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METHANOTROPHIC ABILITY OF MOSSES AND LICHENS ASSOCIATED BACTERIA IN PERMAFROST ECOSYSTEMS OF EASTERN SIBERIA
Abstract
Methanotrophic bacteria are unique group of microorganisms structurally and functionally adapted to use methane as a source of carbon, which is of great interest due to their ability to oxidize atmospheric methane. Methanotrophs are known to associate with mosses, which provide bacteria by habitat and protection. Methanotrophic bacteria provide mosses with carbon dioxide resulting of methane oxidation, whose content in moss tissues can reach 32%. We studied mosses and lichens sampled in Eastern Siberia permafrost ecosystems for methane oxidizing ability of associated bacteria, at concentrations of methane close to atmospheric. The consumption of methane in consortia of mosses and lichens and associated microorganisms was measured in laboratory incubation experiments. The methanotrophic activity registrated using gas analyzer Picarro 2201-i (Picarro Inc., USA) as a shift in the isotopic composition ?13? in methane. It was shown that samples collected in permafrost soils have a larger ability to methanotrophy than sample collected in non-permafrost soils. In addition, we measured methanotrophic ability of the individual species of mosses and lichens. It has been shown that methanotrophs associated with lichens ?ladonia stelaris and ?etraria laevigata have great methanotrophic ability on a level of methanotrophs associated with mosses Rhytidium rugosum and Dicranum polysetum.
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