Skeletal oxygen and carbon isotope compositions of Acropora coral primary polyps experimentally cultured at different temperatures

Kozue Nishida, Kei Ishikawa, Akira Iguchi, Yasuaki Tanaka, Mizuho Sato, Toyoho Ishimura, Mayuri Inoue, Takashi Nakamura, Kazuhiko Sakai, Atsushi Suzuki

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We investigated temperature and growth-rate dependency of skeletal oxygen and carbon isotopes in primary polyps of Acropora digitifera (Scleractinia: Acroporidae) by culturing them at 20, 23, 27, or 31°C. Calcification was most rapid at 27 and 31°C. We obtained a δ18O-temperature relationship (-0.18‰ °C-1) consistent with reported ranges for Porites, indicating that juvenile Acropora polyps can be used for temperature reconstruction. A growth-rate dependency of skeletal isotopes was detected in the experimental polyps cultured at lower water temperatures, when the skeletal growth rate of these polyps was also low. The estimated upper calcification flux limit for a kinetic isotope effect to be observed in the δ18O-growth rate relationship (∼0.4-0.7 g CaCO3 cm-2 yr-1) was similar to the calcification flux in Porites corresponding to a linear extension rate of 5 mm yr-1, the maximum rate at which the kinetic isotope effect is evident. This result suggests that the calcification flux can be used as a measure of growth rate-related isotope fractionation, that is, the kinetic isotope effect, in corals of different genera and at different growth stages.

Original languageEnglish
Pages (from-to)2840-2849
Number of pages10
JournalGeochemistry, Geophysics, Geosystems
Volume15
Issue number7
DOIs
Publication statusPublished - Jul 2014

Keywords

  • Acropora digitifera
  • coral
  • kinetic isotope effect
  • stable isotopes
  • temperature experiment

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

Fingerprint Dive into the research topics of 'Skeletal oxygen and carbon isotope compositions of Acropora coral primary polyps experimentally cultured at different temperatures'. Together they form a unique fingerprint.

  • Cite this

    Nishida, K., Ishikawa, K., Iguchi, A., Tanaka, Y., Sato, M., Ishimura, T., Inoue, M., Nakamura, T., Sakai, K., & Suzuki, A. (2014). Skeletal oxygen and carbon isotope compositions of Acropora coral primary polyps experimentally cultured at different temperatures. Geochemistry, Geophysics, Geosystems, 15(7), 2840-2849. https://doi.org/10.1002/2014GC005322