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Proc Calif Acad Sci. 2005 Jun 3;56(6 Suppl 1):62-71.

Species Numbers in Bacteria.

Author information

1
Department of Ecology and Evolution, Stony Brook University, Life Sciences Building, Stony Brook, NY 11794-5245.

Abstract

A modified biological species definition (BSD), i.e., that bacteria exchange genes within a species, but not usually between species, is shown to apply to bacteria. The formal definition of bacterial species, which is more conservative than the modified BSD, is framed in terms of DNA hybridization. From this I estimate there are a million species of bacteria in 30 grams of rich forest topsoil and propose that there will be at least a billion species worldwide.

PMID:
21874075
PMCID:
PMC3160642

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