When talking about habitats, ecosystems and ecosystems in ecology and the environment ecological nicheMany people confuse these terms. While habitat, ecosystem, and niche are distinct concepts, people tend to use them in similar ways. However, each has a particular function and meaning. In this article, we will explain in detail what an ecological niche is, its differences from habitat and ecosystem, and discuss examples to illustrate these crucial ecological concepts.
What is an ecological niche of a species?
The ecological niche refers to the role or function that a species plays within a ecosystem and its relationship to the biotic environment (living things with which it interacts) and abiotic environment (non-living factors such as climate). This includes how the species obtains food, interacts with other species, and contributes to the environment in which it lives.
A classic example is that of Emperor penguin. On ecological niche He describes it as a predator in the cold waters of the ocean, hunting fish and crustaceans, and at the same time, being prey to predators such as killer whales. In addition, these animals have developed specific adaptations to survive in extremely cold environments, which highlights another characteristic of the niche: adaptation to certain physical conditions of the environment.
It is crucial to understand that the niche does not only refer to the physical location (which would be the habitat), but to the interactions that the species has with its environment and other living beings.
Shared niche and competition
The concept of shared niche It arises when two different species occupy a similar niche in the same ecosystem. In these cases, something important happens: the species enter into interspecific competition, which means they fight for the same resources, such as food or territory.
A common example is the conflict between foxes and wolves when they compete for prey in the same ecosystem. Eventually, one species will prevail, while the other may be displaced or suffer a loss of life. competitive exclusion, where a species is driven out or disappears from the ecosystem due to competition.
However, this does not always mean that exclusion is immediate. In some cases, species may specialize on different resources or adapt their behavior to minimize competition. For example, one might feed on nocturnal prey, while the other remains active during the day. This phenomenon is known as resource partitioning, and allows both species to coexist in the same ecosystem.
Same niche in different habitats
There are situations in which different but similar species share an ecological niche, but in different habitatsThese are known as vicariant species. A good example of this are the monkeys of the Old World (Africa and Asia) and those of the New World (America).
There are two main theories that explain how such similar species can live in such separate geographical locations. Dispersalism theory suggests that species can overcome geographical barriers such as mountains or oceans, colonizing new territories and evolving independently. This could give rise to new species with ecological niches similar to the original ones.
The other theory is the vicarianceAccording to this, pre-existing species are separated by geographical barriers that form over time, such as the movement of tectonic plates, giving rise to the evolution of new species in different areas. However, both maintain the same basic ecological niche.
Species that share characteristics but not territory
It is possible for two species to share similar characteristics and niches without living in the same territory. A clear example of this is the relationship between the Rhea and the ostrichThey are different animals that inhabit different geographical territories, but share a very similar ecological niche based on their ecology and feeding behavior.
However, not all species that share a niche must have similar characteristics. As we mentioned before, a brown bear and a polar bear have a common ancestor, but their evolutionary characteristics have allowed them to occupy different geographic regions without radically changing their basic niche.
Ecosystem, habitat and niche: clear differences
A concept that is frequently confused is the difference between the habitat, ecosystem y ecological niche. Habitat is the physical place where a species lives. The ecosystem is a larger system, which includes all the species and interactions in an area and the abiotic factors. On the other hand, the ecological niche describes the role that each species plays in that ecosystem, including how it uses resources and interacts with other species.
A clear example is the tropical rainforest. In this ecosystem, habitats can vary from the forest floor to the treetops. Within these habitats, each species will play its ecological role or niche. Birds might have their habitat in the treetops, while insects and amphibians might live in the foliage on the ground. Both occupy different niches within the same ecosystem.
The importance of understanding these differences lies in the need to protect these systems in order to conserve biodiversity. A healthy ecosystem with multiple ecological niches is more resilient and diverse, which provides stability to the environment we inhabit.
It is vital to note that habitat destruction can lead not only to the extinction of specific species, but also to the alleged loss of ecological niches, which negatively affects the balance of the ecosystem.
Understanding the terms ecological niche, habitat and ecosystem allows us to appreciate the complexity of nature and the importance of promoting its conservation, especially in a world where ecosystems face constant threats.