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Survival and Recovery of Phaeocystis Antarctica (Prymnesiophyceae) from Prolonged Darkness and Freezing
Tang, K. W., W. O. Smith, D. T. Elliott, AND A. SHIELDS. Survival and Recovery of Phaeocystis Antarctica (Prymnesiophyceae) from Prolonged Darkness and Freezing. Proceedings of the Royal Society B. Royal Society Publishing, London, Uk, 276(1654):81-90, (2009).
To observe the outcome of conducted experiments on the responses of P. antarctica-dominated phytoplankton assemblages to prolonged periods of darkness and to freezing.
The colony-forming haptophyte Phaeocystis antarctica is an important primary producer in the Ross Sea, and must survive long periods of darkness and freezing in this extreme environment. We conducted experiments on the responses of P. antarctica-dominated phytoplankton assemblages to prolonged periods of darkness and to freezing. Chlorophyll and photosynthetic capacity of the alga declined non-linearly and independently of each other in the dark, and darkness alone would potentially reduce photosynthetic capacity by only 60% over 150 days (the length of the Antarctic winter in the southern Ross Sea). The estimated reduction of colonial mucous carbon is higher than that of colonial cell carbon, suggesting metabolism of the colonial matrix in the dark. The alga quickly resumed growth upon return to light. P. antarctica also survived freezing, although longer freezing durations lengthened the lag before active growth. Particulate DMSP relative to chlorophyll increased upon freezing and decreased upon darkness. Taken together, the abilities of P. antarctica to survive freezing and initiate growth quickly after darkness may provide it with the capability to survive in both the ice and water column, and help explain its repeated dominance in the austral spring blooms in the Ross Sea and elsewhere in the Southern Ocean.
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SURVIVAL AND RECOVERY OF PHAEOCYSTIS ANTARCTICA (PRYMNESIOPHYCEAE) FROM PROLONGED DARKNESS AND FREEZING (ABSTRACT) (PDF,NA pp, 70 KB, about PDF)