EEB362H1 Lecture Notes - Lecture 9: Allopatric Speciation, Sister Group, Species Richness

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Radiation species of program starts when people look at things at wonder why there are so many species: ray-finned fish, flowering plants, perching birds. Often hear people say (cid:498)the ray-finned fish are the most diverse (species-rich(cid:524) vertebrate group(cid:499: ~30 000 species. How did they know that: well maybe they looked at the number of snakes and there were only 3000 species and so they thought ray-finned fish had a lot more species than snakes. But ray-finned fish are 400 million years old and snakes are only 95 million years old. Ray-finned fish had much longer time to speciate than snakes. So not surprising that they have more species. Can(cid:495)t just grab random vertebrate group for comparison. So have to compare sister groups to control for age. Lobe-finned fish (snakes, amphibians, mammals, reptiles etc. ) Observation: 2 obvious groups: 1 has 323 species, 1 has 12000 species. Has the species-rich group (group a) undergone a radiation.

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