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Evolutionary biogeography on Mexico's Baja California peninsula: A synthesis of molecules and historical geology.

Baja California is the second longest and most geographically isolated peninsula in the world. Over the last 4–5 million years, it has undergone a uniquely complex tectonic origin and ecological transformation. What we see today as a rugged, isolated peninsula originally was connected to the west coast of mainland Mexico but became torn away by differential movements of the Pacific and North American plates. Since then, it has rifted approximately 300 km to the northwest along what has become known as the San Andreas Fault. This separation occurred in various stages of uplift, submergence, and geographical fragmentation, leaving the peninsula an archipelago at times. This dynamic environmental history has had a profound effect on the evolution, distribution, and genetic structuring of Baja California's terrestrial vertebrates.