Diel-scale temporal dynamics recorded for bacterial groups in Namib Desert soil
dc.citation.doi | DOI: 10.1038/srep40189 | en_ZA |
dc.contributor.author | Gunnigle, E. | |
dc.contributor.author | Frossard, A. | |
dc.contributor.author | Guerrero, L. | |
dc.contributor.author | Seely, M. | |
dc.contributor.author | Cowan, D.A. | |
dc.contributor.author | Ramond, J.-B. | |
dc.date.accessioned | 2017-10-09T10:55:22Z | |
dc.date.available | 2017-10-09T10:55:22Z | |
dc.date.issued | 2017-01 | |
dc.description.abstract | Microbes in hot desert soil partake in core ecosystem processes e.g., biogeochemical cycling of carbon. Nevertheless, there is still a fundamental lack of insights regarding short-term (i.e., over a 24-hour [diel] cycle) microbial responses to highly fluctuating microenvironmental parameters like temperature and humidity. To address this, we employed T-RFLP fingerprinting and 454 pyrosequencing of 16S rRNA-derived cDNA to characterize potentially active bacteria in Namib Desert soil over multiple diel cycles. Strikingly, we found that significant shifts in active bacterial groups could occur over a single 24-hour period. For instance, members of the predominant Actinobacteria phyla exhibited a significant reduction in relative activity from morning to night, whereas many Proteobacterial groups displayed an opposite trend. Contrary to our leading hypothesis, environmental parameters could only account for 10.5% of the recorded total variation. Potential biotic associations shown through co-occurrence networks indicated that non-random inter- and intra-phyla associations were 'time-of-day-dependent' which may constitute a key feature of this system. Notably, many cyanobacterial groups were positioned outside and/or between highly interconnected bacterial associations (modules); possibly acting as inter-module 'hubs' orchestrating interactions between important functional consortia. Overall, these results provide empirical evidence that bacterial communities in hot desert soils exhibit complex and diel-dependent inter-community associations. | en_ZA |
dc.description.librarian | EM2017 | en_ZA |
dc.identifier.citation | Gunnigle, E. et al. 2017. Diel-scale temporal dynamics recorded for bacterial groups in Namib Desert soil. SCIENTIFIC REPORTS 7, Article number 40189. | en_ZA |
dc.identifier.issn | 2045-2322 (Online) | |
dc.identifier.uri | http://hdl.handle.net/10539/23241 | |
dc.journal.title | SCIENTIFIC REPORTS | en_ZA |
dc.journal.volume | 7 | en_ZA |
dc.language.iso | en | en_ZA |
dc.publisher | Nature Publishing Group | en_ZA |
dc.rights | © 2017. The Author(s) . This work is licensed under a Creative Commons Attribution 4.0 International License. | en_ZA |
dc.subject | Microbes | en_ZA |
dc.subject | biogeochemical cycling | en_ZA |
dc.subject | microenvironmental parameters | en_ZA |
dc.subject | Namib Desert | en_ZA |
dc.subject | Actinobacteria phyla | en_ZA |
dc.title | Diel-scale temporal dynamics recorded for bacterial groups in Namib Desert soil | en_ZA |
dc.type | Article | en_ZA |
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