Bacterial Community Assembly
Bacterial Community Assembly - Related Videos
09:59
Community DNA Extraction from Bacterial Colonies
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2023
Source: Laboratories of Dr. Ian Pepper and Dr. Charles Gerba - The University of Arizona Demonstrating Author: Luisa Ikner Traditional methods of analysis for microbial communities within soils have usually involved either cultural assays utilizing dilution and plating methodology on selective and differential media or direct count assays. Direct counts offer information about the total number of bacteria present, but give no information about the number or diversity of populations present...
09:24
Assembly and Tracking of Microbial Community Development within a Microwell Array Platform
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Cited by 12 •
2017
The development of microbial communities depends on a combination of factors, including environmental architecture, member abundance, traits, and interactions. This protocol describes a synthetic, microfabricated environment for the simultaneous tracking of thousands of communities contained in femtoliter wells, where key factors such as niche size and confinement can be approximated.
02:56
Isolation of Mouse Bladder Epithelial Cells Containing Intracellular Bacterial Communities
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2026
Source: Yang, E., et al. Isolation of Single Intracellular Bacterial Communities Generated from a Murine Model of Urinary Tract Infection for Downstream Single-cell Analysis. J. Vis. Exp. (2019)This video demonstrates the manual isolation of single epithelial cells containing intracellular bacterial communities from infected mouse bladder using mouth micropipetting, enabling downstream single-cell analysis of viable host-associated E. coli populations in urinary tract infection...
02:06
Visualizing Intracellular Bacterial Communities in an Infected Mouse Bladder
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2026
Source: Conover, M. S. et. al., Establishment and Characterization of UTI and CAUTI in a Mouse Model. J. Vis. Exp. (2015)This video demonstrates the detection of intracellular bacterial communities (IBCs) in mouse bladder tissue infected with β-galactosidase-expressing Escherichia coli. Following tissue fixation, permeabilization, and staining with X-gal, IBCs appear as blue puncta under a dissecting microscope, confirming bacterial invasion during urinary tract infection.
02:54
Exposing a Synthetic Oral Bacterial Community to Simulated Phases of Digestion
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2025
Source: Arroyo, M. C., et al. Assessing the Viability of a Synthetic Bacterial Consortium on the In Vitro Gut Host-microbe Interface. J. Vis. Exp. (2018)This video demonstrates the viability assessment of a synthetic oral microbial community during simulated oral, gastric, and intestinal digestion. Bacterial survival is quantified after each phase, revealing a progressive decline due to digestive stress.
FAQs
Priority effects occur when the order or timing of species arrival influences which organisms establish successfully. Early colonizers can change local conditions or consume resources, making the environment more or less suitable for later arrivals. Consequently, communities exposed to similar environmental conditions may develop different compositions when their colonization histories differ, affecting later abundance patterns and ecosystem or host outcomes.
Environmental filtering favors bacteria whose traits match local physical and chemical conditions, while resource availability determines which organisms can obtain energy or materials for growth. These influences restrict establishment and help explain why communities differ among environments. Changes in local conditions or available resources can therefore shift which bacteria persist and alter the functions associated with the community.
Competition can prevent some bacteria from persisting when organisms depend on similar resources or occupy overlapping ecological roles. Cooperation may instead support coexistence when community members benefit from one another's activities. The balance between these interactions influences abundance changes after establishment, helping determine whether a community becomes dominated by particular bacteria or maintains a broader range of members.
A useful analysis considers dispersal, arrival sequence, environmental conditions, resources, persistence, and interactions among community members. Researchers can relate these factors to changes in composition and abundance over time rather than examining membership at only one point. This approach helps distinguish whether local conditions, colonization history, or biological interactions best explain the observed community structure and function.
Following assembly helps researchers determine why particular bacteria establish during microbiome development and how local conditions influence their persistence. The same framework can reveal why a microbiome changes after environmental disturbance or treatment. Understanding these shifts supports efforts to predict community responses and connect changes in bacterial composition with consequences for host health or ecosystem function.
Assembly principles can guide the design of microbial consortia, which are deliberately composed groups of bacteria selected to coexist and perform useful functions. In biotechnology, agriculture, and bioremediation, researchers can consider resource availability, environmental filtering, and interactions when developing these communities. The goal is to improve establishment and maintain activities that support the intended application.