Which one of the following is the correct sequential phase in the successional development of vegetation community in a habitat ?
Migration, Reaction, Stabilization and Nudation
Migration, Nudation
Nudation, Migration, Reaction and Stabilization
Reaction, Migration, Stabilization and Nudation
Answer is Right!
Answer is Wrong!
This question was previously asked in
UPSC CDS-2 – 2019
– The typical sequential stages of succession (sometimes presented with slightly varying terminology) are:
1. **Nudation:** Creation of a bare area, devoid of any life. This can be caused by natural events like volcanic eruptions, floods, erosion, or human activities like deforestation.
2. **Invasion (or Migration):** Arrival of propagules (seeds, spores, etc.) of plants in the bare area. This involves three steps: migration (dispersal to the area), ecesis (establishment and initial growth), and aggregation (increase in number through reproduction).
3. **Competition and Co-action:** As populations grow and species interact, competition for resources (light, water, nutrients, space) occurs. Co-actions (like facilitation or inhibition) also play a role in modifying the environment.
4. **Reaction:** The organisms living in the area modify the environment (e.g., change soil composition, light availability, temperature, humidity). These changes make the habitat less suitable for the existing community but more suitable for new species. This stage drives the succession forward.
5. **Stabilization (or Climax):** Eventually, a relatively stable community develops that is in equilibrium with the environment and can reproduce itself. This is called the climax community.
– The sequence presented in option C follows the logical progression: a bare area is formed (Nudation), species arrive and establish (Migration/Invasion), organisms interact and modify the environment (Reaction), leading towards a stable state (Stabilization/Climax).