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Quantifying functional redundancy in polysaccharide-degrading prokaryotic communities.

Dan-Dan Li1,2, Jianing Wang1, Yiru Jiang1

  • 1State Key Laboratory of Microbial Technology, Institute of Microbial Technology, Shandong University, Qingdao, 266237, China.

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|July 3, 2024
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Summary

Functional redundancy in microbial communities, particularly for carbohydrate degradation, is a stable trait. It is influenced by microbial diversity and environmental factors, revealing key insights into ecosystem functions.

Keywords:
Between-communityCommunity diversityFunctional redundancyGlycoside hydrolaseProkaryotic communitiesQuantificationWithin-community

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Area of Science:

  • Microbial Ecology
  • Molecular Biology
  • Biogeochemistry

Background:

  • Functional redundancy (FR) is prevalent but its formation and drivers remain unclear.
  • Within-community FR involves diverse microbes with shared functions; between-community FR involves distinct microbial assemblies performing similar roles.
  • Quantified FR within and between communities using glycoside hydrolases (GHs) in global prokaryotic samples.

Purpose of the Study:

  • To propose and apply novel formulas for quantifying functional redundancy.
  • To investigate the factors influencing functional redundancy of carbohydrate degradation functions.
  • To explore the relationship between prokaryotic community biodiversity and ecosystem functions.

Main Methods:

  • Developed two formulas to quantify within- and between-community functional redundancy.
  • Analyzed functional redundancy of carbohydrate degradation using glycoside hydrolase (GH) gene data from global prokaryotic samples.
  • Assessed the impact of alpha and beta diversity and environmental factors (pH, temperature, salinity) on FR.

Main Results:

  • Glycoside hydrolases are encoded by multiple, taxonomically distinct prokaryotes within communities.
  • Prokaryotic communities exhibit distinct enzyme-encoding populations across different locations.
  • Functional redundancy is significantly influenced by alpha and beta diversity, as well as environmental parameters.
  • Deterministic factors primarily govern the functional redundancy of prokaryotic communities.

Conclusions:

  • Functional redundancy of glycoside hydrolases is a stable characteristic of microbial communities.
  • This study elucidates the formation process and influencing factors of functional redundancy.
  • Provides novel insights into the links between microbial biodiversity and ecosystem functions.