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When one looks at the factors that affect the size and growth of population of a species, one implicitly assumes that the population of one species would be completely unaffected by populations of other species that happened to be found in the same area. Similarly when one considers how individuals of a population interact with each other in the domain of behaviour ecology, one implicitly assumes that the only individuals that matter were individuals of the same species. In other words, species that happen to overlap their habitats do not interact in any way that would affect each other’s density or distribution or behaviour. More often than not, however, this assumption is not met and the distribution in abundance of the behaviour of species depends not only on the resources that are critical for that particular species but also on the distribution and abundance of other species that coexist with it (Campbell & Reese ch 53).

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