| one publication added to basket [16112] | Abundance and salt tolerance of obligately aerobic, phototrophic bacteria in a marine microbial mat
Yurkov, V.V.; van Gemerden, H. (1993). Abundance and salt tolerance of obligately aerobic, phototrophic bacteria in a marine microbial mat. Neth. J. Sea Res. 31(1): 57-62
In: Netherlands Journal of Sea Research. Netherlands Institute for Sea Research (NIOZ): Groningen; Den Burg. ISSN 0077-7579; e-ISSN 1873-1406, more
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| Authors | | Top |
- Yurkov, V.V.
- van Gemerden, H.
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| Abstract |
Data have been collected on the abundance of obligately aerobic,bacteriochlorophyll-a-containing bacteria in a marine microbial mat on the West Frisian Island of Texel, the Netherlands. Plate counts on media rich in organic matter revealed average numbers of 3*105·cm-3 sediment in the top 10 mm of the mat; the number of purple non-sulphur bacteria was of the same magnitude. Due to the relatively small dimensions of obligately aerobic anoxygenic phototrophic bacteria and purple non-sulphur bacteria, compared to those of purple sulphur bacteria, the contributions of either of the two former groups to the biomass of Bchl-a-containing organisms was approximately 3%. The Specific Bchl-a-content of the isolated obligately aerobic phototrophs was very low (0.8 to 1.0 µg·mg-1 protein) compared to that of purple non-sulphur bacteria (16 to 20 µg·mg-1 protein), and purple sulphur bacteria (27 to 30 µg·mg-1). As a consequence, the relative contribution to the total Bchl a concentration of the two former groups (0.1% and 2.1%, respectively) was negligible, compared to that of the purple sulphur bacteria (97.8%). Salinities <50 had little effect on growth rate and yield of isolates; at salinities between 50 and 100 the doubling time increased progressively with a concomitant decrease in yield; no growth occurred at salinities >140. |
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