Light-temperature interactions in the control of photosynthesis in Antarctic phytoplankton |
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Authors: | Max M Tilzer malte Elbrächter Winfried W Gieskes Bärbel Beese |
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Institution: | (1) Limnologisches Institut, Universität Konstanz, Postfach 5560, D-7750 Konstanz, Federal Republic of Germany;(2) Litoral Station List, Biologische Anstalt Helgoland, D-2282 List/Sylt, Federal Republic of Germany;(3) Netherlands Institute for Sea Research, NL-1790 Ab den Burg, Texel, The Netherlands |
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Abstract: | Summary During October/November 1983 photosynthetic responses of natural phytoplankton from the Scotia Sea and Bransfield strait to light and temperature were examined in incubators. Both assimilation numbers at saturating light levels and the slopes of the light-limited portions of the photosynthesis versus irradiance curves were smaller than in algae from lower latitudes. However, both parameters increased significantly with rising temperatures. Light-saturated photosynthesis on the average exhibited a Q10-value of ca. 4.2 between-1.5°C and +2°C. Light-limited photosynthesis between-1.5°C and +5°C rose at a rate corresponding to a Q10-value of roughly 2.6. Above +5°C, temperature enhancement of both light-saturated and light-limited photosynthetic rates was minimal or absent. Our results suggest that under extremely low temperatures light-limited photosynthetic rates become temperature-dependent due to changes in maximum quantum yields. |
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