Vicariance
분단분포
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<speciesfyi-glossary slug="vicariance"></speciesfyi-glossary>Definition
The separation of a population into geographically isolated groups by a physical barrier, leading to independent evolution.
Detailed Explanation
Vicariance was historically the dominant model for explaining disjunct distributions — the formation of the Atlantic Ocean explains why some South American and African species are sister taxa. Modern biogeography integrates vicariance and dispersal, recognizing both processes contribute to distribution patterns. Molecular phylogenetics can date splits and compare them with geological events to determine whether vicariance or dispersal better explains a particular distribution.