Journal
ORGANIC GEOCHEMISTRY
Volume 33, Issue 12, Pages 1655-1665Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0146-6380(02)00177-8
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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 C-6. 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. (C) 2002 Elsevier Science Ltd. All rights reserved.
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