A comparison of different extraction methods with respect to bacteriohopanepolyols (BHPs) is discussed in Chapter 2 (“Test of microwave, ultrasound and Bligh & Dyer extraction for quantitative extraction of bacteriohopanepolyols (BHPs) from marine sediments”). All methods are applicable for the extraction of BHPs and microwave extraction was the method preferentially used in the following chapters. [Own contribution: First author; reprocessing of samples, measurements, interpretation, discussion, writing.]
In chapter 3, the general distribution of biomarkers in the stratified central Baltic Sea water column was analyzed with samples collected in the Landsort Deep (“Biomarkers in the stratified water column of the Landsort Deep (Baltic Sea)”).
[Own contribution: First author; reprocessing of samples, measurements, interpretation, discussion, writing.]
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First results on aerobic methanotrophy in the Baltic Sea Gotland Deep are presented in Chapter 4 (“Aerobic methanotrophy within the pelagic redox-zone of the Gotland Deep (central Baltic Sea)”). Interdisciplinary methods performed on water samples collected in summer 2008 gave information about the amount of methane consumed and the bacteria involved in the suboxic zone. [Own contribution: Co-Author; partial reprocessing of samples, contribution to interpretation, discussion, writing.]
In Chapter 5 (“Biomarkers for aerobic methanotrophy in the water column of the stratified Gotland Deep (Baltic Sea)”), Gotland Deep samples collected in summer 2008 were further analyzed with respect to molecular biomarkers. BHPs were of special interest. It was shown that suboxic zone BHP production controls BHP signals in the underlying surface sediment. [Own contribution: First author;
reprocessing of samples, measurements, interpretation, discussion, writing.]
The geological record of BHPs in sediments and their applicability to reconstruct water column stratification during the Baltic Sea Holocene history is discussed in chapter 6 (“Bacteriohopanepolyols record stratification, nitrogen fixation and other biogeochemical perturbations in Holocene sediments of the central Baltic Sea”).
[Own contribution: Co-Author; partial reprocessing of samples, BHP measurements, contribution to writing.]
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