theory of vicariance
Quick Summary
The theory of vicariance in biology proposes that species are formed when a barrier develops, splitting a widespread population into isolated subpopulations. This fragmentation of the environment, rather than dispersal, is seen as a primary driver of evolutionary diversification.12
For example, the movement of tectonic plates has significantly influenced biogeographic patterns. As continents drift and break apart, they create new barriers that can lead to the isolation and subsequent speciation of organisms. This process is contrasted with dispersal, where species spread to new areas. While both mechanisms contribute to distribution patterns, vicariance is often considered the underlying framework for much of this diversity.342
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biogeographic regionDispersalist and vicariance biogeographyWithin historical biogeography, two viewsâthe dispersalist and vicariance hypotheses of biotic distribution patternsâhave been at odds. According to the dispersalist view, speciation occurs as animals spread out from a centre of origin, crossing preexisting barriers that they would not readily recross and thatâŠ
Read MoreWithin historical biogeography, two viewsâthe dispersalist and vicariance hypotheses of biotic distribution patternsâhave been at odds. According to the dispersalist view, speciation occurs as animals spread out from a centre of origin, crossing preexisting barriers that they would not readily recross and thatâŠ
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marine ecosystemDistribution and dispersalVicariance theory argues that plate tectonics has a major role in determining biogeographic patterns (see biogeographic region: Dispersalist and vicariance biogeography). For example, Australia was onceâ90 million years agoâclose to the South Pole and had few coral reefs. Since then Australia has
Read MoreVicariance theory argues that plate tectonics has a major role in determining biogeographic patterns (see biogeographic region: Dispersalist and vicariance biogeography). For example, Australia was onceâ90 million years agoâclose to the South Pole and had few coral reefs. Since then Australia has
Read More