Niches & competition
- In interspecies competition, two species use the same limited resource. Competition has a negative effect on both of the species (-/- interaction).
- A species' niche is basically its ecological role, which is defined by the set of conditions, resources, and interactions it needs (or can make use of).
- The competitive exclusion principle says that two species can't coexist if they occupy exactly the same niche (competing for identical resources).
- Two species whose niches overlap may evolve by natural selection to have more distinct niches, resulting in resource partitioning.