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Last Glacial Maximum sea surface temperatures and sea ice distribution in the South Atlantic and Southern Ocean

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Gersonde, R. , Abelmann, A. , Arz, H. , Brathauer, U. , Censarek, B. , Hale, W. , Kuhn, G. , Mulitza, S. , Niebler, S. , Paetzold, J. , Segl, M. , Sieger, R. , Zielinski, U. and Wefer, G. (1998): Last Glacial Maximum sea surface temperatures and sea ice distribution in the South Atlantic and Southern Ocean , AGU 1998 Fall Meeting, San Francisco, Eos Trans. Suppl. Abstract OS22F-08. .
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Abstract:

1. A deep chlorophyll maximum dominated by Cryptomonas phaseolus, Cryptomonas undulata and often also by Cryptomonas rostratiformis was observed near the summer chemocline of the dimictic, meso-eutrophic lake Schlachtensee from 1990 to 1996.2. The cryptophyte populations occupied a stratified water column of about 2 m thickness just below the oxycline. They were never observed in the summer epilimnion. In their habitat, oxygen concentration was always lower than 1 mg l-1 and light was growth-limiting, whereas nitrogen and phosphorus were available at high concentrations.3. A very large portion of the populations stayed in the anaerobic, sulphide-containing water layer. Below the chemocline purple and green sulphur bacteria coexisted.4. The cryptophyte populations were maintained by in situ growth due to low-light adapted photosynthesis and not due to phagotrophy.5. Short-term changes in the light climate near the chemocline could explain the coexistence of different cryptophyte species.

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