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Title: Freshwater carbon and nutrient cycles revealed through reconstructed population genomes

Journal Article · · PeerJ
DOI:https://doi.org/10.7717/peerj.6075· OSTI ID:1510750

Although microbes mediate much of the biogeochemical cycling in freshwater, the categories of carbon and nutrients currently used in models of freshwater biogeochemical cycling are too broad to be relevant on a microbial scale. One way to improve these models is to incorporate microbial data. Here, we analyze both genes and genomes from three metagenomic time series and propose specific roles for microbial taxa in freshwater biogeochemical cycles. Our metagenomic time series span multiple years and originate from a eutrophic lake (Lake Mendota) and a humic lake (Trout Bog Lake) with contrasting water chemistry. Our analysis highlights the role of polyamines in the nitrogen cycle, the diversity of diazotrophs between lake types, the balance of assimilatory vs. dissimilatory sulfate reduction in freshwater, the various associations between types of phototrophy and carbon fixation, and the density and diversity of glycoside hydrolases in freshwater microbes. We also investigated aspects of central metabolism such as hydrogen metabolism, oxidative phosphorylation, methylotrophy, and sugar degradation. Finally, by analyzing the dynamics over time in nitrogen fixation genes and Cyanobacteria genomes, we show that the potential for nitrogen fixation is linked to specific populations in Lake Mendota. This work represents an important step towards incorporating microbial data into ecosystem models and provides a better understanding of how microbes may participate in freshwater biogeochemical cycling.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1510750
Journal Information:
PeerJ, Vol. 6, Issue 12; ISSN 2167-8359
Publisher:
PeerJ Inc.Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 39 works
Citation information provided by
Web of Science

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Linking metagenomics to aquatic microbial ecology and biogeochemical cycles journal January 2020
Expansion of known ssRNA phage genomes: From tens to over a thousand journal February 2020
Think global, act local: The small-scale environment mainly influences microbial community development and function in lake sediment text January 2020
Ecosystem-wide metagenomic binning enables prediction of ecological niches from genomes journal March 2020
Large Freshwater Phages with the Potential to Augment Aerobic Methane Oxidation conference January 2020