Calibration of stable oxygen isotopes in Siderastrea radians (Cnidaria: Scleractinia): Implications for slow-growing corals

Christopher S. Moses, Peter K Swart, Richard E. Dodge

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Geochemical proxies in the skeletons of corals used for the purpose of reconstructing environmental records have typically been obtained from relatively fast-growing corals (usually >8 mm yr-1) and from only a few key genera (most commonly Porites and Montastraea). In many areas, however, there are no suitable fast-growing corals available for such reconstructions. Here, we investigate the potential of Siderastrea radians, a slow-growing Atlantic and Caribbean zooxanthellate coral, as an archive of sea surface temperature (SST) and salinity over the period from 1891 to 2002. Sampling the skeleton of three corals from the Cape Verde Islands, we were able to reproduce a clear seasonal signal, but with limited correlation to monthly SST, arising from inadequate chronologic constraint of the individual samples. The SST-δ18O calibration slopes for different sampling scales on several cores can range from about-9°C%-1 to +2°C% -1 (compared to other published values of around-5 to-4°C% -1). Careful treatment produced a δ18O-SST calibration equation where SST(°C) = 12.56(±1.20)-3.86(±0.39) *(δc-(δw). The recognition of the limitations of calibration at such small growth rates due to skeletal complexity and suspicion of environmental interferences suggests the need for careful consideration in the interpretation of climate proxy results from S. radians and other slow-growing corals.

Original languageEnglish (US)
Article numberQ09007
JournalGeochemistry, Geophysics, Geosystems
Volume7
Issue number9
DOIs
StatePublished - Sep 2006

Fingerprint

Oxygen Isotopes
sea surface temperature
oxygen isotopes
oxygen isotope
coral
stable isotope
Calibration
calibration
musculoskeletal system
Temperature
Cape Verde
skeleton
sampling
Sampling
salinity
sea surface salinity
climate
slopes
interference

Keywords

  • Cape verde islands
  • Coral
  • Isotopes
  • Paleoclimate
  • Sampling strategy
  • Siderastrea

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

Calibration of stable oxygen isotopes in Siderastrea radians (Cnidaria : Scleractinia): Implications for slow-growing corals. / Moses, Christopher S.; Swart, Peter K; Dodge, Richard E.

In: Geochemistry, Geophysics, Geosystems, Vol. 7, No. 9, Q09007, 09.2006.

Research output: Contribution to journalArticle

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