NDLI: Temporal Dynamics of Active Prokaryotic Nitrifiers and Archaeal Communities from River to Sea

Content Provider	Springer Nature Link
Author	Hugoni, Mylène Agogué, Hélène Taib, Najwa Domaizon, Isabelle Moné, Anne Galand, Pierre E. Bronner, Gisèle Debroas, Didier Mary, Isabelle
Copyright Year	2015
Abstract	To test if different niches for potential nitrifiers exist in estuarine systems, we assessed by pyrosequencing the diversity of archaeal gene transcript markers for taxonomy (16S ribosomal RNA (rRNA)) during an entire year along a salinity gradient in surface waters of the Charente estuary (Atlantic coast, France). We further investigated the potential for estuarine prokaryotes to oxidize ammonia and hydrolyze urea by quantifying thaumarchaeal amoA and ureC and bacterial amoA transcripts. Our results showed a succession of different nitrifiers from river to sea with bacterial amoA transcripts dominating in the freshwater station while archaeal transcripts were predominant in the marine station. The 16S rRNA sequence analysis revealed that Thaumarchaeota marine group I (MGI) were the most abundant overall but other archaeal groups like Methanosaeta were also potentially active in winter (December–March) and Euryarchaeota marine group II (MGII) were dominant in seawater in summer (April–August). Each station also contained different Thaumarchaeota MGI phylogenetic clusters, and the clusters’ microdiversity was associated to specific environmental conditions suggesting the presence of ecotypes adapted to distinct ecological niches. The amoA and ureC transcript dynamics further indicated that some of the Thaumarchaeota MGI subclusters were involved in ammonia oxidation through the hydrolysis of urea. Our findings show that ammonia-oxidizing Archaea and Bacteria were adapted to contrasted conditions and that the Thaumarchaeota MGI diversity probably corresponds to distinct metabolisms or life strategies.
Starting Page	473
Ending Page	483
Page Count	11
File Format	PDF
ISSN	00953628
Journal	Microbial Ecology
Volume Number	70
Issue Number	2
e-ISSN	1432184X
Language	English
Publisher	Springer US
Publisher Date	2015-04-08
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Ammonia oxidation amoA Archaea Gradient Diversity Microbiology Ecology Microbial Ecology Geoecology/Natural Processes Nature Conservation Water Quality/Water Pollution
Content Type	Text
Resource Type	Article
Subject	Soil Science Ecology Ecology, Evolution, Behavior and Systematics

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