells could be useful for detecting past typhoon events.

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Archaeology and Sclerochronology of Marine Bivalves

Butler

Burchell

Chauvaud

2018

Goods and Services of Marine Bivalves

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In a rapidly changing world, maintenance of the good health of the marine environment requires a detailed understanding of its mechanisms of change, and the ability to detect early signals of a shift away from the equilibrium state that we assume characterized it before there was any significant human impact. Given that instrumental measurements of the oceans go back no further than a few decades, the only way in which we can assess the long-term baseline variability that characterizes the pre-perturbation equilibrium state of the marine environment is by the use of proxy records contained in stratified or layered natural archives such as corals, fish otoliths and bivalve mollusc shells. In this chapter we will look at the ways in which the environmental signals recorded in the shells of bivalve molluscs can be used to shed light on marine variability both in the present and over past centuries and millennia, and specifically how they can be used to study marine climate, the marine environment and the economic and cultural history of the relationship between humans and the oceans. The chapter is divided into two parts: section one describes the morphological, geochemical and crystallographic techniques that are used to obtain information from the shells, while section two covers the use of bivalve shells in a wide range of

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Calibration of seawater temperature and δ 18Oseawater signals in Tridacna maxima’s δ 18Oshell record based on in situ data

Cited by 24 publications

References 48 publications

Evaluating the efficacy of the mollusc Tridacna crocea for reconstructing ancient sea‐surface temperatures in the Rock Islands of Palau, Micronesia

Evaluating the efficacy of the mollusc Tridacna crocea for reconstructing ancient sea‐surface temperatures in the Rock Islands of Palau, Micronesia

Geochemical and Microstructural Signals in Giant ClamTridacna maximaRecorded Typhoon Events at Okinotori Island, Japan

Archaeology and Sclerochronology of Marine Bivalves

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