examples of microbial commensialism?

About microscopic forms of life, including Bacteria, Archea, protozoans, algae and fungi. Topics relating to viruses, viroids and prions also belong here.

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examples of microbial commensialism?

Post by ManBearPig89 » Sun Nov 28, 2010 3:35 am


Anyone have a good example of commensalism (one organism living in symbiosis with another organism, with the one org. benefiting, while the other is unaffected) in microbiology?

What I can think of is perhaps some of the natural bacteria living on our skin. I know they are good for us (competing with potentialy patogenic bacteria) , but are they (all) _directly_ good for us (producing some kind of waste product we benifit from) ?

what about bacteria in the intestine?

also (I am wondering) can a parasite, say malaria, using an intermediate host be considerd commensial - while living in the intermediate?

what about certiain lysogenetic viruses (integrating in host- DNA, not nesseceraly producing any phenotype, or go in lysis), can they be considerd to be commensial?

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Post by magicsiew » Sun Nov 28, 2010 10:45 am

Commensalism involve 1 participant getting advantage while the host dint not get any benefit from it.

Bacteria that lives on our skin cant really considered as commensalism, as they are potential pathogenic to human. The reason they dint not harm us is because we have immune system.

Natural occurring bacteria in intestine can consider as mutualism where both bacteria and human get benefit. This is because the bacteria get nutrient and habitat, while they are able to digest some nutrient that we cant digest.

Those intermediate that live in the body, they take up nutrient and daily essential from out body, without contributing. Same to lysogenic viruses, even in lysogenic state, when cell duplicate, they also been duplicate, which takes up more energy and building material.

For microbial commensalism, you can find example on Acanthamoeba, because many bacteria can become endosymbiont in Acanthamoeba, which get protection and transportation from it. Similar to the example of shark and remora fish, which is an ectosymbiont.

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Re: examples of microbial commensialism?

Post by sfhdweb » Mon Dec 13, 2010 12:17 pm

thanks for sharing

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Post by JackBean » Mon Dec 13, 2010 12:23 pm

what about some bacteria producing antibiotics and other, which is not affected, but is protected against other strains?

Cis or trans? That's what matters.

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