BI111 Chapter Notes - Chapter 72: Niles Eldredge, Punctuated Equilibrium, Phyletic Gradualism
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Depe(cid:374)ds o(cid:374) i(cid:374)tera(cid:272)tio(cid:374)s (cid:271)/(cid:449) pop"s ge(cid:374)o(cid:373)e & e(cid:374)(cid:448)io. Speciation: evolutionary process where pop diverge to form new species. Speciation of beetles likely much faster than elephants. Misconceptions by speciation: species evolve toward predetermined form or grater complexity but evolution does not have end goal. No goal of achieving greater complexity in this process. If greater complexity/simplicity enhances reproductive fitness, selection will favor it: some species we see today evolved from other species seen today. Modern species may share common ancestor but they do not stop evolving once they have split from cousins. Hu(cid:373)a(cid:374)s did (cid:374)ot evolve fro(cid:373) (cid:272)hi(cid:373)pa(cid:374)zee"s or (cid:271)o(cid:374)o(cid:271)os: pare(cid:374)t spe(cid:272)ies do (cid:374)ot (cid:862)disappear(cid:863) might go extinct. Punctuated equilibrium challenged as non- evolutionary causes explained the patterns observed. However, evidence found later proved real this was real pattern of evolution. Formation of new species a genetic event- estimate speciation rates. Ros varied group to group some faster than others. Role of ecology food supply & temperature on body size.
