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Bacterial Influence on the Variability in the Ocean’s Biogeochemical State: A Mechanistic View

  • F. Azam
  • D. C. Smith
Part of the NATO ASI Series book series (volume 27)

Abstract

Traditionally, the only component of the microbial communities studied seriously by biological oceanographers was phytoplankton. Bacteria, protozoa, viruses and fungi were relegated to “specialists” and it was implicitly assumed that, by and large, the ocean’s productivity mechanisms and biogeochemical dynamics could be understood and modelled without taking into account the activities of these other components of the pelagic microbiota. This view was challenged by the seminal paper of Pomeroy (1974) and by quantitative studies inspired by it, leading up to the discovery that the pathway DOM -- > bacteria -- > protozoa -- > metazoa (microbial loop; Azam et al., 1983) is a major route for the flows of material and energy in pelagic marine ecosystems. Further, very recently it has been suggested that viruses may also play important ecological roles (Bergh et al., 1989; Proctor and Fuhrman, 1990; Suttle et al., 1990), including a role in the mortality of bacteria and phytoplankton.

Keywords

Euphotic Zone Phytoplankton Cell Attached Bacterium Carbon Demand Dissolve Free Amino Acid 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1991

Authors and Affiliations

  • F. Azam
    • 1
  • D. C. Smith
    • 1
  1. 1.Marine Biology Research Division Scripps Institution of OceanographyUniversity of California, San DiegoLa JollaUSA

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