Skip to content

Research at St Andrews

Influences of coral genotype and seawater pCO2 on skeletal Ba/Ca and Mg/Ca in cultured massive Porites spp. corals

Research output: Contribution to journalArticle

Abstract

Coral skeletal Ba/Ca is a proxy for seawater Ba/Ca, used to infer oceanic upwelling and terrigenous runoff while [Mg2+] is implicated in the control of coral biomineralisation. We cultured large individuals (>12 cm diameter) of 3 genotypes of massive adult Porites spp. corals over a range of seawater pCO2 to test how atmospheric CO2 variations affect skeletal Ba/Ca and Mg/Ca. We identified the skeleton deposited after a 5 month acclimation period and analysed the skeletal Ba/Ca and Mg/Ca by secondary ion mass spectrometry. Skeletal Mg/Ca varies significantly between some duplicate colonies of the same coral genotype hampering identification of genotype and seawater pCO2 effects. Coral aragonite:seawater Ba/Ca partition coefficients (KD Ba/Ca) do not vary significantly between duplicate colonies of the same coral genotype. We observe large variations in KD Ba/Ca between different massive Porites spp. coral genotypes irrespective of seawater pCO2. These variations do not correlate with coral calcification, photosynthesis or respiration rates or with skeletal KD Mg/Ca or KD Sr/Ca. Seawater pCO2 does not significantly affect KD Ba/Ca in 2 genotypes but KD Ba/Ca is significantly higher at 750 μatm seawater pCO2 than at 180 μatm in 1 P. lutea genotype. Genotype specific variations in KD Ba/Ca between different Porites spp. could yield large errors (~250%) in reconstructions of seawater Ba when comparing Ba/Ca between corals. Analysis of fossil coral specimens deposited at low seawater pCO2, may underestimate past seawater Ba/Ca and ocean upwelling/freshwater inputs when compared with modern specimens but the effect is small in comparison with the observed difference between coral genotypes.
Close

Details

Original languageEnglish
JournalPalaeogeography, Palaeoclimatology, Palaeoecology
VolumeIn press
Early online date11 Jun 2018
DOIs
Publication statusE-pub ahead of print - 11 Jun 2018

    Research areas

  • Calcification, Photosynthesis, Respiration, KD Ba/Ca, KD Mg/Ca, Coral

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by author

  1. The effect of ocean acidification on tropical coral calcification: insights from calcification fluid DIC chemistry

    Allison, N., Cole, C., Hintz, C., Hintz, K., Rae, J. & Finch, A., 10 Oct 2018, In : Chemical Geology. 497, p. 162-169 8 p.

    Research output: Contribution to journalArticle

  2. Effects of seawater pCO2 and temperature on calcification and productivity in the coral genus Porites spp. an exploration of potential interaction mechanisms

    Cole, C., Finch, A. A., Hintz, C., Hintz, K. & Allison, N., Jun 2018, In : Coral Reefs. 37, 2, p. 471-481 11 p.

    Research output: Contribution to journalArticle

  3. Understanding cold bias: variable response of skeletal Sr/Ca to seawater pCO2 in acclimated massive Porites corals

    Cole, C. S., Finch, A. A., Hintz, C., Hintz, K. & Allison, N., 31 May 2016, In : Scientific Reports. 6, 26888.

    Research output: Contribution to journalArticle

  4. Corals concentrate dissolved inorganic carbon to facilitate calcification

    Allison, N., Cohen, I., Finch, A. A., Erez, J. & Tudhope, A. W., 22 Dec 2014, In : Nature Communications. 5, 5741.

    Research output: Contribution to journalArticle

Related by journal

  1. Palaeogeography, Palaeoclimatology, Palaeoecology (Journal)

    Michael Ian Bird (Member of editorial board)
    2006 → …

    Activity: Publication peer-review and editorial work typesEditor of research journal

Related by journal

  1. Palynology and micropalaeontology of the Pliocene - Pleistocene transition in outcrop from the western Caspian Sea, Azerbaijan: potential links with the Mediterranean, Black Sea and the Arctic Ocean?

    Richards, K., van Baak, C. G. C., Athersuch, J., Hoyle, T. M., Stoica, M., Austin, W. E. N., Cage, A. G., Wonders, A. A. H., Marret, F. & Pinnington, C. A., 15 Dec 2018, In : Palaeogeography, Palaeoclimatology, Palaeoecology. 511, p. 119-143

    Research output: Contribution to journalArticle

ID: 253316146

Top