The microbial species data originally appeared in Acinas et al 2004. Recently it was re-analyzed by Bohning and Schon 2005, and Wang 2009.
Acinas, S., Klepac-Ceraj, V., Hunt, D., Pharino, C., Ceraj, I., Distel, D., and Polz, M. (2004), Fine-scale phylogenetic architecture of a complex bacterial community. Nature, 430, 551-554.
Hong, S. H., and Bunge, J. and Jeon, S.O. and Epstein, S. (2006), Predicting microbial species richness, Proc. Natl. Acad. Sci, 103, 117-122.
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