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Niche types and community assembly.

John Davison1, Maret Gerz1, Inga Hiiesalu1

  • 1Institute of Ecology and Earth Sciences, University of Tartu, Tartu, Estonia.

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|October 11, 2023
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Summary
This summary is machine-generated.

Arbuscular mycorrhizal fungal communities show less niche differentiation than expected, suggesting habitat filtering is key. Resource niche differentiation, however, indicates coexistence mechanisms are also important for biodiversity.

Keywords:
abiotic nichearbuscular mycorrhizal fungibiotic nichecondition nichehabitat filteringlimiting similarityniche differentiationresource nichestabilizing mechanism

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Area of Science:

  • Ecology
  • Mycology
  • Community Ecology

Background:

  • Niche differentiation studies often simplify complex niche spaces, potentially limiting understanding of community assembly.
  • Arbuscular mycorrhizal fungi (AMF) play crucial roles in ecosystems, but their community assembly is complex.

Purpose of the Study:

  • To investigate niche differentiation across multiple niche types in arbuscular mycorrhizal fungal communities.
  • To differentiate between abiotic/biotic and condition/resource niche axes for a comprehensive analysis.

Main Methods:

  • Utilized the full spectrum of realized niche types to analyze AMF communities.
  • Distinguished between abiotic and biotic, and condition and resource niche axes.
  • Employed a regional null model to assess niche differentiation against expectations.

Main Results:

  • Niche differentiation estimates varied moderately across different niche types.
  • Coexisting AMF taxa exhibited less niche differentiation than predicted by the null model, highlighting habitat filtering.
  • Resource niches were more differentiated than condition niches, supporting resource-based coexistence mechanisms.

Conclusions:

  • Considering diverse niche types, especially resource and condition axes, offers a more complete understanding of AMF community assembly.
  • Habitat filtering significantly influences AMF communities at the regional scale.
  • Resource niche differentiation suggests specific coexistence mechanisms are at play in AMF communities.