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| Titel |
Morphology of Emiliania huxleyi coccoliths on the northwestern European shelf – is there an influence of carbonate chemistry? |
| VerfasserIn |
J. R. Young, A. J. Poulton, T. Tyrrell |
| 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. 17 ; Nr. 11, no. 17 (2014-09-10), S.4771-4782 |
| Datensatznummer |
250117582
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| Publikation (Nr.) |
 copernicus.org/bg-11-4771-2014.pdf |
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| Zusammenfassung |
| Within the context of the UK Ocean Acidification project, Emiliania huxleyi (type A)
coccolith morphology was examined from samples collected during cruise D366.
In particular, a morphometric study of coccolith size and degree of
calcification was made on scanning electron microscope images of samples
from shipboard CO2 perturbation experiments and from a set of
environmental samples with significant variation in calcite saturation state
(Ωcalcite). One bioassay in particular (E4 from the southern
North Sea) yielded unambiguous results – in this bioassay exponential growth
from a low initial cell density occurred with no nutrient enrichment and
coccosphere numbers increased tenfold during the experiment. The samples
with elevated CO2 saw significantly reduced coccolithophore growth.
However, coccolithophore morphology was not significantly affected by the
changing CO2 conditions even under the highest levels of perturbation
(1000 μatm CO2). Environmental samples similarly showed no
correlation of coccolithophore morphology with calcite saturation state.
Some variation in coccolith size and degree of calcification does occur but
this seems to be predominantly due to genotypic differentiation between
populations on the shelf and in the open ocean. |
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