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Related Concept Videos

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Temporal Changes in the Function of Bacterial Assemblages Associated With Decomposing Earthworms.

Yao-Qin Sun1,2, Yuan Ge1,2

  • 1State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China.

Frontiers in Microbiology
|August 30, 2021
PubMed
Summary

Soil invertebrate decomposition, particularly earthworms, is faster early on. Microbial communities and dissolved organic matter (DOM) composition change rapidly, supporting the microbial structure-function hypothesis.

Keywords:
bacterial communitydecompositiondissolved organic matterearthwormstructure–function relationship

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Area of Science:

  • Ecology
  • Microbiology
  • Biogeochemistry

Background:

  • Soil invertebrate decomposition is crucial for nutrient cycling but poorly understood.
  • The roles of microbial communities and substrate chemistry in this process require further investigation.

Purpose of the Study:

  • To investigate changes in substrate chemistry and microbial communities during earthworm decomposition.
  • To determine the role of microbes in soil invertebrate decomposition and nutrient cycling.

Main Methods:

  • Earthworms (Amynthas corticis) were buried in soils with and without prior habitation.
  • Decomposition rates, dissolved organic matter (DOM) composition, and bacterial community dynamics were monitored over time.

Main Results:

  • Earthworm decomposition was rapid in the early stage (0-3 days), with increased DOM accumulation.
  • Bacterial richness and diversity peaked during early decomposition, correlating significantly with DOM composition changes.
  • Specific microbial functional groups involved in carbon, nitrogen, and sulfur cycling were linked to DOM changes.

Conclusions:

  • Early-stage earthworm decomposition involves rapid changes in both bacterial communities and DOM composition.
  • A significant positive correlation between bacterial community and DOM composition supports the microbial structure-function relationship in invertebrate decomposition.