Metagenomic and lipid analyses reveal a diel cycle in a hypersaline microbial ecosystem
Abstract
Marine microbial communities experience daily fluctuations in light and temperature that can have important ramifications for carbon and nutrient cycling. Elucidation of such short time scale community-wide dynamics is hindered by system complexity. Hypersaline aquatic environments have lower species richness than marine environments and can be well-defined spatially, hence they provide a model system for diel cycle analysis. For this study, we conducted a 3-day time series experiment in a well-defined pool in hypersaline Lake Tyrrell, Australia. Microbial communities were tracked by combining cultivation-independent lipidomic, metagenomic and microscopy methods. The ratio of total bacterial to archaeal core lipids in the planktonic community increased by up to 58% during daylight hours and decreased by up to 32% overnight. However, total organism abundances remained relatively consistent over 3 days. Metagenomic analysis of the planktonic community composition, resolved at the genome level, showed dominance by Haloquadratum species and six uncultured members of the Halobacteriaceae. The post 0.8 μm filtrate contained six different nanohaloarchaeal types, three of which have not been identified previously, and cryo-transmission electron microscopy imaging confirmed the presence of small cells. Notably, these nano-sized archaea showed a strong diel cycle, with a pronounced increase in relative abundance over the night periods.more »
- Authors:
-
- Univ. of California, Berkeley, CA (United States)
- The Australian National Univ., Canberra, ACT (Australia)
- Univ. of Southern California, Los Angeles, CA (United States)
- Univ. of Colorado, Boulder, CO (United States); Univ. of California, Berkeley, CA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Univ. of Melbourne, Carlton, Melbourne (Australia)
- Univ. of Colorado, Denver, CO (United States)
- Univ. of California, San Diego, La Jolla, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1579834
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- The ISME Journal
- Additional Journal Information:
- Journal Volume: 9; Journal Issue: 12; Journal ID: ISSN 1751-7362
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES
Citation Formats
Andrade, Karen, Logemann, Jörn, Heidelberg, Karla B., Emerson, Joanne B., Comolli, Luis R., Hug, Laura A., Probst, Alexander J., Keillar, Angus, Thomas, Brian C., Miller, Christopher S., Allen, Eric E., Moreau, John W., Brocks, Jochen J., and Banfield, Jillian F. Metagenomic and lipid analyses reveal a diel cycle in a hypersaline microbial ecosystem. United States: N. p., 2015.
Web. doi:10.1038/ismej.2015.66.
Andrade, Karen, Logemann, Jörn, Heidelberg, Karla B., Emerson, Joanne B., Comolli, Luis R., Hug, Laura A., Probst, Alexander J., Keillar, Angus, Thomas, Brian C., Miller, Christopher S., Allen, Eric E., Moreau, John W., Brocks, Jochen J., & Banfield, Jillian F. Metagenomic and lipid analyses reveal a diel cycle in a hypersaline microbial ecosystem. United States. https://doi.org/10.1038/ismej.2015.66
Andrade, Karen, Logemann, Jörn, Heidelberg, Karla B., Emerson, Joanne B., Comolli, Luis R., Hug, Laura A., Probst, Alexander J., Keillar, Angus, Thomas, Brian C., Miller, Christopher S., Allen, Eric E., Moreau, John W., Brocks, Jochen J., and Banfield, Jillian F. Tue .
"Metagenomic and lipid analyses reveal a diel cycle in a hypersaline microbial ecosystem". United States. https://doi.org/10.1038/ismej.2015.66. https://www.osti.gov/servlets/purl/1579834.
@article{osti_1579834,
title = {Metagenomic and lipid analyses reveal a diel cycle in a hypersaline microbial ecosystem},
author = {Andrade, Karen and Logemann, Jörn and Heidelberg, Karla B. and Emerson, Joanne B. and Comolli, Luis R. and Hug, Laura A. and Probst, Alexander J. and Keillar, Angus and Thomas, Brian C. and Miller, Christopher S. and Allen, Eric E. and Moreau, John W. and Brocks, Jochen J. and Banfield, Jillian F.},
abstractNote = {Marine microbial communities experience daily fluctuations in light and temperature that can have important ramifications for carbon and nutrient cycling. Elucidation of such short time scale community-wide dynamics is hindered by system complexity. Hypersaline aquatic environments have lower species richness than marine environments and can be well-defined spatially, hence they provide a model system for diel cycle analysis. For this study, we conducted a 3-day time series experiment in a well-defined pool in hypersaline Lake Tyrrell, Australia. Microbial communities were tracked by combining cultivation-independent lipidomic, metagenomic and microscopy methods. The ratio of total bacterial to archaeal core lipids in the planktonic community increased by up to 58% during daylight hours and decreased by up to 32% overnight. However, total organism abundances remained relatively consistent over 3 days. Metagenomic analysis of the planktonic community composition, resolved at the genome level, showed dominance by Haloquadratum species and six uncultured members of the Halobacteriaceae. The post 0.8 μm filtrate contained six different nanohaloarchaeal types, three of which have not been identified previously, and cryo-transmission electron microscopy imaging confirmed the presence of small cells. Notably, these nano-sized archaea showed a strong diel cycle, with a pronounced increase in relative abundance over the night periods. We detected no eukaryotic algae or other photosynthetic primary producers, suggesting that carbon resources may derive from patchily distributed microbial mats at the sediment-water interface or from surrounding land. Results show the operation of a strong community-level diel cycle, probably driven by interconnected temperature, light abundance, dissolved oxygen concentration and nutrient flux effects.},
doi = {10.1038/ismej.2015.66},
journal = {The ISME Journal},
number = 12,
volume = 9,
place = {United States},
year = {Tue Apr 28 00:00:00 EDT 2015},
month = {Tue Apr 28 00:00:00 EDT 2015}
}
Web of Science
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