At which stage after clear-cutting does an ecosystem typically exhibit the greatest species richness?

• A. Before any vegetation has regrown
• B. During the intermediate stage of succession
• C. Immediately after clear-cutting
• D. At the climax community stage

Answer: (B)

Verified step by step guidance

1. Understand the concept of ecological succession: Ecological succession is the natural process by which ecosystems change and develop over time. It involves a series of stages, starting from a disturbed or bare area and progressing toward a stable climax community.
2. Recognize the stages of succession: Succession typically includes the following stages: (1) the initial stage (bare or disturbed area), (2) the early stage (pioneer species colonize), (3) the intermediate stage (increased diversity and complexity), and (4) the climax community (stable and mature ecosystem).
3. Identify species richness trends during succession: Species richness, or the number of different species in an ecosystem, tends to increase during the early and intermediate stages of succession as new species colonize and establish themselves. However, it may plateau or slightly decrease at the climax stage due to competitive exclusion.
4. Focus on the intermediate stage: During the intermediate stage of succession, the ecosystem typically exhibits the greatest species richness. This is because both pioneer species and later-arriving species coexist, creating a diverse and dynamic community.
5. Apply the concept to the question: Based on the understanding of succession, the stage after clear-cutting that exhibits the greatest species richness is the intermediate stage, as this is when the ecosystem is most diverse and species-rich.