Abstract
Ciliated protozoa are the principal component of the rumen microbiota. They contribute significantly the digestion of ruminants. As anaerobic fermentative microorganisms, rumen ciliated protozoa produce a significant amount of hydrogen and formate. Methanogenic archaea therefore associate closely with rumen ciliated protozoa. The presence of episymbiotic methanogens in rumen ciliated protozoa has been demonstrated as early as 1980s by microscopy. The number of ciliate-associated methanogens increases from the 100 level to 104/cell of ciliates after feeding. Enhancement of hydrogen and/or formate production from the ciliates by feeding attracts free-living methanogens. There are a couple of studies about the phylogeny of the ciliate-associated methanogens based on a molecular ecological approach. A range of methanogenic archaeal 16S rDNA, representing Methanobacteriales, Methanomicrobiales and Methanosarcinales, have been detected as ciliate-associated methanogens. However, it is still difficult to draw a conclusion about a potentially specific interaction between a particular ciliate species and a species of methanogenic archaea from these limited studies.
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Ushida, K. (2018). Symbiotic Methanogens and Rumen Ciliates. In: Hackstein, J. (eds) (Endo)symbiotic Methanogenic Archaea. Microbiology Monographs, vol 19. Springer, Cham. https://doi.org/10.1007/978-3-319-98836-8_3
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DOI: https://doi.org/10.1007/978-3-319-98836-8_3
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