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| Titel |
Environmental controls on the Emiliania huxleyi calcite mass |
| VerfasserIn |
M. T. Horigome, P. Ziveri, M. Grelaud, K.-H. Baumann, G. Marino, P. G. Mortyn |
| 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 ; 11, no. 8 ; Nr. 11, no. 8 (2014-04-24), S.2295-2308 |
| Datensatznummer |
250117375
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| Publikation (Nr.) |
 copernicus.org/bg-11-2295-2014.pdf |
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| Zusammenfassung |
| Although ocean acidification is expected to impact (bio) calcification by
decreasing the seawater carbonate ion concentration,
[CO32−], there is evidence of nonuniform response of
marine calcifying plankton to low seawater [CO32−]. This
raises questions about the role of environmental factors other than
acidification and about the complex physiological responses behind
calcification. Here we investigate the synergistic effect of multiple
environmental parameters, including seawater temperature, nutrient (nitrate
and phosphate) availability, and carbonate chemistry on the coccolith
calcite mass of the cosmopolitan coccolithophore Emiliania huxleyi, the most abundant species
in the world ocean. We use a suite of surface (late Holocene) sediment
samples from the South Atlantic and southwestern Indian Ocean taken from
depths lying above the modern lysocline (with the exception of eight samples
that are located at or below the lysocline). The coccolith calcite mass in
our results presents a latitudinal distribution pattern that mimics the main
oceanographic features, thereby pointing to the potential importance of
seawater nutrient availability (phosphate and nitrate) and carbonate
chemistry (pH and pCO2) in determining coccolith mass by affecting
primary calcification and/or the geographic distribution of E. huxleyi morphotypes. Our
study highlights the importance of evaluating the combined effect of several
environmental stressors on calcifying organisms to project their
physiological response(s) in a high-CO2 world and improve
interpretation of paleorecords. |
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