nerc.ac.uk

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

Full text not available from this repository. (Request a copy)

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: Publication - Article
Digital Object Identifier (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

Actions (login required)

View Item View Item