Temporal dynamics of active Archaea in oxygen‐depleted zones of two deep lakes. Issue 2 (23rd January 2015)

• Record Type: Journal Article
• Authors: Hugoni, Mylène; Domaizon, Isabelle; Taib, Najwa; Biderre‐Petit, Corinne; Agogué, Hélène; Galand, Pierre E.; Debroas, Didier; Mary, Isabelle
• Is Part Of: Environmental microbiology reports. Volume 7:Issue 2(2015)
• Page Start: 321
• Page End: 329
• Publication Date: 2015-01-23
• Subjects: Microbial ecology -- Periodicals; Environmental Microbiology -- Periodicals; Electronic journals; 579.17
• DOI: 10.1111/1758-2229.12251
• Languages: English
• ISSNs: 1758-2229

Abstract

<abstract abstract-type="main"> <title>Summary</title> <p>Deep lakes are of specific interest in the study of archaeal assemblages as chemical stratification in the water column allows niche differentiation and distinct community structure. Active archaeal community and potential nitrifiers were investigated monthly over 1 year by pyrosequencing 16S rRNA transcripts and genes, and by quantification of archaeal <italic>amoA</italic> genes in two deep lakes. Our results showed that the active archaeal community patterns of spatial and temporal distribution were different between these lakes. The meromictic lake characterized by a stable redox gradient but variability in nutrient concentrations exhibited large temporal rearrangements of the dominant euryarchaeal phylotypes, suggesting a variety of ecological niches and dynamic archaeal communities in the hypolimnion of this lake. Conversely, <italic>T</italic><italic>haumarchaeota</italic> Marine Group I (MGI) largely dominated in the second lake where deeper water layers exhibited only short periods of complete anoxia and constant low ammonia concentrations. Investigations conducted on archaeal <italic>amoA</italic> transcripts abundance suggested that not all lacustrine <italic>T</italic><italic>haumarchaeota</italic> conduct the process of nitrification. A high number of 16S rRNA transcripts associated to crenarchaeal group C3 or the Miscellaneous Euryarchaeotic Group indicates the potential for these uncharacterized groups to contribute to nutrient cycling in lakes.</p> </abstract>