Question

Which one of the following processes is not likely to lead to the stable coexistence of two species at the same trophic level within an ecological community?

• A. Density-dependent predation
• B. Facilitation
• C. Intense interspecific competition
• D. Niche differentiation

Hint:

Coexistence at the same trophic level is more likely when species reduce direct competition through niche differentiation or facilitation.

Answer 1

The Correct Option is C

Step 1: Understanding coexistence mechanisms.
For two species to coexist at the same trophic level, their ecological niches must either not overlap or must be differentiated. Various processes help facilitate coexistence, such as facilitation and niche differentiation. Intense interspecific competition, however, tends to decrease the potential for coexistence by driving one species to outcompete the other.
Step 2: Analysis of options.
- (A) Density-dependent predation: Predation that depends on population density can regulate species numbers but may still allow coexistence by preventing either species from becoming overly abundant. - (B) Facilitation: This occurs when one species benefits another, which can help stabilize coexistence. - (C) Intense interspecific competition: High levels of competition typically reduce the chances of stable coexistence as one species is likely to dominate. - (D) Niche differentiation: This refers to the process where species evolve to occupy different ecological niches, thus reducing direct competition and facilitating stable coexistence.
Step 3: Conclusion.
The correct answer is (C) Intense interspecific competition, as it is the least likely to lead to the stable coexistence of two species at the same trophic level.