Production and temperature sensitivity of long chain alkenones in the cultured haptophyte Pseudoisochrysis paradoxa

Theroux, S., Toney, J. , Amaral-Zettler, L. and Huang, Y. (2013) Production and temperature sensitivity of long chain alkenones in the cultured haptophyte Pseudoisochrysis paradoxa. Organic Geochemistry, 62, pp. 68-73. (doi: 10.1016/j.orggeochem.2013.07.006)

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The alkenone unsaturation index (U<sub>37</sub><sup>K</sup> or U<sub>37</sub><sup>K′</sup>) serves as a critical tool for reconstructing temperature in marine environments. Lacustrine haptophyte algae are genetically distinct from their ubiquitous and well studied marine counterparts, and the unknown species-specific genetic imprints on long chain alkenone production by lacustrine species have hindered the widespread application of the U37<sup>K</sup> temperature proxy to lake sediment records. The haptophyte Pseudoisochrysis paradoxa produces alkenones but its U37<sup>K</sup> calibration has never been determined. It has an alkenone fingerprint abundant in tetraunsaturated alkenones, a hallmark of lacustrine environments. We present here the first calibration of the U37<sup>K</sup> index to temperature for a culture of P. paradoxa. We found that the U37<sup>K</sup> index accurately captured the alkenone response to temperature whereas the U37<sup>K′</sup> index failed to do so, with U37<sup>K′</sup> values below 0.08 projecting to two different temperature values. Our results add a fifth species-specific U37<sup>K</sup> calibration and provide another line of evidence that different haptophyte species require different U37<sup>K</sup> calibrations. The findings also highlight the necessary inclusion of the C<sub>37:4</sub> alkenone when reconstructing temperatures from P. paradoxa-derived alkenone records.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Toney, Professor Jaime
Authors: Theroux, S., Toney, J., Amaral-Zettler, L., and Huang, Y.
Subjects:Q Science > Q Science (General)
Q Science > QD Chemistry
Q Science > QE Geology
Q Science > QK Botany
College/School:College of Science and Engineering > School of Geographical and Earth Sciences
Research Group:BECS Biomarkers for Environmental and Climate Science
Journal Name:Organic Geochemistry
Publisher:Pergamon (Elsevier)
ISSN (Online):1873-5290
Copyright Holders:Copyright © 2013 The Authors
First Published:First published online in Organic Chemistry
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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