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Diversity and distribution of sediment bacteria across an ecological and trophic gradient

View ORCID ProfileHailey M. Sauer, Trinity L. Hamilton, View ORCID ProfileRika E. Anderson, Charles E. Umbanhowar Jr., Adam J. Heathcote
doi: https://doi.org/10.1101/2021.09.20.461123
Hailey M. Sauer
1Department of Plant and Microbial Biology, University of Minnesota, St. Paul, MN, 55108 USA
2St. Croix Watershed Research Station, Science Museum of Minnesota, Marine on St. Croix, MN, 55047, USA
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Trinity L. Hamilton
1Department of Plant and Microbial Biology, University of Minnesota, St. Paul, MN, 55108 USA
3The Biotechnology Institute, University of Minnesota, St. Paul, MN, 55108 USA
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  • For correspondence: trinityh@umn.edu
Rika E. Anderson
4Biology Department, Carleton College. Northfield, MN, 55057 USA
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Charles E. Umbanhowar Jr.
5Departments of Biology and Environmental Studies, St. Olaf College, Northfield, MN, USA, 55057 USA
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Adam J. Heathcote
2St. Croix Watershed Research Station, Science Museum of Minnesota, Marine on St. Croix, MN, 55047, USA
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Abstract

Can we cluster bacterial sediment communities based on lake size, depth, and trophic status? Or, are bacterial microbial communities an emergent property of their geography, integrating regional physical and climatic conditions? Lakes in Minnesota are uniquely situated to address these questions because of their wide geographic range and variability in size and basin land-use. In this study, we selected twenty lakes with varying morphological and chemical properties across four ecological regions of Minnesota. Our objectives were to (i)) evaluate the diversity and spatial variation of the bacterial community at the sediment-water interface and (ii) determine how lake location and watershed land-use impact aqueous chemistry and influence community structure. Our data indicate that sediment communities from similar depth intervals are more likely to cluster by ecological region rather than any individual lake properties (e.g., trophic status, TP concentration, lake depth). However, composition is tied to a given lake, wherein samples from the same core were more alike than samples at similar depths across lakes. Our results illustrate the diversity within lake sediment microbial communities and provide insight into relationships between taxonomy, physicochemical, and geographic properties of north temperate lakes.

Competing Interest Statement

The authors have declared no competing interest.

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY 4.0 International license.
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Posted September 20, 2021.
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Diversity and distribution of sediment bacteria across an ecological and trophic gradient
Hailey M. Sauer, Trinity L. Hamilton, Rika E. Anderson, Charles E. Umbanhowar Jr., Adam J. Heathcote
bioRxiv 2021.09.20.461123; doi: https://doi.org/10.1101/2021.09.20.461123
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Diversity and distribution of sediment bacteria across an ecological and trophic gradient
Hailey M. Sauer, Trinity L. Hamilton, Rika E. Anderson, Charles E. Umbanhowar Jr., Adam J. Heathcote
bioRxiv 2021.09.20.461123; doi: https://doi.org/10.1101/2021.09.20.461123

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