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prezygotic barrier

prevent mating or fertilization between different species

postzygotic barrier

reproductive barrier that operates should interspecies mating occur and form hybrid zygotes

temporal isolation

prezygotic barrier; when different species reproduce at different times

habitat isolation

prezygotic barrier; the species remain isolated because they breed in different habitats.

behavioral isolation

prezygotic barrier; the species have differences in mating rituals

mechanic isolation

prezygotic barrier; the species are physically unable to reproduce

hybrid inviability

postzygotic barrier; the offspring (called a hybrid) does not survive

hybrid sterility

postzygotic barrier; the hybrid is infertile

hybrid breakdown

postzygotic barrier; the first-generation hybrids are viable and fertile, but when they mate the offspring are feeble and sterile

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