P566 BIOGEOCHEMICAL CYCLE OF METHANE IN REGIONS OF MARINE AND FRESHWATER METHANE VENTS B.B. NAMSARAEV and O.P. DAGUROVA Institute of General and Experimental Biology SB RAS Sakhyanovoi 6 670047 Ulan-Ude Russia 1 Introduction The gasohydrotherms with numerous gas infiltrations were found in the regions of volcanic activity in marine and freshwater ecosystems [1-4]. The main component of gases is methane. There are two pathways of methane appearance in the water reservoirs. The first is the process of the bacterial methane generation on the terminal stage of the anaerobic destruction of the organic matter. The second pathway is the methane entrance


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