If a new habitat is just being colonised, contribution of which of the following is more significant in the increase in population density?

Options

A. 1)Natality
B. 2)Immigration
C. 3)Emigration
D. 4)Mortality

Answer

To solve the question of which factor contributes more significantly to the increase in population density in a newly colonized habitat, we can break down the options provided and analyze their roles in population dynamics.

### Step-by-Step Solution:

1. **Understanding Population Density**:
- Population density refers to the number of individuals of a species per unit area. An increase in population density can occur through two main processes: an increase in births (natality) and an influx of individuals from other areas (immigration).

2. **Analyzing the Options**:
- **Option 1: Natality** (Birth Rate)
- Natality refers to the birth rate of a population. In a newly colonized habitat, the initial population may not have a significant number of individuals reproducing yet, as the habitat is just being established. Therefore, the contribution of natality to increasing population density is likely to be low at this stage.

- **Option 2: Immigration**
- Immigration is the movement of individuals into a population from other areas. In a newly colonized habitat, immigration can significantly contribute to increasing population density as individuals from surrounding areas may move in to take advantage of the new resources available.

- **Option 3: Emigration**
- Emigration refers to individuals leaving a population. This would lead to a decrease in population density, not an increase. Hence, this option is not relevant for the question.

- **Option 4: Mortality**
- Mortality refers to the death rate within a population. Similar to emigration, high mortality would lead to a decrease in population density, making this option incorrect as well.

3. **Conclusion**:
- Based on the analysis, the most significant contributor to the increase in population density in a newly colonized habitat is **immigration**. Therefore, the correct answer is **Option 2: Immigration**.