COMPETITION BETWEEN ANOXYGENIC PHOTOTROPHIC BACTERIA AND COLORLESS SULFUR BACTERIA IN A MICROBIAL MATVISSCHER, PT., VANDENENDE, FP., SCHAUB, BEM. & VANGEMERDEN, H., Jun-1992, In : FEMS Microbial Ecology. 101, 1, p. 51-58 8 p.
Research output: Contribution to journal › Article › Academic › peer-review
The populations of chemolithoautotrophic (colorless) sulfur bacteria and anoxygenic phototrophic bacteria were enumerated in a marine microbial mat. The highest population densities were found in the 0-5 mm layer of the mat: 2.0 X 10(9) cells CM-3 sediment, and 4.0 X 10(7) cells cm-3 sediment for the colorless sulfur bacteria and phototrophs, respectively. Kinetic parameters for thiosulfate-limited growth were assessed for Thiobacillus thioparus T5 and Thiocapsa roseopersicina Ml, both isolated from microbial mats. For Thiobacillus T5, growing at a constant oxygen concentration of 43-mu-mol l-1, mu(max) was 0.336 h-1 and K(s) 0.8-mu-mol l-1. Phototrophically grown Thiocapsa strain Ml displayed a mu(max) of 0.080 h-1 and a K(s) of 8-mu-mol 1-1 when anoxically grown under thiosulfate limitation. In a competition experiment with thiosulfate as electron donor, Thiocapsa became dominant during a 10-h oxic/14-h anoxic regimen at continuous illumination, despite the higher affinity for thiosulfate of Thiobacillus.
|Number of pages||8|
|Journal||FEMS Microbial Ecology|
|Publication status||Published - Jun-1992|
- THIOCAPSA, THIOBACILLUS, COMPETITION, CONTINUOUS CULTURE, MICROBIAL MAT, OXIC ANOXIC REGIMENS, THIOCAPSA-ROSEOPERSICINA, CHROMATIUM-VINOSUM, GROWTH, OXIDATION, SULFIDE, LIGHT, DARK