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Thomas, D.N.; Baumann, M.E.M.; Gleitz, M.
Efficiency of carbon assimilation and photoacclimation in a small unicellular
species from the Weddell Sea (Antarctica): Influence of temperature and irradiance
Journal of Experimental Marine Biology and Ecology
J Exp Mar Biol Ecol
photosynthesis; Psw; Weddell Sea;
; temperature effects; irradiance; light effects; acclimation; respiration; carbon fixation; low temperature; polar waters; Antarctica; water temperature
It is well established that Antarctic phytoplankton and sea-ice algae are able to thrive at low temperatures and it has been proposed that a reduction in respiration may be important in enabling them to do this. This possibility was studied in an Antarctic clone of a small unicellular
species isolated from the Weddell Sea (Antarctica), using comparative measurements of C assimilation during long- and short-term incubation series over a range of temperatures (-1.5 to 4 °C) at two irradiances (5 and 55 µmol m?²/s). Even though doubling times varied considerably, the total amount of C assimilated per cell per generation time was similar at each of the temperature and light conditions. However, over one cell cycle, significant respiratory C losses were determined by divergences in C assimilation patterns between cumulative and long-term incubations at both light intensities at 0 and 4 °C. At -1.5 °C, insignificant C losses were recorded. No significant extracellular release of dissolved organic material (DOC) was observed.
Elsevier Science B.V.
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refbase @ admin @ Thomas++1992
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