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Biometry of detached Emiliania huxleyi coccoliths along the Patagonian Shelf

Poulton, Alex J., Young, Jeremy R., Bates, Nicholas R. and Balch, William M. (2011) Biometry of detached Emiliania huxleyi coccoliths along the Patagonian Shelf Marine Ecology Progress Series, 443, pp. 1-17. (doi:10.3354/meps09445).

Record type: Article

Abstract

The biometry (morphology, size) of coccoliths of the coccolithophorid Emiliania huxleyi has implications for their calcite content and cellular rates of calcification. We investigated the biometry of detached coccoliths of E. huxleyi in surface waters during the December 2008 ‘Coccolithophores of the Patagonian Shelf (COPAS’08)’ expedition. Two morphotypes of E. huxleyi were abundant along the shelf, although with different distributions: Morphotype A dominated waters on the shelf and at the northern end of the shelf, while Morphotype B/C
dominated offshore and within the main coccolithophore bloom. The 2 morphotypes had opposite relationships to environmental variables along the shelf: Morphotype B/C was abundant in cold (<10°C), nutrient-rich (>10 ?mol nitrate kg?1) waters with calcite saturation states of ~3.5, whereas Morphotype A was abundant in warm (>10°C), nutrientpoor 0.1 to 10 ?mol nitrate kg?1) waters with higher >4.5) calcite saturation states. These findings support previous suggestions that E. huxleyi morphotypes
are distinct ecotypes. Furthermore, we suggest that Morphotype B/C is a Southern Ocean ecotype. Measurements of coccolith distal shield length (total range: 1.8 to 4.4 ?m) indicated considerable physiological and/or phenotypic variability along the shelf and within each morphotype. Conversion of distal shield length into estimates of coccolith calcite showed that the E. huxleyi population was producing coccoliths with low median calcite quotas (overall
average ± SD, 0.015 ± 0.006 pmol C) relative to other
studies of field populations.

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More information

Published date: 2011
Keywords: Emiliania huxleyi, Calcification, Patagonian Shelf, Coccoliths, Morphotypes, COPAS’08
Organisations: Marine Biogeochemistry, Ocean Biochemistry & Ecosystems

Identifiers

Local EPrints ID: 208815
URI: http://eprints.soton.ac.uk/id/eprint/208815
PURE UUID: 9df059d9-9585-4747-b4d5-9a09eb13d5eb

Catalogue record

Date deposited: 23 Jan 2012 13:33
Last modified: 18 Jul 2017 10:48

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Contributors

Author: Alex J. Poulton
Author: Jeremy R. Young
Author: William M. Balch

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