BIOL 1001 Lecture Notes - Lecture 25: Hybrid Zone, Species Complex, Ecology
18 Jan 2016
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When two similar species re-contact: allopatry sympatric again. No: speciation has not occurred, re-homozinized into one gene pool, speciation has occurred, remain as 2 separate gene pools, the duration of the isolation, the division is permanent, need time for . Drift : rate of change is faster in small populations. Not enough divergence in the intervening time. Gene pools merge (become 1 species again: 4. When 2 sister species (=sibling species) come into contact after a period of. There is a hybrid zone between them . Where the population shows mixed traits. Hybrid zones are often found to be on the move . Hybrids usually have lower fitness if the zone is stable: pre-zygotic barriers, post-zygotic barriers. Townsend"s warblers north: black = townsend"s warblers" mtdna. Hermit warblers south: white = hermit warblers" mtdna, in the island of bc . Townsend"s phenotype + hermit warblers" mtdna this indicates that in the past, there were likely hermit.
