This higher tier covers Higher Competitive Exclusion and Niche Differentiation within Competition Adaptations for GCSE Biology. Topic 2: Competition Adaptations It is section 12 of 15 in this topic. This section is most useful once the core foundation idea is secure, because it adds the detail that pushes answers higher.
Higher Competitive Exclusion and Niche Differentiation
When two species compete for exactly the same resources in the same niche, one will eventually out-compete the other, driving it locally extinct. This is Gause's competitive exclusion principle. In practice, species that appear to compete rarely occupy identical niches — close examination reveals subtle differences in what they eat, when they feed, or where they forage. These differences, shaped by natural selection over generations, reduce competition enough for coexistence. This is called niche differentiation or resource partitioning.
Example: Three warbler species in North American spruce forests appear to compete for the same insects, but each feeds in a different vertical zone of the tree — one near the top, one in the middle, one near the bottom. This partitioning reduces interspecific competition, allowing all three species to coexist.
Practice questions for Competition Adaptations
Which of the following do plants compete for?
Explain how the spines of a cactus are an adaptation to its desert environment.