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Estimating prokaryotic diversity and its limits.

Thomas P Curtis1, William T Sloan, Jack W Scannell

  • 1Department of Civil Engineering, Centre for Molecular Ecology, University of Newcastle upon Tyne, Newcastle upon Tyne NE1 7RU, United Kingdom. tom.curtis@ncl.ac.uk

Proceedings of the National Academy of Sciences of the United States of America
|July 5, 2002
PubMed
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Estimating prokaryotic diversity is possible by analyzing species abundance curves. This method relates total individuals to the most abundant species, offering new insights into bacterial communities.

Area of Science:

  • Microbiology
  • Ecology
  • Bioinformatics

Background:

  • Prokaryotic diversity is considered unknown and unknowable.
  • Estimating taxa requires more than counting every species.
  • Species abundance curves can estimate diversity.

Purpose of the Study:

  • To propose a method for estimating prokaryotic diversity.
  • To relate diversity to measurable variables.
  • To estimate prokaryotic diversity at various scales.

Main Methods:

  • Utilizing log-normal species abundance curves.
  • Calculating the ratio of total individuals to the most abundant species.
  • Applying Preston's canonical hypothesis or assuming a minimum abundance of 1.

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Main Results:

  • Prokaryotic diversity can be estimated using species abundance curves.
  • Estimated diversity: oceans (160/ml), soil (6,400-38,000/g), sewage (70/ml).
  • Speculated diversity: sea (2 x 10^6), soil (4 x 10^6/ton).

Conclusions:

  • Prokaryotic diversity is quantifiable using species abundance curves.
  • Experimental counting is less effective than abundance curve analysis.
  • This approach provides preliminary estimates for local and global prokaryotic diversity.