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Related Experiment Videos

Community structure and function in prokaryotic marine plankton.

Jed A Fuhrman1

  • 1Department of Biological Sciences, University of Southern California, Los Angeles 90089-0371, USA. fuhrman@usc.edu

Antonie Van Leeuwenhoek
|November 27, 2002
PubMed
Summary

Molecular biodiversity studies reveal new marine microbes and their functions. Combining techniques like STARFISH helps link microbial phylogeny to their roles in nutrient cycling.

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Area of Science:

  • Microbial Ecology
  • Marine Biology
  • Molecular Biodiversity

Background:

  • Molecular biodiversity studies have identified numerous novel marine microorganisms.
  • Traditional methods like cloning and fingerprinting reveal community composition but not function.
  • Linking microbial phylogeny to ecological function remains a significant challenge.

Purpose of the Study:

  • To investigate the ecological roles of uncultivated marine microorganisms.
  • To develop and apply methods for linking microbial phylogeny with in situ activity.
  • To understand the functional contributions of diverse microbial groups in marine ecosystems.

Main Methods:

  • Fluorescence in situ hybridization combined with microautoradiography (FISH-MAR), termed STARFISH.
  • Phylogenetic analysis of microbial communities.
  • Assessment of nutrient uptake by deep-sea archaea.

Main Results:

  • STARFISH successfully linked phylogenetic identity with metabolic activity in marine microbial communities.
  • Ubiquitous deep-sea archaea, related to thermophiles, were found to actively consume amino acids at nanomolar concentrations.
  • These archaea appear to be heterotrophic and capable of competing with bacteria for nutrients.

Conclusions:

  • Phylogenetic information alone is insufficient to predict microbial function.
  • Integrated techniques like STARFISH are crucial for understanding the activity of uncultivated microbes.
  • Deep-sea archaea play a significant role in marine nutrient cycling, challenging previous assumptions.

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