Which term describes the ecological change in community structure over time after a disturbance?

Which term describes the ecological change in community structure over time after a disturbance?

• A. Evolution
• B. Migration
• C. Succession
• D. Adaptation

Answer: (C)

Ecological succession describes how a community’s species composition and structure change over time after a disturbance. Right after disturbance, pioneer species establish and begin to alter the environment (like soil, light, or nutrients), making it possible for other species to settle. As conditions shift, different organisms replace the earlier ones, leading to changes in biomass and diversity until the community settles into a more stable configuration under the prevailing environment. This process can be primary (starting from bare land) or secondary (recovery after soil and some organisms remain). The other terms don’t describe this orderly, time-ordered change in who lives there. Evolution refers to genetic changes within populations across generations; migration is the movement of organisms into or out of an area; adaptation is a trait change that improves fitness, which can occur during succession but isn’t the pattern describing the sequence of community changes itself.

Ecological succession describes how a community’s species composition and structure change over time after a disturbance. Right after disturbance, pioneer species establish and begin to alter the environment (like soil, light, or nutrients), making it possible for other species to settle. As conditions shift, different organisms replace the earlier ones, leading to changes in biomass and diversity until the community settles into a more stable configuration under the prevailing environment. This process can be primary (starting from bare land) or secondary (recovery after soil and some organisms remain).

The other terms don’t describe this orderly, time-ordered change in who lives there. Evolution refers to genetic changes within populations across generations; migration is the movement of organisms into or out of an area; adaptation is a trait change that improves fitness, which can occur during succession but isn’t the pattern describing the sequence of community changes itself.