Exploring the mechanisms by which reindeer droppings induce fen peat methane production
Fritze, Hannu; Penttilä, Timo; Mäkiranta, Päivi; Laiho, Raija; Tuomivirta, Tero; Forsman, Jukka; Kumpula, Jouko; Juottonen, Heli; Peltoniemi, Krista (2021)
Fritze, Hannu
Penttilä, Timo
Mäkiranta, Päivi
Laiho, Raija
Tuomivirta, Tero
Forsman, Jukka
Kumpula, Jouko
Juottonen, Heli
Peltoniemi, Krista
Julkaisusarja
Soil Biology and Biochemistry
Volyymi
160
Elsevier
2021
Julkaisun pysyvä osoite on
http://urn.fi/URN:NBN:fi-fe2021061036481
http://urn.fi/URN:NBN:fi-fe2021061036481
Tiivistelmä
Peatlands, especially fens, are known to emit methane. Reindeer (Rangifer tarandus) use mires mainly as spring and summer pastures. In this work we observed that adding reindeer droppings to fen peat increased the potential methane production by 40%. This became apparent when droppings originating from reindeer kept in pen or pasture in winter were added to methanogenic fen peat samples. The droppings introduced Methanobacteriaceae (Methanobrevibacter; > 90% of the mcrA MiSeq reads) to the peat, which was originally populated by Methanosarcinaceae, Methanosaetaceae, Methanoregulaceae, Methanobacteriaceae, Methanomassiliicoccaceae, Methanocellaceae and Methanomicrobiaceae. The original community structure did not explain the induced methane production and neither did the origin of the droppings. Instead, the increment in methane production was explained by the increased methanogenic abundance, measured by mcrA qPCR, due to the addition of droppings. The result confirms that methanogens from the reindeer rumen participate in peat methane production. This finding suggests that reindeer grazing may increase methane emissions in northern fens.
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