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Bacterial Community Structure at the Microscale in Two Different Soils.

Rory Michelland1,2,3, Jean Thioulouse1,2,4, Martina Kyselková5

  • 1Université de Lyon, 69622, Lyon, France.

Microbial Ecology
|July 16, 2016
PubMed
Summary

Soil bacterial communities exhibit distinct spatial patterns at the microscale. Core bacterial taxa are widespread, while satellite taxa are more localized, influencing ecosystem functions.

Keywords:
Abundancy-occupancy relationshipBacteria community structureFrequency-occupancy relationshipMicroscale in soilSoil microbial diversitySoil structure

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Area of Science:

  • Soil microbiology
  • Ecosystem ecology
  • Biogeography

Background:

  • Soil bacterial spatial distributions are crucial for ecosystem functions like gene transfer and xenobiotic degradation.
  • While large-scale bacterial biogeography is documented, microscale data remain scarce.
  • Understanding microscale bacterial distribution is key to defining community spatial traits.

Purpose of the Study:

  • To determine the spatial pattern of bacterial diversity in spatially referenced microsamples.
  • To define bacterial community spatial traits at the microscale.
  • To investigate the influence of soil aggregation on bacterial spatial distribution.

Main Methods:

  • Studied two soils with contrasting aggregation: moderately aggregated (LCSA) and poorly aggregated (LD).
  • Analyzed bacterial spatial distribution in 3mm microsamples along 10- and 20-cm transects using a taxonomic microarray.
  • Employed 16S rRNA gene sequencing for further spatial analysis in LD soil.

Main Results:

  • Frequency-occupancy plots in both soils followed Hanski's core-satellite theory, showing bimodality.
  • Microscale spatial distributions differed between soils, particularly in the percentage of core taxa.
  • Core taxa were widespread (<3mm), while satellite taxa showed broader distribution (>5cm).
  • A positive abundance-occupancy relationship was observed at the fine scale.

Conclusions:

  • Bacterial communities exhibit distinct core-satellite structures at the microscale.
  • Soil physical structure influences bacterial spatial distribution patterns.
  • Further research is needed to link fine-scale bacterial spatial distributions to soil functions.