This Grant covers funding for a 1-year extension of the PhD project “Microbial methane consumption in contrasting ocean environments: effects of elevated seepage and geochemical boundary conditions” (SNF DACH Project 200021L_138057. Apr. 2012 - Mar. 2015). The initial aims of the project were to investigate (i) the marine CH4 filter in view of elevated CH4 fluxes in the future and (ii) to asses the scope for water column CH4 oxidation regarding magnitude, identity of key organisms and controlling environmental factors. The grant allows to conduct additional analyses of samples that were collected during the first two years of the project to complement the already exiting data sets.