Where on Earth would one expect to find a single species of microbes (a pure culture) for sustained periods of time? Symbioses (mutualistic or parasitic) do not count, neither do Petri dishes.
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In an extreme environment. The lowest number of species we ever got down to (using DNA technologies, not culture-based methods) was about 10 (from an extremely alkaline Mongolian salt lake which froze in the winter and almost boiled in the summer.
Posted by: AJ Cann | March 22, 2007 at 09:32 AM