Document Type

Article

Department/Program

Virginia Institute of Marine Science

Publication Date

2009

Journal

Proceedings Of The Royal Society B-Biological Sciences

Volume

276

Issue

1654

First Page

81

Last Page

90

Abstract

The colony-forming haptophyte Phaeocystis antarctica is an important primary producer in the Ross Sea, and must survive long periods of darkness and freezing temperature in this extreme environment. We conducted experiments on the responses of P. antarctica-dominated phytoplankton assemblages to prolonged periods of darkness and freezing. Chlorophyll and photosynthetic capacity of the alga declined nonlinearly and independently of each other in the dark, and darkness alone would potentially reduce photosynthetic capacity by only 60 per cent over 150 days (approximately 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. Phaeocystis antarctica also survived freezing, although longer freezing durations lengthened the lag before growth resumption. Particulate dimethylsulfoniopropionate 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 the water column, and help explain its repeated dominance in austral spring blooms in the Ross Sea and elsewhere in the Southern Ocean.

DOI

10.1098/rspb.2008.0598

Keywords

Ice Microbial Communities; Phytoplankton Assemblage Composition; Southern Ross Sea; Primary Productivity; Weddell-Sea; Pack Ice; Biomass; Diatom; Nutrients; Algae

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