Biomarkers in the stratified water column of the Landsort Deep (Baltic Sea)

摘要: Abstract. The water column of the Landsort Deep, central Baltic Sea, is stratified into an oxic, suboxic, and anoxic zone. This stratification controls distributions individual microbial communities biogeochemical processes. In summer 2011, particulate organic matter was filtered from these zones using in situ pump. Lipid biomarkers were extracted filters to establish water-column profiles hydrocarbons, alcohols, phospholipid fatty acids, bacteriohopanepolyols (BHPs). As a reference, cyanobacterial bloom sampled 2012 Sea Gotland Deep analyzed for BHPs. biomarker data surface layer oxic zone showed major inputs cyanobacteria, dinoflagellates, ciliates, while underlying cold winter characterized by low diversity abundance organisms, with copepods as group. suboxic supported bacterivorous type I aerobic methanotrophic bacteria, sulfate-reducing and, most likely, methanogenic archaea. zone, sulfate reducers archaea dominating microorganisms indicated presence distinctive branched acids: archaeol pentamethylicosane (PMI) derivatives, respectively. Our study thus provided integrated insight distribution relevant compounds describes useful tracers reconstruct columns geological record.