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My research focus on marine bacteria and their influence on the environmental status in the Sea. I am also director for Umeå Marine Sciences Center.
Role of bacterioplankton respiration in marine oxygen consumption and CO2-emission
Oxygen deficiency of coastal waters and increased emissions of carbon dioxide to the atmosphere constitute major environmental concerns for the biosphere today. Bacterioplankton respiration of organic matter accounts for more than 50 percent of the flow of carbon and oxygen in aquatic environments. Therefore improved understanding of the regulation of bacterial respiration is necessary to promote development of adequate models the marine carbon and oxygen cycles. These constitutes the basis for management of oxygen depleted bottom waters and assessments of the human impact on the CO2 -level in the atmosphere.
The project addresses the following questions:
Work includes both field studies onboard research vessels at sea and experimental work in the laboratory, primarily at Umeå Marine Sciences Centre. Methodology includes current techniques to measure bacterioplankton abundance by image analysis, cryo-electronmicroscopy, DNA sequencing and bioinformatics, growth in situ by thymidine incorporation, analysis of mRNA transcripts, oxygen consumption by Optodes and CO2 emission. Chemostats constitute experimental system for some investigations. Evaluation tools include the marine database (SQL language) at UMF and the statistical software SPSS.