Effects of seawater pH on growth and skeletal U/Ca ratios of Acropora digitifera coral polyps

Details Effects of seawater pH on growth and skeletal U/Ca ratios of Acropora digitifera coral polyps Effects of seawater pH on growth and skeletal U/Ca ratios of Acropora digitifera coral polyps

Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3812809i&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 12, CiteID L12809

Physics

Geophysics

Biogeosciences: Biomineralization, Biogeosciences: Paleoclimatology And Paleoceanography (3344, 4900), History Of Geophysics: Ocean Sciences, Paleoceanography: Anthropogenic Effects (1803, 4802), Paleoceanography: Corals (4220)

Scientific paper

The impact of ocean acidification caused by the increasing atmospheric CO2 has been studied in marine calcifiers, including hermatypic corals. However, the effect of elevated pCO2 on the early developmental life-cycle stage of corals has been little studied. In this study, we reared polyps of Acropora digitifera in seawater at pHT 6.55, 7.31, 7.64, 7.77, and 8.03, controlled by CO2 bubbling. We measured the dry weights of polyp skeletons after the 40-d experiment to investigate the relationship between the seawater aragonite saturation state and polyp growth. In addition, we measured skeletal U/Ca ratio to estimate their pH dependence. Skeletal weights of coral polyps increased with the aragonite saturation state and reached an apparent saturation plateau above pH 7.77. U/Ca ratios had a strong inverse relationship with pH and a negligible relationship with skeletal growth rate (polyp weight), suggesting that skeletal U/Ca could be useful for reconstructing paleo-pH.

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