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Residence Time Structures Microbial Communities Through Niche Partitioning.

Emmi A Mueller1, Jay T Lennon1

  • 1Department of Biology, Indiana University, Bloomington, Indiana, USA.

Ecology Letters
|February 26, 2025
PubMed
Summary
This summary is machine-generated.

Residence time (τ) significantly impacts microbial communities in flowing systems. Longer residence times increase microbial abundance and diversity but decrease productivity, revealing niche partitioning in diverse ecosystems.

Keywords:
chemostatcommunity assemblyconsumer‐resourceimmigrationniche partitioning

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Area of Science:

  • Ecology
  • Microbiology
  • Environmental Science

Background:

  • Flowing ecosystems are ubiquitous, including environmental, engineered, and host-associated habitats.
  • Residence time (τ), the ratio of volume (V) to flow rate (Q), is a key factor influencing ecological processes.
  • Theoretical predictions suggest contrasting effects of short and long residence times on species immigration, establishment, and resource availability.

Purpose of the Study:

  • To experimentally investigate the impact of residence time on a lake microbial community.
  • To understand how residence time influences microbial abundance, diversity, and community functions.
  • To identify patterns of species distribution along a gradient of residence times.

Main Methods:

  • Microbial communities were exposed to a wide range of residence times (seven orders of magnitude) using chemostats.
  • Measurements included microbial abundance, richness, evenness, productivity, and resource consumption.
  • Analysis focused on non-linear responses and the identification of distinct microbial taxa associated with different residence times.

Main Results:

  • Microbial abundance, richness, and evenness exhibited a non-linear increase with longer residence times.
  • Key ecosystem functions, such as productivity and resource consumption, decreased as residence time increased.
  • Distinct microbial taxa were identified as specialists for either short or long residence times, indicating niche partitioning.

Conclusions:

  • Residence time is a critical determinant of biodiversity and community function in flowing habitats.
  • The study provides empirical evidence for niche partitioning driven by residence time in microbial communities.
  • Findings have implications for managing and understanding diverse flowing ecosystems.