* Competition: The two species will compete for the same resources, such as food, water, shelter, mates, and sunlight.
* Resource Limitation: Because resources are limited, one species will be more successful at acquiring them than the other.
* Outcome: The less successful species will either:
* Be excluded: The less successful species will be forced out of the niche, leading to its decline or even extinction in that area.
* Adapt: The less successful species may adapt to use slightly different resources, leading to niche partitioning. This means they will evolve to specialize in a different part of the niche, reducing competition.
* Coexist: In some cases, both species may coexist, but with reduced population sizes compared to if they were alone. This often involves subtle differences in resource use or timing of activity.
Examples:
* Barnacles: Two species of barnacles compete for space on rocks. One species (Chthamalus) is better adapted to high tide conditions, while the other (Balanus) is better at low tide. This results in niche partitioning, where Chthamalus lives higher on the rocks, and Balanus lives lower.
* Lions and hyenas: These two predators compete for similar prey in the African savanna. They exhibit strong competition, with lions typically being more successful at securing kills. This can lead to territorial disputes and even direct confrontations.
Key Points:
* Competitive exclusion is a fundamental principle in ecology.
* It explains how species interact and how resources are distributed in an ecosystem.
* It can lead to species diversity and specialization, contributing to the complexity of natural communities.
It's important to note that competitive exclusion is not always a clear-cut process. It can be influenced by factors like environmental changes, the availability of resources, and the relative fitness of the competing species.
