A gradual change in a community's species composition,occurring as competing organisms respond to and modify the physical environment is termed:

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Ecological succession is the process by which species in a community gradually and sequentially replace one another in response to changes in the physical environment. As the abiotic (non-living) and biotic (living) factors change, different species are favored and establish themselves in the area, leading to a progression of different communities over time. This process can take anywhere from a few years to thousands of years, depending on the starting conditions and the rate of change.

A Gradual Change in a Community's Species Composition,occurring as Competing