Introduction:
The microorganisms that occupy the soil evince many divergent types of associations or interactions some of the associations are adequate or neutral:some are beneficial or positive:further are deleterious or negative .as respectively discrete type of association or interaction is discovered;it has been given a specific illustrative label .as you might venture ;many of these associations do not fall neatly into discrete categories.furthermore;and likewise not unexpected;there is the existence of some confusion and contradiction in the use of terms the term symbiosis;for example;as first proposed;referred to the "living together of dissimilar named organisms":it was used as a general term later it took on a more specific meaning;namely;an association between bacteria and plants referred to as symbiotic nitrogen fixation.
Types of microbial associations:
The following types of microbial associations:
Positive or beneficial:mutualism;commensalism
Neutral:neutralism
Negative or detrimental:antagonism competition parasitism predation.
Neutral associations:
Neutralism:
It is workable that two different species of microorganism occupy the identical environment without affecting every other as an instance;each could utilize extraordinary nutrients without producing metabolic end products that are inhibitory such a condition might be transitory;as condition change in the environment;particularly availability of nutrients;the relationship might change.
Positive associations:
Mutualism:
Mutualism is an example of a symbiotic relationship in which each organism benefits from the association the way in which advantage is derived varies one type of mutualistic association is that related to the exchange of nutrients between two species a phenomenon referred to as obligate mutualistic metabolism many microorganisms synthesize vitamins and amino acids in excess of their nutritional requirements others have a need for one or more of these nutrients still others synthesize a particular essential nutrient in suboptimal aggregate hence certain combinations of species will grow together but not apart when nutrient levels are very low leaching is pone of the technique for convalescing metals from ore;microorganism play the crucial role of oxidizing insoluble metal sulfides to soluble sulfides for example mutualism in ore leaching had been injected into a medium freed from brought nitrogen and also carbon resources;leaching surroundings decreed carbon or decreed nitrogen.
Commensalism:
The phenomenon of commensalism refers to a relationship between organisms wherein one species of blessing other is not affected this happens usually in soil with respect to degradation of complicated molecules like cellulose and lignin for example; many fungi are capable of multiple cellulose to glucose and beyond many bacteria are unable to utilize cellulose they can and do utilize the fungal breakdown products of cellulose for example glucose and organic acids the presence of many nutritionally fastidious bacteria in soil shows that their growth and survival is dependent upon the synthesis and excretion of vitamins and amino acid by way of less fastidious species.
Negative association:
Antagonism:
When one species adversely influences the environment for every other species .it is said to be antagonism .such as; organism may be of extraordinary realistic significance when you consider that they regularly produce antibiotics or other inhibitory substances which affect the normal growth processes or survival of other organisms.
Competition:
When two or more species compete for the same environment.
Predation:
Predation is the act of one animal feeding on another.
Parasitism:
A parasitism correspondence wherein one organism convenience and one is dangerous.
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