Which isolation occurs when species occupy different habitats and rarely meet?

Which isolation occurs when species occupy different habitats and rarely meet?

• A. Prezygotic Barrier
• B. Postzygotic Barrier
• C. Mechanical Isolation
• D. Ecological Isolation

Answer: (D)

When two species live in different habitats within the same area, they rarely encounter each other and thus rarely mate. This is ecological isolation, a prezygotic barrier that reduces gene flow by limiting encounters before any fertilization can occur. It’s more specific than the broader prezygotic category because it focuses on where the organisms live and how that limits mating, rather than on when mating occurs or what happens after fertilization. Other barriers describe different ways isolation can arise—mechanical isolation involves incompatible mating structures, and postzygotic barriers affect the viability or fertility of offspring after mating.

When two species live in different habitats within the same area, they rarely encounter each other and thus rarely mate. This is ecological isolation, a prezygotic barrier that reduces gene flow by limiting encounters before any fertilization can occur. It’s more specific than the broader prezygotic category because it focuses on where the organisms live and how that limits mating, rather than on when mating occurs or what happens after fertilization. Other barriers describe different ways isolation can arise—mechanical isolation involves incompatible mating structures, and postzygotic barriers affect the viability or fertility of offspring after mating.