Composition and Interactions among Bacterial, Microeukaryotic, and T4-like Viral Assemblages in Lakes from Both Polar Zones

• Published in: Frontiers in Microbiology
• Main Authors: Aguirre de Cárcer, Daniel, Pedrós-Alió, Carlos, Pearce, David A., Alcamí, Antonio
• Other Authors: European Commission, Ministerio de Ciencia e Innovación (España)
• Format: Article in Journal/Newspaper
• Language: English
• Published: Frontiers Media 2016
• Subjects: Bacteria; Microeukaryotes; T4phages; Pyrosequencing; Diversity; Lakes; Polar; Antarctic; The Antarctic; Antarc*
• Online Access: http://hdl.handle.net/10261/130807; https://doi.org/10.3389/fmicb.2016.00337; https://doi.org/10.13039/501100000780; https://doi.org/10.13039/501100004837

11 pages, 4 figures, 4 tables, supplementary material http://dx.doi.org/10.3389/fmicb.2016.00337 In this study we assess global biogeography and correlation patterns among three components of microbial life: bacteria, microeukaryotes, and T4-like myoviruses. In addition to environmental and biogeographical considerations, we have focused our study on samples from high-latitude pristine lakes from both poles, since these simple island-like ecosystems represent ideal ecological models to probe the relationships among microbial components and with the environment. Bacterial assemblages were dominated by members of the same groups found to dominate freshwater ecosystems elsewhere, and microeukaryotic assemblages were dominated by photosynthetic microalgae. Despite inter-lake variations in community composition, the overall percentages of OTUs shared among sites was remarkable, indicating that many microeukaryotic, bacterial, and viral OTUs are globally-distributed. We observed an intriguing negative correlation between bacterial and microeukaryotic diversity values. Notably, our analyses show significant global correlations between bacterial and microeukaryotic community structures, and between the phylogenetic compositions of bacterial and T4-like virus assemblages. Overall, environmental filtering emerged as the main factor driving community structures This work was funded by the Spanish Polar Programme and the Spanish Ministry of Science and Innovation grants CTM2008-05134-E/ANT, CTM2009-08644-E, and CTM2011-15091-E/ANT. We thank Roche for their support to the Antarctic expedition. DA was supported by the Marie Curie IIF grant PIIF-GA-2012-328287 USD 1,900 APC fee funded by the EC FP7 Post-Grant Open Access Pilot Peer reviewed