A species whose distribution is restricted to small geographical area due to the presence of a comparatively superior species, expands its distribution when the competing species is experimentally removed. This phenomenon is called

Options

A. Competitive exclusion
B. Competitive release
C. Competitive arrival
D. Interference competition

Answer

To solve the question, we need to identify the phenomenon described, which involves a species expanding its distribution when a competing species is removed.

### Step-by-Step Solution:

1. **Understand the Scenario**: The question describes a situation where one species is limited in its geographical distribution due to the presence of another species that is competitively superior. This means that the superior species is outcompeting the other for resources.

2. **Identify the Key Terms**:
- "Distribution restricted to a small geographical area"
- "Competitively superior species"
- "Expands its distribution when the competing species is removed"

3. **Analyze the Options**:
- **Option 1: Competitive Exclusion**: This refers to the principle that two species competing for the same resources cannot coexist at constant population values. One will outcompete the other, leading to the exclusion of the less competitive species.
- **Option 2: Competitive Release**: This term describes the phenomenon where a species expands its range or population size when a competitor is removed. This matches the scenario described in the question.
- **Option 3: Competitive Arrival**: This is not a standard ecological term and does not fit the context.
- **Option 4: Interference Competition**: This refers to direct interactions between species that inhibit one another, but it does not specifically address the expansion of distribution upon removal of a competitor.

4. **Select the Correct Answer**: Based on the analysis, the correct answer is **Option 2: Competitive Release**. This is the phenomenon where a species expands its distribution when the competing species is experimentally removed.

### Final Answer:
The phenomenon is called **Competitive Release**.

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