The Niche
The niche is one of the most important concepts in ecology. Paradoxically, it is also one of the hardest to define (Ecology is still a young science).
In essence, an organism’s niche is how it makes a living: the environmental conditions it tolerates, the important resources it needs to survive, and its ways of obtaining those resources.
In obtaining energy, nutrients, etc.. a populations of one species frequently interact with populations of other species.