Question

During the process of succession in a community, species that are good colonizers are gradually replaced by species that are good competitors. Which one or more of the following statements is/are consistent with this pattern?

• A. Initially, there is great resource limitation.
• B. Keystone species must establish first to facilitate the later establishment of higher trophic level species.
• C. Trees are the climax stage of terrestrial communities and generally have low competitive ability, but high dispersal ability.
• D. For many taxa, there is a tradeoff between dispersal ability and local competitive ability.

Hint:

Analyzing ecological trade-offs provides insights into how species traits influence their roles within ecological communities, especially during succession stages.

Answer 1

The Correct Option is D

Step 1: Overview of Ecological Succession. In ecological succession, initial stages often involve species exploiting readily available resources, with later stages dominated by species adapted for competitive environments. Step 2: Evaluation of Options. Option (A): Incorrect as early succession stages are characterized by abundant resources, not limitation.
Option (B): Partially correct; early colonizers can enable more complex communities, but are not necessarily keystone species.
Option (C): Incorrect; climax community trees have developed high competitive abilities to maintain their dominance.
Option (D): Correct; this reflects ecological principles where a tradeoff between dispersal and competitive abilities is common.
\medskip