Biological diversity is enhanced through human movement from "summary" of The Next Great Migration by Sonia Shah
Human movement has long been a driver of biological diversity. When humans set out from Africa some 60,000 years ago, they carried with them a suite of plant and animal species that would become the basis of agriculture in their new lands. As they colonized the world, humans deliberately transported their favorite species—rice, wheat, and cattle, among others, which they used to transform the ecologies they encountered, altering habitats and creating new niches that encouraged diversity. Humans also inadvertently carried with them species that would become invasive, outcompeting native ones and sometimes driving them to extinction. But even as humans contributed to the extinction of some species, they helped to diversify others by inadvertently creating new habitats that favored the survival of certain species over others. In this way, human migration has shaped the diversity of life on Earth, often in unexpected ways. ...
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