Question

Two closely related species can co-exist indefinitely and violate Gause’s ‘Competitive Exclusion Principle’ by:

• A. Eliminating the inferior species.
• B. Resource partitioning.
• C. Interacting with each other symbiotically.
• D. Changing the area of grazing.

Answer 1

The Correct Option is B

Two closely related species can co-exist indefinitely and violate Gause’s ‘Competitive Exclusion Principle’ through a process called resource partitioning. 

Gause's Principle states that two species competing for the exact resources cannot stably coexist if other ecological factors remain constant. However, species can avoid this direct competition by dividing resources and utilizing them in different ways. This strategy, known as resource partitioning, allows them to coexist without direct competition for the same resources.

Here's how resource partitioning works:

• Different Resources: Each species uses a different set of resources to reduce direct competition.
• Temporal Separation: Species utilize the same resource but at different times, avoiding overlap.
• Spatial Separation: Different species occupy separate habitats or areas to minimize direct competition.
• Morphological Adaptations: Physical adaptations can lead to different feeding techniques or preferences, allowing coexistence.

Thus, resource partitioning enables species to reduce direct competition and co-exist over a long period, overcoming the limitations of Gause’s Principle.

Answer 2

Understanding Gause’s Competitive Exclusion Principle

Gause’s Competitive Exclusion Principle states that two species competing for the same limited resource cannot coexist indefinitely. One species will eventually outcompete the other, leading to the extinction of the less competitive species in that habitat.

Resource Partitioning as a Mechanism for Co-existence

Resource partitioning allows closely related species to co-exist by reducing direct competition for the same resources. This can be achieved through:

• Temporal Partitioning: Species use the same resources but at different times. For example, one species might feed during the day while the other feeds at night.
• Spatial Partitioning: Species occupy different microhabitats within the same area. For example, one species might live in the canopy of trees while the other lives on the forest floor.
• Functional Partitioning: Species use the same resources but in different ways. For example, one species might prefer smaller prey while the other prefers larger prey.

Example of Resource Partitioning

A classic example of resource partitioning is seen in Darwin’s finches on the Galápagos Islands. These closely related species co-exist by specializing in different types of food. Some finches have beaks adapted for cracking hard seeds, while others have beaks suited for eating insects or fruit.

Conclusion

By partitioning resources, closely related species can reduce direct competition and co-exist indefinitely, thereby violating Gause’s Competitive Exclusion Principle.