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| Titel |
Influence of CO2 and nitrogen limitation on the coccolith volume of Emiliania huxleyi (Haptophyta) |
| VerfasserIn |
M. N. Müller, L. Beaufort, O. Bernard, M. L. Pedrotti, A. Talec, A. Sciandra |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 9, no. 10 ; Nr. 9, no. 10 (2012-10-30), S.4155-4167 |
| Datensatznummer |
250007345
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| Publikation (Nr.) |
 copernicus.org/bg-9-4155-2012.pdf |
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| Zusammenfassung |
| Coccolithophores, a key phytoplankton group, are one of the most studied
organisms regarding their physiological response to ocean
acidification/carbonation. The biogenic production of calcareous coccoliths
has made coccolithophores a promising group for paleoceanographic research
aiming to reconstruct past environmental conditions. Recently, geochemical
and morphological analyses of fossil coccoliths have gained increased
interest in regard to changes in seawater carbonate chemistry. The
cosmopolitan coccolithophore Emiliania huxleyi (Lohm.) Hay and
Mohler was cultured over a range of pCO2 levels in controlled laboratory
experiments under nutrient replete and nitrogen limited conditions.
Measurements of photosynthesis and calcification revealed, as
previously published, an increase in particulate organic carbon production and a moderate
decrease in calcification from ambient to elevated pCO2. The enhancement in
particulate organic carbon production was accompanied by an increase in cell
diameter. Changes in coccolith volume were best correlated with the
coccosphere/cell diameter and no significant correlation was found between
the coccolith volume and the particulate inorganic carbon production. The
conducted experiments revealed that the coccolith volume of E. huxleyi is variable
with aquatic CO2 concentration but its sensitivity is rather small in
comparison with its sensitivity to nitrogen limitation. Comparing coccolith
morphological and geometrical parameters like volume, mass and size to
physiological parameters under controlled laboratory conditions is an
important step to understand variations in fossil coccolith geometry. |
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