| competition for sulfide among colorless and purple sulfur bacteria in cyanobacterial mats. | the vertical zonation of light, o2, h2s, ph, and sulfur bacteria was studied in two benthic cyanobacterial mats from hypersaline ponds at guerrero negro, baja california, mexico. the physical-chemical gradients were analyzed in the upper few mm at < or = 100 micrometers spatial resolution by microelectrodes and by a fiber optic microprobe. in mats, where oxygen produced by photosynthesis diffused far below the depth of the photic zone, colorless sulfur bacteria (beggiatoa sp.) were the dominan ... | 1986 | 11542103 |