Guase's Competitive Exclusion Principle states that two species cannot coexist indefinitely in the same niche .
Niche is defined as the total interaction of a species with its environment or the relational functional position or status of a species or population in its ecosystem .
Ecological niche depends upon the species structural adaptations ,physical response and behavior .
The ecological niche describes how an organism or population responds to the distribution of resources and competitors .
This principle states that two closely related species competing for the same resources cannot co-exist indefinitely .
Competitively the inferior one get eliminated eventually , e.g., when two species of paramecium are kept together in one habitat for long time ,it was observed that one gets eliminated .
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