Data Description

Bach, Lennart Thomas (2014): Experiment: changing carbonate chemistry influence on coccoliths formed by Emiliania huxleyi. doi:10.1594/PANGAEA.829081,
Supplement to: Bach, Lennart Thomas; Bauke, Christine; Meier, KJ Sebastian; Riebesell, Ulf; Schulz, Kai Georg (2012): Influence of changing carbonate chemistry on morphology and weight of coccoliths formed by Emiliania huxleyi. Biogeosciences, 9(8), 3449-3463, doi:10.5194/bg-9-3449-2012
The coccolithophore Emiliania huxleyi is a marine phytoplankton species capable of forming small calcium carbonate scales (coccoliths) which cover the organic part of the cell. Calcification rates of E. huxleyi are known to be sensitive to changes in seawater carbonate chemistry. It has, however, not yet been clearly determined how these changes are reflected in size and weight of individual coccoliths and which specific parameter(s) of the carbonate system drive morphological modifications. Here, we compare data on coccolith size, weight, and malformation from a set of five experiments with a large diversity of carbonate chemistry conditions. This diversity allows distinguishing the influence of individual carbonate chemistry parameters such as carbon dioxide (CO2), bicarbonate (HCO3- ), carbonate ion (CO32-), and protons (H+) on the measured parameters. Measurements of fine-scale morphological structures reveal an increase of coccolith malformation with decreasing pH suggesting that H+ is the major factor causing malformations. Coccolith distal shield area varies from about 5 to 11 µm2. Changes in size seem to be mainly induced by varying [HCO3- ] and [H+] although influence of [CO32-] cannot be entirely ruled out. Changes in coccolith weight were proportional to changes in size. Increasing CaCO3 production rates are reflected in an increase in coccolith weight and an increase of the number of coccoliths formed per unit time. The combined investigation of morphological features and coccolith production rates presented in this study may help to interpret data derived from sediment cores, where coccolith morphology is used to reconstruct calcification rates in the water column.
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Treatment *TreatmBach, Lennart Thomas *
2Carbon, inorganic, dissolved *DICµmol/kgBach, Lennart Thomas *
3Alkalinity, total *ATµmol/kgBach, Lennart Thomas *
4pH *pHBach, Lennart Thomas *
5Carbon dioxide, partial pressure *pCO2µatmBach, Lennart Thomas *
6Bicarbonate ion *[HCO3]-µmol/kgBach, Lennart Thomas *
7Carbonate ion *[CO3]2-µmol/kgBach, Lennart Thomas *
8Carbon dioxide *CO2µmol/kgBach, Lennart Thomas *
9Calcite saturation state *Omega CalBach, Lennart Thomas *
10Aragonite saturation state *Omega ArgBach, Lennart Thomas *
11Cell size *Cell sizeµmBach, Lennart Thomas *
12Particulate inorganic carbon production per cell *PIC prodpg/#/dayBach, Lennart Thomas *
13Mass *MassµgBach, Lennart Thomas *mean coccolith weight
14Mass, standard deviation *Mass std dev±Bach, Lennart Thomas *coccolith weight stdev
15Calcium carbonate production per cell *CaCO3 prodpg/#/dayBach, Lennart Thomas *
16Production *P1/dayBach, Lennart Thomas *number of coccoliths produced per day
17Surface area *SAµm2Bach, Lennart Thomas *coccolith distal shield area mean
18Surface area, standard deviation *SA std dev±Bach, Lennart Thomas *
19Length *lµmBach, Lennart Thomas *mean coccolith length
20Length, standard deviation *l std dev±Bach, Lennart Thomas *
21Width *wµmBach, Lennart Thomas *mean coccolith width
22Width, standard deviation *w std dev±Bach, Lennart Thomas *Measured *
23Length *lµmBach, Lennart Thomas *mean central area length
24Length, standard deviation *l std dev±Bach, Lennart Thomas *
25Width *wµmBach, Lennart Thomas *mean central area width
26Width, standard deviation *w std dev±Bach, Lennart Thomas *Measured *
27Height/width ratio *Height/widthBach, Lennart Thomas *mean coccolith length/coccolith width ratio
28Height/width ratio, standard deviation *Height/width std dev±Bach, Lennart Thomas *
29Height/width ratio *Height/widthBach, Lennart Thomas *mean central area length/central area width ratio
30Height/width ratio, standard deviation *Height/width std dev±Bach, Lennart Thomas *
31Surface area *SAµm2Bach, Lennart Thomas *mean calculated distal shield surface area
32Surface area, standard deviation *SA std dev±Bach, Lennart Thomas *
33Surface area *SAµm2Bach, Lennart Thomas *mean calculated central area surface area
34Surface area, standard deviation *SA std dev±Bach, Lennart Thomas *
35Coccoliths, malformed and incomplete *Cocco malformed%Bach, Lennart Thomas *mean malformation
36Coccoliths, malformed and incomplete, standard deviation *Cocco malformed std dev±Bach, Lennart Thomas *
1977 data points

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