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Sea ice microbial communities (SIMCO)

9. Effects of temperature and salinity on rates of metabolism and growth of autotrophs and heterotrophs

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Summary

Sea ice microbial communities (SIMCO) grow luxuriantly within several microhabitats of sea ice, indicating that the microorganisms comprising these communities are well adapted to the physicochemical gradients which characterize sea ice. We used SIMCO obtained from the bottom of congelation ice in McMurdo Sound, Antarctica, to test the hypothesis that low temperature limits microbial productivity in polar oceans and also to investigate the effect of salinity on rates of autotrophic and heterotrophic metablism. Substantial rates of carbon fixation, incorporation of thymidine, and uptake of glutamate occurred at the in situ temperatures of-1.9°C, with maximum rates at temperatures considerably warmer but below 15°C. Microalgae and bacteria of SIMCO are thus indicated to be psychrophiles. The relative rates of autotrophic and heterotrophic microbial growth (based on rates of fixation of 14CO2 by microalgae and incorporation of 3H-thymidine by bacteria, respectively) were similar and overlapped from 4° and 7°C. These data suggest that a recent hypothesis proposing the uncoupling of primary production and bacterial production in cold water, due to differential growth of phytoplankton and bacterioplankton at low temperatures, is refuted with respect to SIMCO. Maximum rates of carbon fixation by autotrophs of SIMCO occurred at salinities which characterized the ice from which the SIMCO were collected. In contrast, heterotrophs of SIMCO exhibited a more stenohaline response to variable salinity, with maximum incorporation of thymidine and uridine from 20‰ to 30‰. Adaptations by autotrophs and heterotrophs of SIMCO that permit substantial metabolism and growth at very low temperatures and variable salinities are significant when considering production and trophodynamics in polar oceans. Actively growing microorganisms in these unique communities contribute to overall production in polar oceans, provide carbon for food webs associated with sea ice, and upon release from melting ice may contribute to microbial blooms in marginal ice edge zones, which in turn support cryopelagic food webs.

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  1. Marinc Biology Research Section, Department of Biological Sciences, University of Southern California, 90089-0371, Los Angeles, CA, USA

    Steven T. Kottmeier & Cornelius W. Sullivan

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  1. Steven T. Kottmeier
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  2. Cornelius W. Sullivan
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Kottmeier, S.T., Sullivan, C.W. Sea ice microbial communities (SIMCO). Polar Biol 8, 293–304 (1988). https://doi.org/10.1007/BF00263178

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