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A species of seagulls exists as a large number of population on islands of the Azores archipelago. During a storm, two males and two females are blown 300 miles due West, to an isolated island uninhabited by seagulls (Survivor Island). They reproduce forming a new population. They cannot disperse back to the original habitat, nor can any new seagulls cross to the new island. Over the course of the next 200 years, these Survivor Island gulls evolved mating displays that differ from those of the parent population. When television producers introduce the original Azores archipelago gulls to the island, the two kinds of gulls find each other’s mating behavior objectionable and do not interbreed.
What type of isolation mechanism keeps the two species of gulls from interbreeding? What type of evolutionary event has occurred?