Biomass and production in polar planktonic and sea ice microbial communities: a comparative study |
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| Authors: | R B Rivkin M Putt S P Alexander D Meritt L Gaudet |
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| Institution: | (1) Horn Point Environmental Laboratories, University of Maryland, 21613 Cambridge, Maryland, USA;(2) Department of Biological Sciences, University of California, 93106 Santa Barbara, California, USA;(3) A-002, Marine Biology Research Division, Scripps Institution of Oceanography, University of California, 92093 La Jolla, California, USA;(4) Present address: Department of Biology, Woods Hole Oceanographic Institution, 20543 Woods Hole, Massachusetts, USA;(5) Present address: Wadsworth Center for Laboratories and Research, Empire State Plaza, 12201 Albany, New York, USA |
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| Abstract: | Algal and bacterial biomass and production were measured in the plankton, platelet ice and congelation ice communities at one station in McMurdo Sound, Antarctica during September and October 1986. Bacterial abundances and particulate organic carbon and nitrogen were 10 to 100 times greater in the plankton than in the sea ice, whereas the chlorophyll a concentrations in the plankton and sea ice microbial communities (SIMCO) were similar Rates of both light-limited and light-saturated photosynthesis and daily primary production were 2 to 6 times greater in the plankton than in the SIMCO. Bacterial growth rates ranges from 0.7 to 1.5 d-1 in all three communities; however, because of the greater bacterial biomass in the plankton, bacterial production was 15 to 20 times higher there than in the SIMCO. These results suggest that during the early austral spring, planktonic production contributes significantly to total production in ice-covered environments. |
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