Succession in ecology refers to?

• A. A rapid change in climate
• B. A random fluctuation in populations
• C. The gradual and orderly process of change in an ecosystem brought about by the progressive replacement of one community by another until a stable climax is established
• D. The immediate formation of a stable ecosystem after a disturbance

Answer: (C)

Succession in ecology is the gradual and orderly change in an ecosystem as one community is progressively replaced by another over time, often moving toward a relatively stable climax community that suits the climate and soil conditions. This involves stages of species arrival, soil development, and shifts in nutrient cycling and ecosystem structure, starting with pioneers and progressing to more complex communities.

For example, after a disturbance like a lava flow or a retreating glacier, bare ground is first colonized by hardy pioneer species, soil builds up, and over years to decades different plant communities replace one another until a mature forest or grassland stabilizes. This differs from rapid climate shifts, random population fluctuations, or an instant, post-disturbance stabilization, which do not capture the sequential, time-dependent nature of succession.