With reference to community ecology, which one of the following describes a cluster of different species of vines climbing into the canopy of a tropical forest ?

Options

A. Ecological eqivalents
B. Guilds
C. Edge species
D. Ecotypes

Explanation

To answer the question regarding community ecology and the description of a cluster of different species of vines climbing into the canopy of a tropical forest, we will analyze each of the provided options step by step.

### Step-by-Step Solution:

1. **Understanding the Question**:
- The question asks for a term that describes a group of different species of vines that are climbing into the canopy of a tropical forest. This indicates that we are looking for a term that relates to multiple species interacting within the same habitat.

2. **Analyzing the Options**:
- **Option 1: Ecological Equivalents**:
- This term refers to unrelated organisms that occupy similar habitats and resemble each other. Since we are discussing a cluster of different species of vines, this term does not apply.

- **Option 2: Guilds**:
- A guild is a group of species that exploit the same resource or exploit different resources in related ways. Since the vines are climbing into the same canopy and likely competing for light and space, this term fits well.

- **Option 3: Edge Species**:
- Edge species are those that are evolutionary distinct and globally endangered. This term does not relate to a cluster of vines in the canopy, so it is not applicable.

- **Option 4: Ecotypes**:
- Ecotypes are subpopulations that are genetically differentiated and restricted to a specific habitat. While this term relates to genetic differences, it does not specifically describe a cluster of different species.

3. **Conclusion**:
- Based on the definitions and the context of the question, the best answer is **Option 2: Guilds**. This term accurately describes a cluster of different species of vines that share the same habitat and resources in the canopy of a tropical forest.

### Final Answer:
The correct answer is **Guilds**.