Niche and Organism
In nature, it is common for multiple species to inhabit the same habitat, yet each species carries out distinct roles or functions. The specific functional role or behaviour of a species within its habitat is called its niche.
To understand the difference clearly:
- A habitat can be considered the “address” of a species—where it lives.
- A niche, on the other hand, is like its “profession”—the set of activities and interactions through which it utilizes the habitat’s resources for survival, growth, and reproduction.
The niche includes everything that a species does—how it feeds, how it responds to predators, how it competes or cooperates with others, and how it modifies or uses the environment.
- Each species has a unique niche, even if they share the same habitat. No two species in the same habitat can occupy identical niches for long. If that happens, they will compete directly with each other, and eventually, one species will be eliminated or displaced due to competitive exclusion.
- For example, several insect species may act as pests on the same plant, but they are able to co-exist because they feed on different parts of the plant (such as leaves, roots, or flowers). This division of resource use ensures niche differentiation and minimizes direct competition.
- Another excellent example of niche differentiation can be observed in a forest ecosystem. Forests are capable of supporting a large number of plant species because these species occupy different ecological niches based on their structure and resource needs.
In a forest, plants of varying heights such as tall trees, short trees, shrubs, bushes, and grasses coexist. Although they share the same habitat, they do not compete directly for resources like sunlight and nutrients, because each occupies a different vertical space within the ecosystem.
- Tall trees form the canopy and capture sunlight at higher levels.
- Short trees and shrubs occupy the understory, making use of filtered light.
- Grasses and herbs thrive near the forest floor, adapted to low light conditions.
This stratification enables multiple plant species to survive and flourish together, utilizing resources from the same habitat in different ways, thus minimizing competition and promoting biodiversity.
The most important resources in the niches of animals are food and shelter while in case of plants, they are moisture and nutrients (phosphorous and nitrogen). The Ecological Niche of Human being is given below:
