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Appl. Environ. Microbiol., Mar 1996, 1045-1050, Vol 62, No. 3
Copyright © 1996, American Society for Microbiology

Enrichment Culture and Microscopy Conceal Diverse Thermophilic Synechococcus Populations in a Single Hot Spring Microbial Mat Habitat

MJ Ferris, AL Ruff-Roberts, ED Kopczynski, MM Bateson and DM Ward
Department of Microbiology, Montana State University, Bozeman, Montana 59717

Recent molecular studies have shown a great disparity between naturally occurring and cultivated microorganisms. We investigated the basis for disparity by studying thermophilic unicellular cyanobacteria whose morphologic simplicity suggested that a single cosmopolitan species exists in hot spring microbial mats worldwide. We found that partial 16S rRNA sequences for all thermophilic Synechococcus culture collection strains from diverse habitats are identical. Through oligonucleotide probe analysis and cultivation, we provide evidence that this species is strongly selected for in laboratory culture to the exclusion of many more-predominant cyanobacterial species coexisting in the Octopus Spring mat in Yellowstone National Park. The phylogenetic diversity among Octopus Spring cyanobacteria is of similar magnitude to that exhibited by all cyanobacteria so far investigated. We obtained axenic isolates of two predominant cyanobacterial species by diluting inocula prior to enrichment. One isolate has a 16S rRNA sequence we have not yet detected by cloning. The other has a 16S rRNA sequence identical to a new cloned sequence we report herein. This is the first cultivated species whose 16S rRNA sequence has been detected in this mat system by cloning. We infer that biodiversity within this community is linked to guild structure.


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