Character Displacement
Updated 2026-08-08
INTRODUCTION
English translation pending.
CORE DEFINITION
Character displacement describes the pattern in which two closely related species that compete for the same resources evolve greater differences in the traits used to obtain them, such as beak size, where their ranges overlap. In regions where only one species occurs, the traits remain closer to the ancestral form. The divergence reduces resource overlap and thus competition, and demonstrating it requires ruling out alternative explanations such as climate or phylogenetic history.
SCAFFOLDING EFFECT
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- Compare the ranges: check whether traits differ more where the two competitors coexist than where they do not. - Look for the overlap: identify which shared resource the divergence is reducing competition over. - Differentiate deliberately: when a rival enters, specialize rather than compete head-on.
Anchor fast decisions
Individuals whose resource use overlaps most with the competitor obtain less food, so they leave fewer offspring. Selection therefore favours variants that use slightly different resources, and over generations the population shifts away from the overlap. The shift is strongest where the two species coexist, since that is where competition is most intense.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Character_displacementverified
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