Habitats

What Is a Habitat?

A habitat is the physical environment in which an organism lives. It includes the features of the environment that allow an organism to survive, such as available food, water, shelter, space, temperature, and other environmental conditions.

A habitat is not simply a location on a map. Two places may both be described as forests, for example, but they can have very different conditions. One forest might be warm and wet with dense vegetation, while another might be colder, drier, and more open.

What matters to an organism is whether the environment provides the conditions and resources that organism requires.

Biotic and Abiotic Factors

Every habitat contains both biotic and abiotic factors. These factors can influence whether a particular environment is suitable for an organism.

A Habitat Is More Than a Place

It is tempting to define a habitat simply as “where an organism lives.” That is a useful starting point, but ecologists are also interested in the environmental conditions and resources that make that location suitable for an organism.

Consider a frog living near a pond. The pond is a location, but the frog's habitat also includes the water it needs, nearby vegetation that provides shelter, appropriate temperatures, available food, and other conditions that allow it to survive.

Habitats Can Be Large or Small

Habitats can be described at many different scales. A habitat may be a large environment, such as a forest, or it may be a much smaller part of that environment.

A small, specialized portion of a larger habitat is sometimes called a microhabitat. A microhabitat may have conditions that differ from the surrounding environment.

Habitat vs. Niche

One of the most important distinctions in ecology is the difference between a habitat and a niche.

Two species may live in the same habitat while using different resources, occupying different locations, eating different foods, or interacting with other organisms in different ways. Therefore, sharing a habitat does not mean that two species have identical niches.

Continue with Fundamental Niche and Realized Niche to explore this distinction further.

Habitats Change

Habitats are not static. Temperature, water availability, food resources, vegetation, predators, competitors, and other environmental conditions can change over time.

When environmental conditions change, an organism may have more difficulty surviving in that habitat. A change does not necessarily affect every species in the same way because different organisms have different requirements.

This is one reason that understanding a habitat requires looking at both the organism and its environment.

Habitats and Limiting Factors

Some conditions or resources can restrict the ability of organisms to survive and reproduce. These are called limiting factors.

For example, a population may have plenty of space but very little available water. In that situation, water availability could limit population growth. Another species might be affected more strongly by temperature, food availability, or competition.

Learn more in Limiting Factors and Carrying Capacity.

Habitats and Communities

A habitat is home to organisms, but those organisms do not exist independently. They interact with other species through predation, competition, mutualism, and other relationships.

These interactions help shape the biological conditions of a habitat and can influence where organisms are able to survive.

Continue with Community Interactions and Ecological Levels of Organization.

Common Misconceptions

If You See This on a Test, Think This

Quick Practice