Sedimentary pigments as markers for environmental change in an Antarctic lake

Squier, A.H.; Hodgson, D.A.; Keely, B.J.. 2002 Sedimentary pigments as markers for environmental change in an Antarctic lake. Organic Geochemistry, 33 (12). 1655-1665. 10.1016/S0146-6380(02)00177-8

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Abstract/Summary

Fossil pigments were identified in a sediment core from Kirisjes Pond, a small lake in the Larsemann Hills, east Antarctica, using reversed-phase HPLC and LC–MS/MS. Chlorophyll a- and b-derived components indicate the presence of oxygenic primary producers; steryl chlorin esters provide evidence of grazing, while shifts in their esterifying sterol composition record changes in the primary producer community. Bacteriochlorophyll c- and d-derived components, indicative of photic zone anoxia, were identified with structural variations including extensive alkylation in the macrocycle up to C6. The pigment distribution reveals a change from oxygenated freshwater to a stratified water body with development of photic zone anoxia. This coincides with a marine incursion identified from diatom records and is followed by re-isolation and reversion to oxygenated freshwater conditions

Item Type:	Article
Identification Number/DOI:	10.1016/S0146-6380(02)00177-8
Programmes:	BAS Programmes > Antarctic Science in the Global Context (2000-2005) > Signals in Antarctica of Past Global Changes
ISSN:	0146-6380
Date made live:	23 Mar 2012 12:05
URI:	http://nora.nerc.ac.uk/id/eprint/17443

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