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Energetic and Environmental Constraints on the Community Structure of Benthic Microbial Mats in Lake Fryxell, Antarctica

Dillon, Megan L
; 
Hawes, Ian
; ; 
Mackey, Tyler J
; 
Eisen, Jonathan A
; 
Doran, Peter T
; 
Sumner, Dawn Y
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2020-01-06
Submitted Date
2019-04-01
Subject Terms
Antarctica
microbial mat
energy
Lake Fryxell
oxygen
Photosynthetically Active Radiation
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Science
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ABSTRACT: Ecological communities are regulated by the flow of energy through environments. Energy flow is typically limited by access to photosynthetically active radiation (PAR) and oxygen concentration (O2). The microbial mats growing on the bottom of Lake Fryxell, Antarctica, have well-defined environmental gradients in PAR and (O2). We analyzed the metagenomes of layers from these microbial mats to test the extent to which access to oxygen and light controls community structure. We found variation in the diversity and relative abundances of Archaea, Bacteria and Eukaryotes across three (O2) and PAR conditions: high (O2) and maximum PAR, variable (O2) with lower maximum PAR, and low (O2) and maximum PAR. We found distinct communities structured by the optimization of energy use on a millimeter-scale across these conditions. In mat layers where (O2) was saturated, PAR structured the community. In contrast, (O2) positively correlated with diversity and affected the distribution of dominant populations across the three habitats, suggesting that meter-scale diversity is structured by energy availability. Microbial communities changed across covarying gradients of PAR and (O2). The comprehensive metagenomic analysis suggests that the benthic microbial communities in Lake Fryxell are structured by energy flow across both meter- and millimeter-scales.
Citation
Megan L Dillon, Ian Hawes, Anne D Jungblut, Tyler J Mackey, Jonathan A Eisen, Peter T Doran, Dawn Y Sumner, Energetic and Environmental Constraints on the Community Structure of Benthic Microbial Mats in Lake Fryxell, Antarctica, FEMS Microbiology Ecology, Volume 96, Issue 2, February 2020, fiz207, https://doi.org/10.1093/femsec/fiz207
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Oxford University Press (OUP)
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FEMS Microbiology Ecology
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http://hdl.handle.net/10141/623318
DOI
10.1093/femsec/fiz207
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Journal Article
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Copyright C FEMS 2020. This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited. For commercial re-use, please contact journals.permissions@oup.com. The attached file is the published version of the article.
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0168-6496
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1574-6941
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