Seasonal changes of the photosynthetic capacity of the Antarctic macroalga Adenocystis utricularis (Bory) Skottsberg |
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Authors: | Ryszard Gutkowski Stanisław Maleszewski |
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Institution: | (1) University of Warsaw, Branch in Bia ystok, Institute of Biology, wierkowa 20b, PL-15-950 Bia ystok, Poland;(2) Department of Photosynthesis, University of Warsaw, Faculty of Biology, Krakowskie Przedmie cie 26/28, PL-00-927 Warszawa, Poland |
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Abstract: | Summary Photosynthetic oxygen evolution from Antarctic macroalgaAdenocystis utricularis, collected from littoral zone of Admiralty Bay of King George Island (South Shetland), was measured under standard laboratory conditions during a 9-month study period. During autumn and winter the photosynthetic apparatus of the alga revealed an increased capacity to use low irradiance. This coincided with increasing concentrations of chlorophyll a+c. In parallel respiration rates measured at the average monthly water temperature were lower in winter than in summer. |
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