Abstract：
:To investigate whether there is a nexus between the microbial diversity level (taxonomic, functional and ecological) and the stress tolerance potential of the microbial community, the impact of different ammonium sources was evaluated. Therefore reactors adapted either to the anaerobic digestions of sugar beet silage or maize silage (SBS/MS) were supplemented with animal manure (M) or ammonium carbonate (A). The results showed that increasing concentrations of total ammonium nitrogen (TAN) were not the only reason for community changes: the bacterial community in the reactors given animal manure became more similar over time compared to the reactors given ammonium carbonate. However, this study revealed that a bacterial community with a few dominant members led to a functional more flexible archaeal community (SBS reactors) which was more stress resistant under the experimental conditions. This indicates that a higher functional diversity within a certain part of the community, in the present study the archaeal community, is one important factor for process stability due to a higher tolerance to increasing amounts of process-inhibiting metabolites such as TAN. Compared to this a bacterial community with higher amount of more evenly distributed community members combined with a more rigid archaeal community (MS reactors) showed a lower stress tolerance potential. Moreover it was observed that the disappearance of members of the phylum Cloacimonetes can be used as an indicator for an upcoming process disturbance due to increasing TAN concentrations.
journal_name
Anaerobejournal_title
Anaerobeauthors
Klang J,Szewzyk U,Bock D,Theuerl Sdoi
10.1016/j.anaerobe.2019.01.003subject
Has Abstractpub_date
2019-04-01 00:00:00pages
8-16eissn
1075-9964issn
1095-8274pii
S1075-9964(19)30003-4journal_volume
56pub_type
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