Cyanobacterial ecotypes in different optical microenvironments of a 68 degrees C hot spring mat community revealed by 16S-23S rRNA internal transcribed spacer region variation.

Abstract excerpt

We examined the population of unicellular cyanobacteria (Synechococcus) in the upper 3-mm vertical interval of a 68 degrees C region of a microbial mat in a hot spring effluent channel (Yellowstone National Park, Wyoming). Fluorescence microscopy and microsensor measurements of O(2) and oxygenic photosynthesis demonstrated the existence of physiologically distinct Synechococcus populations at different depths...

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