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Van de Waal, Dedmer B; John, Uwe; Ziveri, Patrizia; Reichart, Gert-Jan; Hoins, Mirja; Sluijs, Appy; Rost, Bjoern (2013): General responses of Thoracosphaera heimii grown under a range of pCO2. doi:10.1594/PANGAEA.816429, Supplement to: Van de Waal, DB et al. (2013): Ocean Acidification Reduces Growth and Calcification in a Marine Dinoflagellate. PLoS ONE, 8(6), e65987, doi:10.1371/journal.pone.0065987

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Ocean acidification is considered a major threat to marine ecosystems and may particularly affect calcifying organisms such as corals, foraminifera and coccolithophores. Here we investigate the impact of elevated pCO2 and lowered pH on growth and calcification in the common calcareous dinoflagellate Thoracosphaera heimii. We observe a substantial reduction in growth rate, calcification and cyst stability of T. heimii under elevated pCO2. Furthermore, transcriptomic analyses reveal CO2 sensitive regulation of many genes, particularly those being associated to inorganic carbon acquisition and calcification. Stable carbon isotope fractionation for organic carbon production increased with increasing pCO2 whereas it decreased for calcification, which suggests interdependence between both processes. We also found a strong effect of pCO2 on the stable oxygen isotopic composition of calcite, in line with earlier observations concerning another T. heimii strain. The observed changes in stable oxygen and carbon isotope composition of T. heimii cysts may provide an ideal tool for reconstructing past seawater carbonate chemistry, and ultimately past pCO2. Although the function of calcification in T. heimii remains unresolved, this trait likely plays an important role in the ecological and evolutionary success of this species. Acting on calcification as well as growth, ocean acidification may therefore impose a great threat for T. heimii.
Further details:
Van de Waal, Dedmer B; John, Uwe; Ziveri, Patrizia; Reichart, Gert-Jan; Hoins, Mirja; Sluijs, Appy; Rost, Bjoern (2013): Seawater carbonate chemistry and growth, calcification of Thoracosphaera heimii in a laboratory experiment. doi:10.1594/PANGAEA.824705
#NameShort NameUnitPrincipal InvestigatorMethodComment
1TreatmentTreatVan de Waal, Dedmer B[µatm]
2Carbon dioxideCO2µmol/lVan de Waal, Dedmer B
3Growth rateµ1/dayVan de Waal, Dedmer B
4Carbon, organic, particulate, per cellPOCpg/#Van de Waal, Dedmer B
5Carbon, inorganic, particulate, per cellPIC/cellpg/#Van de Waal, Dedmer B
6RatioRatioVan de Waal, Dedmer BCalculatedPIC:POC
7CystsCysts%Van de Waal, Dedmer Bcompleted
8Fractionation of organic carbonepsilon pper milVan de Waal, Dedmer B
9Fractionation of calciteepsilon kper milVan de Waal, Dedmer B
10delta 18O, calcited18O calper mil PDBVan de Waal, Dedmer B
11delta 18O, dissolved inorganic carbond18O DICper milVan de Waal, Dedmer B
12delta 18O, calcited18O calper mil SMOWVan de Waal, Dedmer Bcalcite-water
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