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Spatial scale structure soil bacterial communities across an Arctic landscape.

Lucie A Malard1, Muhammad Zohaib Anwar2, Carsten S Jacobsen2

  • 1Faculty of Health and Life Sciences, Northumbria University, Newcastle-upon-Tyne NE1 8ST, United Kingdom lucie.malard@unil.ch david.pearce@northumbria.ac.uk.

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Summary

Spatial factors influence Arctic bacterial communities, with dispersal limitation around 60m. Taxa-environment links may not match their geographic spread, impacting ecological studies.

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Area of Science:

  • Microbial ecology
  • Environmental microbiology
  • Arctic research

Background:

  • Bacterial communities are shaped by environmental factors, especially in the Arctic.
  • The impact of spatial factors on Arctic bacterial community structure is not well understood.

Purpose of the Study:

  • To investigate the influence of spatial scale on bacterial community structure in an Arctic landscape.
  • To determine the spatial autocorrelation distance for independent sampling.
  • To identify indicator taxa and assess their relationship with environmental variables and spatial distribution.

Main Methods:

  • Analysis of bacterial community composition across an Arctic landscape.
  • Quantification of spatial factors' contribution to community variation.
  • Calculation of spatial autocorrelation distance to assess dispersal limitation.
  • Identification of indicator taxa and their correlation with environmental variables.

Main Results:

  • Spatial factors explained approximately 10% of bacterial community variation at the landscape scale.
  • A dispersal limitation (spatial autocorrelation) distance of approximately 60 meters was identified.
  • Strong statistical associations between indicator taxa and environmental variables were observed, but not always reflected in their geographical distribution.

Conclusions:

  • Conclusions on environmental drivers of bacterial communities are scale-dependent.
  • A sampling distance of ~60m is recommended for independent bacterial community samples in the Arctic.
  • Observed taxa-environment correlations may not accurately predict taxa distribution due to spatial factors.