BIO120H1 Lecture Notes - Lecture 9: Species, Ecological Speciation, Species Problem
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BIO120H1 Full Course Notes
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Honeycreeper phylogeny: descended from a single species of finch in last 10 million years. Ernest myer: group of interbreeding populations that are reproductively isolated from other groups . If found in diff environments, can come back later and interbreed. If they can interbreed, they are same species. Jerry coyne and allan orr: without speciation, we"d form single species, due to isolation, we have natural diversification in diff directions. Biological species concept: focuses on process, geographic isolation alone is not sufficient, can come back later and interbreed. Isolation does not have to be absolute (cutoff: aren"t neanderthals diff species, how can they interbreed with humans, there will be intermediate stages where they can interbreed, must be interbreeding in the wild. If force mates in lab, it doesn"t mean in the wild they are same species: does not work well for bacteria, asexuals, highly self-fertilizing species, bacteria do not interbreed.
