Importance of relationships among organisms in an ecosystem
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Organisms occupy what are called niches. A niche includes the physical space in which they live, how they use the resources that are in that space, and how they interact with other organisms in that space. The interaction among organisms within or between overlapping niches can be characterized into five types of relationships: competition, predation, commensalism, mutualism and parasitism. The last three subtypes are classically defined as relationships exhibiting symbiosis, but predation and competition can also be considered as forms of symbiosis. Symbiosis refers to a close relationship in which one or both organisms obtain a benefit.
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