Commensalism
Commensalism - Related Videos
04:45
Swab-based Conjunctival Commensal Bacteria Isolation: A Technique to Isolate Commensal Bacteria from Conjunctiva of Murine Model
0 Views •
2025
This video describes a swab-based technique to isolate viable commensal bacteria from the ocular conjunctiva. The technique can be used to profile the commensal bacterial microbiome of the conjunctiva, which plays a defensive role against pathogens.
07:52
Conjunctival Commensal Isolation and Identification in Mice
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2021
Presented here is a protocol for the isolation and amplification of aerobic and facultative anaerobic mouse conjunctival commensal bacteria using a unique eye swab and culture-based enrichment step with subsequent identification by microbiological based methods and MALDI-TOF mass spectrometry.
07:20
Human Colonoid Monolayers to Study Interactions Between Pathogens, Commensals, and Host Intestinal Epithelium
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Cited by 45 •
2019
Here, we present a protocol to culture human enteroid or colonoid monolayers that have intact barrier function to study host epithelial-microbiota interactions at the cellular and biochemical level.
07:02
Quantifying Human Norovirus Virus-like Particles Binding to Commensal Bacteria Using Flow Cytometry
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Cited by 8 •
2020
The goal of this protocol is to quantify binding of the eukaryotic pathogen human norovirus to bacteria. After performing an initial virus-bacterium attachment assay, flow cytometry is used to detect virally-bound bacteria within the population.
06:32
A Galleria mellonella Oral Administration Model to Study Commensal-Induced Innate Immune Responses
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Cited by 12 •
2019
Here, we provide a detailed protocol for an oral administration model using Galleria mellonella larvae and how to characterize induced innate immune responses. Using this protocol, researchers without practical experience will be able to use the G. mellonella force-feeding method.
FAQs
A remora gains transportation by attaching to a shark and can feed on leftover meals from the shark’s feeding activity. This arrangement gives the remora access to food and movement through its habitat without substantially affecting the shark. The example illustrates how a species can exploit opportunities created by another organism without forming a mutually beneficial exchange.
Epiphytic plants use trees for physical support, allowing them to occupy space without substantially benefiting or harming the tree. The tree functions as a structure that improves access to habitat, while the plant gains support rather than food directly from the tree. This example highlights how resource access can produce a commensal association.
Biologists distinguish these interactions by evaluating the outcome for each participant. If both species benefit, the relationship is mutualism; if one benefits while the other is harmed, it is parasitism. Commensalism occupies the contrasting case in which the associated organism benefits while its partner experiences no significant benefit or harm, making partner effects central to classification.
Food, shelter, transportation, and access to resources are key benefit categories used to examine commensal relationships. A researcher can ask which organism gains the opportunity, what resource or condition enables that gain, and whether the associated organism shows a significant benefit or harm. These questions connect the visible interaction with its ecological mechanism.
Researchers study commensalism by identifying the species involved, describing the resource or opportunity obtained by one participant, and evaluating the effect on the other. They may then classify the interaction and compare it with mutualism or parasitism. This approach helps connect individual associations to broader patterns of community structure and resource sharing.
Commensalism shows that organisms can share habitats and resources even when the benefits are unevenly distributed. Associations involving food, shelter, transportation, or support can influence how species occupy a community and use available opportunities. Examining these relationships therefore helps biologists interpret community structure rather than focusing only on interactions in which both partners benefit.