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)00177-8Full text not available from this repository.
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
|Programmes:||BAS Programmes > Antarctic Science in the Global Context (2000-2005) > Signals in Antarctica of Past Global Changes|
|Date made live:||23 Mar 2012 12:05|
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