Community Size and Metabolic Rates of Psychrophilic Sulfate-Reducing Bacteria in Arctic Marine Sediments

作者：Christian Knoblauch, Bo Barker Jørgensen, Jens Harder · 发表于：Applied and Environmental Microbiology · 年份：1999 · DOI：10.1128/aem.65.9.4230-4233.1999 · 被引用次数：137 · 研究领域：Marine Bivalve and Aquaculture Studies、Microbial Community Ecology and Physiology、Marine Biology and Ecology Research

The numbers of sulfate reducers in two Arctic sediments with in situ temperatures of 2.6 and -1.7 degrees C were determined. Most-probable-number counts were higher at 10 degrees C than at 20 degrees C, indicating the predominance of a psychrophilic community. Mean specific sulfate reduction rates of 19 isolated psychrophiles were compared to corresponding rates of 9 marine, mesophilic sulfate-reducing bacteria. The results indicate that, as a physiological adaptation to the permanently cold Arctic environment, psychrophilic sulfate reducers have considerably higher specific metabolic rates than their mesophilic counterparts at similarly low temperatures.