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Morphology of Emiliania huxleyi coccoliths on the North West European shelf – is there an influence of carbonate chemistry?

Morphology of Emiliania huxleyi coccoliths on the North West European shelf – is there an influence of carbonate chemistry?
Morphology of Emiliania huxleyi coccoliths on the North West European shelf – is there an influence of carbonate chemistry?
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 (?calcite). One bioassay in particular (E4 from the southern North Sea) yielded unambiguous results – in this bioassay exponential growth from a low level occurred with no artificial stimulation and coccosphere numbers increased ten-fold 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 ?atm). 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.
4531-4561
Young, J.R.
d730462f-1f5f-449c-85f1-5ab3ec68983c
Poulton, A.J.
14bf64a7-d617-4913-b882-e8495543e717
Tyrrell, T.
6808411d-c9cf-47a3-88b6-c7c294f2d114
Young, J.R.
d730462f-1f5f-449c-85f1-5ab3ec68983c
Poulton, A.J.
14bf64a7-d617-4913-b882-e8495543e717
Tyrrell, T.
6808411d-c9cf-47a3-88b6-c7c294f2d114

Young, J.R., Poulton, A.J. and Tyrrell, T. (2014) Morphology of Emiliania huxleyi coccoliths on the North West European shelf – is there an influence of carbonate chemistry? Biogeosciences, 11 (3), 4531-4561. (doi:10.5194/bgd-11-4531-2014).

Record type: Article

Abstract

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 (?calcite). One bioassay in particular (E4 from the southern North Sea) yielded unambiguous results – in this bioassay exponential growth from a low level occurred with no artificial stimulation and coccosphere numbers increased ten-fold 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 ?atm). 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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More information

Published date: 24 March 2014
Organisations: Ocean and Earth Science, Marine Biogeochemistry

Identifiers

Local EPrints ID: 363459
URI: http://eprints.soton.ac.uk/id/eprint/363459
PURE UUID: 4563fbe1-75af-415d-86f0-29aa39404f37
ORCID for T. Tyrrell: ORCID iD orcid.org/0000-0002-1002-1716

Catalogue record

Date deposited: 25 Mar 2014 10:17
Last modified: 10 Jul 2020 00:25

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