δ18O Analyses of the Humpbacked Conch (Gibberulus gibberulus): Evaluating a Proxy for Reconstructing Sea-Surface Temperature at Chelechol ra Orrak, Palau

Dodrill, Taylor; Jew, Nicholas P.; Fitzpatrick, Scott M.

doi:10.1080/14614103.2017.1378159

Cited by 1 publication

(6 citation statements)

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“…gibberulus (after Dodrill et al . ; see also Grossman and Ku's () mollusc c aragonite, T (°C) = 21.8 – 4.69*(δ 18 O aragonite – δ w – 0.2)) and T . crocea (equation (2) of Duprey et al .…”

Section: Discussionmentioning

confidence: 88%

“…For Dodrill et al . (), prehistoric SST estimations suggest that the nearshore environments of Palau were slightly warmer than those today, by approximately 1.0–2.0°C. Comparisons between modern and archaeological contexts for each species aids in evaluating the efficacy of each species’ ability to reliably record ambient water temperatures, and also provides information related to SST within the region during times of human occupation in the archipelago.…”

Section: Discussionmentioning

confidence: 93%

“…For example, using similar methodologies, Jew and Fitzpatrick () demonstrated the efficacy of the Indo‐Pacific bivalve species Atactodea striata , and recently, Dodrill et al . () further illustrated the ability of the gastropod Gibberulus gibberulus to record their respective ambient water temperatures. Although these studies were conducted at the site of Chelechol ra Orrak, about 3.5 km away from Metuker ra Bisech, comparison between isotopic signatures and estimated SST for all three species from archaeological contexts of different ages demonstrates a palaeo‐nearshore multiproxy approach for the Palau region (Figures and ).…”

Section: Discussionmentioning

confidence: 95%

“…Gibberulus gibberulus , for example, presented isotopic signatures between –2.9‰ and –1.8‰ (excluding the anomalous –1.3‰; see Dodrill et al . ). For both archaeological components at Metuker ra Bisech, T. crocea yielded isotopic signatures ranging between –2.9‰ and –1.4‰.…”

Section: Discussionmentioning

confidence: 97%

“…In contrast, Dodrill et al . () compared modern and archaeological G. gibberulus shells dated to 1300 calBP. For Dodrill et al .…”

Section: Discussionmentioning

confidence: 99%

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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: 88%

Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 97%

“…In contrast, Dodrill et al . () compared modern and archaeological G. gibberulus shells dated to 1300 calBP. For Dodrill et al .…”

Section: Discussionmentioning

confidence: 99%