Evidence of late Quaternary environmental change in a continental east Antarctic lake from lacustrine sedimentary pigment distributions

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Squier, A H ; Hodgson, D A ; Keely, B J (2005)

A sediment core from Progress Lake, one of the oldest lacustrine sequences in East Antarctica, contains distinct zones dating from a previous interglacial (most likely Marine Isotope Stage 5e, c. 125-115 kyr BP) and the present interglacial (Marine Isotope Stage 1), separated by a transition zone representing when the lake became sub-glacial. Profiles of fossil pigments, determined using high performance liquid chromatography and liquid chromatography-tandem mass spectrometry, show distinct differences in the photoautotrophic community during these two interglacial periods. The first was dominated by algae and purple phototrophic bacteria, with periods of photic zone euxinia indicated by pigments from anoxygenic phototrophic bacteria. Specific chlorophyll a derivatives reveal periods when grazing pressure impacted significantly on the phytoplankton community. The virtual absence of pigments in the transition zone reflects severe restriction of photoautotrophic activity, consistent with the take having become sub-glacial. Retreat of snow and ice in the late Holocene (3345 C-14 yr Bp) allowed establishment of a less diverse primary producer community, restricted to algae and cyanobacteria. Grazers were severely restricted and oxidative transformation was more important than during the previous interglacial. The pigment data provide a unique and detailed insight in to the evolution of the lake ecology over an interglacial-glacial-interglacial transition and strong evidence that the Marine Isotope Stage 5e interglacial in this region of coastal East Antarctica was several degrees warmer than at present.
  • References (89)
    89 references, page 1 of 9

    ABELLA, C., MONTESINOS, E. & GUERRERO, R. 1980. Field studies on the competition between purple and green sulfur bacteria for available light (Lake Siso, Spain). In DOKULIL, H., METZ, H. & JEWSON, D., eds. Developments in Hydrobiology, Vol. 3. The Hague: Junk, 173-181.

    AIRS, R.L. & KEELY, B.J. 2000. A novel approach for sensitivity enhancement in atmospheric pressure chemical ionisation liquid chromatography/mass spectrometry of chlorophylls. Rapid Communications in Mass Spectrometry, 14, 125-128.

    AIRS, R.L. & KEELY, B.J. 2003. A high resolution study of the chlorophyll and bacteriochlorophyll pigment distributions in a calcite/gypsum microbial mat. Organic Geochemistry, 34, 539-551.

    AIRS, R.L., ATKINSON, J.E. & KEELY, B.J. 2001. Development and application of a high resolution liquid chromatographic method for the analysis of complex pigment distributions. Journal of Chromatography A, 917, 167-177.

    AIRS R.L., JIE, C. & KEELY, B.J. 2000. A novel sedimentary chlorin: structural evidence for a chlorophyll origin for aetioporphyrins. Organic Geochemistry, 31, 1253-1256.

    BORREGO, C.M., GARCIA-GIL, L.J., BANERAS, L. & BRUNET, R.C. 1993. Changes in the composition of phototrophic sulphur bacterial communities in three basins of Lake Banyoles (Spain). Verhein International Verein Limnologie, 25, 720-725.

    BORREGO, C.M., GEROLA, P.D., MILLER, M. & COX, R.P. 1999. Light intensity effects on pigment composition and organisation in the green sulfur bacterium Chlorobium tepidum. Photosynthesis Research, 59, 159-166.

    BORREGO, C.M., GARCIA-GIL, J., CRISTINA, X.P., VILA, X. & ABELLA, C.A. 1998. Occurrence of new bacteriochlorophyll d forms in natural populations of green photosynthetic sulfur bacteria. FEMS Microbiology Ecology, 26, 257-267.

    BORREGO, C.M., GARCIA-GIL, L.J., VILA, X., CRISTINA, X.P., FIGUERAS, J.B. & ABELLA, C.A. 1997. Distribution of bacteriochlorophyll homologs in natural populations of brown-colored phototrophic sulfur bacteria. FEMS Microbiology Ecology, 24, 301-309.

    BUFFAN-DUBAU, E., DE WIT, R. & CASTEL, J. 1996. Feeding selectivity of the harpacticoid copepod Canuella perplexa in benthic muddy environments demonstrated by HPLC analyses of chlorin and carotenoid pigments. Marine Ecology Progress Series, 137, 71-82.

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