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Phyletic gradualism and punctuated equilibria are really two different modes where evolution can take place. Punctuated equilibria, many different kinds of species can differentiate very quickly resulting evolving to a new environment. Once species are established they vary very little over time. An older theory is phyletic gradualism; this has been actually discarded in biology. This is a steady and slow rate of change in population over time. The differences between the two are the rate of evolution. Phyletic gradualism is very slaw and is constant for species. In punctuated equilibrium the rate is very fast and is related to geologically side of things. In my opinion, the differences lay in the definitions of the species and of course the theories behind punctuated equilibrium and phyletic gradualism. Many expert and researchers have annotated that punctuated equilibrium implies a prediction about patterns of genetic differences among many species. It predicts that many evolutionary changes takes place in a short span of time and is tied to speciation events.” Punctuated equilibrium predicts that the fossil record at any one site is unlikely to record the process of speciation. If a site records that the ancestral species lived there, the new species would probably be evolving somewhere else. The small size of the isolated population which is evolving into a new species reduces the odds that any of its members will be fossilized. The new species will only leave fossils at the same site as the old one if it becomes successful enough to move back into its ancestral range or different enough to exist alongside its relatives” (Evolution: Library: Punctuated Equilibrium, n.d., p. xx-xx).

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