Researchers revise Darwin's thinking on invasive species

For more than a century and a half, researchers interested in invasive species have looked to Charles Darwin and what has come to be called his "naturalization conundrum." If an invader is closely related to species in a new area, he wrote in his landmark The Origin of Species, it should find a more welcoming habitat. On the other hand, it could expect competition from the related species and attacks from its natural enemies like predators and parasites.

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