What historical process, distinct from dispersal, has likely played a major role in establishing the major clades of the Sphaerodactylus genus?
Answer
Vicariance events
Vicariance refers to the geographical separation of a population, typically by a physical barrier such as rising sea levels or the formation of new islands. Unlike dispersal, where animals move to new territory, vicariance splits an existing population, forcing the isolated groups to evolve independently. These ancient geological events were instrumental in shaping the deep-time divergence patterns observed in the genus, explaining how closely related species ended up on different, separated islands.
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