If the pioneer stage is dominated by autotrophs, then the succession is called.

Options

A. Allogenic
B. Autogenic
C. Autotrophic
D. Heterotrophic

Answer

To solve the question, "If the pioneer stage is dominated by autotrophs, then the succession is called," we need to analyze the options provided and understand the definitions of each term related to ecological succession.

### Step-by-Step Solution:

1. **Understand the Concept of Ecological Succession**: Ecological succession is the process by which ecosystems change and develop over time. It can be initiated by various factors and can be classified into different types based on the dominant organisms present during the pioneer stage.

2. **Identify the Types of Succession**:
- **Allogenic Succession**: This type of succession is driven by abiotic factors, such as climate and soil changes. It does not primarily involve living organisms.
- **Autogenic Succession**: This succession is driven by biotic factors, meaning it is influenced by the organisms within the ecosystem itself.
- **Autotrophic Succession**: This type of succession occurs when autotrophs, such as green plants, dominate the pioneer stage. Autotrophs are organisms that produce their own food through photosynthesis or chemosynthesis.
- **Heterotrophic Succession**: This succession involves organisms that depend on other organisms for food, such as animals, bacteria, and fungi.

3. **Analyze the Given Condition**: The question states that the pioneer stage is dominated by autotrophs. This indicates that the initial organisms involved in the succession are those that can produce their own food.

4. **Select the Correct Answer**: Since the pioneer stage is dominated by autotrophs, the correct term for this type of succession is **autotrophic succession**.

### Final Answer:
The succession is called **autotrophic succession**.

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