Why we do it
Classically, dissolved organic matter (DOM) in sediment pore waters was assumed to be not available for microbial communities to consume. This assumption was based on the fact that DOM is accumulating with sediment depth, and the consumption rates within the sediments should be smaller than production rates of DOM. However, recently it was suggested that sediment pore waters might potentially serve a source of bioavailable DOM to the overlying near bottom water layer and water column. It was also hypothesised that DOM supplied by sediments might stimulate microbial growth and activity in the near-bottom waters.