EEB362H1 Lecture Notes - Lecture 6: Convergent Evolution, Swim Bladder, Orthogenesis
2 Feb 2018
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Different foraging modes in lizards but different genealogical relationships. Now we have phylogenetic tree: when we optimize here we get eating lizards is plesiomorphic. Evolutionary convergence: = parallelism, you know you have convergence when, (1) you get the appearance of 2 traits that seem to be the same but aren"t homologous, appear independently = not common ancestry, this is the pattern. Independent origins: (2) but it has to originate for the same reason = same process, this is what true evolutionary convergence is, has to be same reason why trait originated. The whole background will look blue at coral reefs. In freshwater temperate ecosystem, there are diff things in water that absorb diff wavelengths of light. In 1 the habitat is blue, in the other the habitat is green. Hypothetical example of body colour: some are green some are blue, when optimize, we get green body colour as plesiomorphic, blue body has shown up convergent 3 times.
