Community Ecology

AP Biology· difficulty 3/5

Two species occupy partially overlapping fundamental niches.

Species A niche Species B niche Overlap region

According to the competitive exclusion principle, the most likely outcome is:

  • A

    Both species occupy identical niches indefinitely

  • B

    They form a mutualistic relationship

  • C

    Both species go extinct

  • D

    One species is competitively excluded or both shift to realized niches

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Explanation

Gause's competitive exclusion principle states that two species with identical niches cannot coexist; one will be excluded or character displacement / niche shift will reduce overlap.

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