Resource partitioning was shown by

Options

A. Connell
B. MacArthur
C. Gause
D. Allen

Answer

To solve the question "Resource partitioning was shown by," we need to identify the scientist associated with the concept of resource partitioning.

### Step-by-Step Solution:

1. **Understanding Resource Partitioning**:
- Resource partitioning refers to the way in which species divide resources to reduce competition. This can occur through different feeding times, foraging patterns, or habitats.

2. **Identifying Key Scientists**:
- The question mentions several scientists: Gauss, MacArthur, Cornell, and Ellen. We need to determine which one is linked to resource partitioning.

3. **Gauss and Competition Exclusion Principle**:
- Gauss is known for the competition exclusion principle, which states that two species competing for the same limited resources cannot coexist. This principle highlights the competitive interactions but does not explain resource partitioning.

4. **MacArthur and Resource Partitioning**:
- MacArthur is the scientist who studied resource partitioning. He provided examples of how closely related species, such as warblers, can coexist by utilizing different resources or foraging in different ways.

5. **Cornell's Contributions**:
- Cornell conducted experiments on barnacles and demonstrated competitive exclusion, but he is not associated with the concept of resource partitioning.

6. **Ellen's Contributions**:
- Ellen is not known for any significant contributions related to resource partitioning or competition.

7. **Conclusion**:
- Based on the information, the scientist who showed resource partitioning is MacArthur.

### Final Answer:
Resource partitioning was shown by **MacArthur**.