Genomic identification of the long-chain alkenone producer in freshwater Lake Toyoni, Japan: implications for temperature reconstructions

Plancq, J. , McColl, J. L., Bendle, J. A., Seki, O., Couto, J. M., Henderson, A. C.G., Yamashita, Y., Kawamura, K. and Toney, J. L. (2018) Genomic identification of the long-chain alkenone producer in freshwater Lake Toyoni, Japan: implications for temperature reconstructions. Organic Geochemistry, 125, pp. 189-195. (doi: 10.1016/j.orggeochem.2018.09.011)

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Abstract

Identifying the lacustrine haptophyte species that produce long-chain alkenones (LCAs) is essential prior to down-core temperature reconstructions. Here, we investigated the identity of LCA-producing species from Lake Toyoni, Japan using 18S ribosomal DNA (rDNA) and organic geochemical analyses. The rDNA analyses identified eighteen operational taxonomic units (OTUs) of which only one fell within the haptophyte phylotype. This haptophyte belongs to the Group I phylotype, as supported by the LCA distribution found in surface and down-core sediments, and is closely related to a haptophyte found in Lake BrayaSø (Greenland). The inferred temperature using the Greenland calibration is very close to the Lake Toyoni surface temperature recorded during the spring/early summer season, when the LCA-producing haptophyte is likely to bloom. We therefore suggest that the temperature calibration from the Lake BrayaSø, Greenland is a suitable calibration for down-core temperature reconstructions at Lake Toyoni.

Item Type:Articles
Additional Information:Also funded by the ERC project (637776) ALKENoNE to JLT.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Plancq, Dr Julien and Toney, Professor Jaime
Authors: Plancq, J., McColl, J. L., Bendle, J. A., Seki, O., Couto, J. M., Henderson, A. C.G., Yamashita, Y., Kawamura, K., and Toney, J. L.
College/School:College of Science and Engineering > School of Geographical and Earth Sciences
Journal Name:Organic Geochemistry
Publisher:Elsevier
ISSN:0146-6380
ISSN (Online):1873-5290
Published Online:18 September 2018
Copyright Holders:Copyright © 2018 The Authors
First Published:First published in Organic Geochemistry 125:189-195
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
586271NERC DTG 2011-15Mary Beth KneafseyNatural Environment Research Council (NERC)NE/J500252/1R&I - RESEARCH STRATEGY & INNOVATION