Related Experiment Video
Updated: Mar 9, 2026
06:45
Monitoring Intraspecies Competition in a Bacterial Cell Population by Cocultivation of Fluorescently Labelled Strains
Published on: January 18, 2014
9.1K
Disturbance Regimes Predictably Alter Diversity in an Ecologically Complex Bacterial System
Sean M Gibbons1,2, Monika Scholz3,4, Alan L Hutchison3,5
1Graduate Program in Biophysical Sciences, University of Chicago, Chicago, Illinois, USA sean.gibbons@fulbrightmail.org.
Mbio
|December 22, 2016
Summary
Microbial diversity and ecosystem stability are linked. Disturbances can temporarily increase microbial diversity by mixing communities, but this diversity is often unstable, highlighting the need for further research into microbial ecology.
Area of Science:
- Microbial Ecology
- Ecosystem Dynamics
- Community Ecology
Background:
- Microbial diversity is crucial for ecosystem functioning and stability.
- Predicting microbial diversity responses to environmental disturbances is vital.
- Previous studies on diversity-disturbance relationships in microbial systems are limited.
Purpose of the Study:
- To systematically investigate diversity-disturbance relationships in microbial microcosm communities.
- To understand the conditions under which diversity maxima are stable.
- To explore the dynamics of microbial community states under varying disturbance regimes.
Main Methods:
- Utilized complex microbial microcosm communities under a range of disturbance regimes.
- Observed reproducible community state switching and transient diversity maxima.
- Formulated a simple mathematical model to identify stable diversity maxima regimes.
Main Results:
- A reproducible switch between community states was observed, leading to transient diversity maxima upon mixing.
- Community compositional stability decreased when diversity was highest.
- The mathematical model identified specific regimes for stable diversity maxima.
Conclusions:
- Both unimodal and non-unimodal diversity-disturbance relationships can arise from switches between distinct microbial community states.
- Transient unimodality is likely common in fluctuating microbial ecosystems.
- Findings have implications for understanding microbial ecology in heterogeneous environments.
Related Concept Videos
02:26Ecological Disturbance
21.3K
An ecological disturbance is a temporary disruption in the environment resulting from abiotic, biotic, or anthropogenic factors, causing a pronounced change in an ecosystem. The impact of an ecological disturbance, which can depend on its intensity, frequency, and spatial distribution, plays a significant role in shaping the species diversity within the ecosystem.
21.3K
01:28Global Regulatory Systems
812
Global regulatory systems in bacteria enable rapid and coordinated responses to environmental changes by integrating sensory inputs with gene expression, ensuring efficient adaptation to fluctuating conditions. Key global regulatory mechanisms include regulons, two-component systems, sigma factors, and secondary messengers.Regulons and Global RegulatorsA regulon is a collection of genes and operons controlled by a common global regulator. These regulators enable bacteria to prioritize resource...
812
01:28Gene Regulation in Microbial Communities: Quorum Sensing
802
Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
802
01:30Other Stress Responses in Bacteria
483
Bacteria have global regulatory systems that control several types of stress mechanisms. These include Pho regulon and the heat shock response, which are essential systems for environmental adaptation, such as nutrient limitation and proteotoxic stress. The Pho regulon and the heat shock response exemplify bacterial resilience, enabling rapid adaptation to fluctuating environmental conditions.Pho RegulonBacteria require phosphorus for essential cellular processes, including nucleic acid...
483
01:26Bacterial Phylum Bacteroidota
782
The phylum Bacteroidota includes over 700 species classified into four primary orders: Bacteroidales, Cytophagales, Flavobacteriales, and Sphingobacteriales. These gram-negative, non-sporulating rods exhibit saccharolytic capabilities and can be aerobic or fermentative, encompassing obligate aerobes, facultative aerobes, and obligate anaerobes. Many species display gliding motility, though some are nonmotile or use flagella. The genus Bacteroides is well-studied due to its significant role in...
782
01:28Biological Methods for Microbial Control
1.1K
Biological agents offer an effective means of controlling microbial growth by leveraging natural processes like predation, competition, and the secretion of antimicrobial substances.Predatory bacteria such as Bdellovibrio species target and kill pathogens like Salmonella and E. coli. They are widely used in poultry farms to control infections. Myxococcus species help combat plant-pathogenic fungi. These naturally occurring predators serve as eco-friendly alternatives to chemical pesticides and...
1.1K