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Influence of CO2 and nitrogen limitation on the coccolith volume of Emiliania huxleyi (Haptophyta)
Citation
Muller, MN and Beaufort, L and Bernard, O and Pedrotti, ML and Talec, A and Sciandra, A, Influence of CO2 and nitrogen limitation on the coccolith volume of Emiliania huxleyi (Haptophyta), Biogeosciences, 9, (10) pp. 4155-4167. ISSN 1726-4170 (2012) [Refereed Article]
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Copyright Statement
Licensed under Creative Commons Attribution 3.0 Unported (cc BY 3.0) http://creativecommons.org/licenses/by/3.0/
DOI: doi:10.5194/bg-9-4155-2012
Abstract
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.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Keywords: | ocean acidification, coccolith volume, Emiliania huxleyi |
| Research Division: | Earth Sciences |
| Research Group: | Oceanography |
| Research Field: | Biological oceanography |
| Objective Division: | Environmental Policy, Climate Change and Natural Hazards |
| Objective Group: | Understanding climate change |
| Objective Field: | Effects of climate change on the South Pacific (excl. Australia and New Zealand) (excl. social impacts) |
| UTAS Author: | Muller, MN (Dr Marius Muller) |
| ID Code: | 80383 |
| Year Published: | 2012 |
| Web of Science® Times Cited: | 38 |
| Deposited By: | IMAS Research and Education Centre |
| Deposited On: | 2012-10-31 |
| Last Modified: | 2013-06-06 |
| Downloads: | 610 View Download Statistics |
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