Competition occurs when resources are not present in adequate amounts to satisfy the needs of all the individuals who depend on these sources.
Intraspecific Competition
This occurs between individuals of the same species. When factors, like food supplies, become a limiting factor, individuals are competing for resources. Those best adapted will reproduce.
The stationary phase is usually very stable, with only small fluctuations, This is because of competition:
- If the population size decreases, competition decreases so the population size increases again, and vice versa.
Interspecific Competition
This occurs when individuals of different species compete. This can effect both population size and distribution of a species in an ecosystem.
Competitive Exclusion Principle: when two species have exactly the same niche so one species dies out eg. Red squirrels and grey squirrels.
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