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ozbird 发表于 26-7-2013 14:51
看来你还是没看明白我前面说的呀。说你观察不到，是因为你所想象的观察本身就是个完全错误的理解。你对 ...
https://en.wikipedia.org/wiki/Punctuated_equilibrium
Punctuated equilibrium (also called punctuated equilibria) is a theory in evolutionary biology which proposes that most species will exhibit little net evolutionary change for most of their geological history, remaining in an extended state called stasis. When significant evolutionary change occurs, the theory proposes that it is generally restricted to rare and rapid (on a geologic time scale) events of branching speciation called cladogenesis. Cladogenesis is the process by which a species splits into two distinct species, rather than one species gradually transforming into another.[1]
Punctuated equilibrium is commonly contrasted against the theory of phyletic gradualism, which states that evolution generally occurs uniformly and by the steady and gradual transformation of whole lineages (called anagenesis).In this view, evolution is seen as generally smooth and continuous. In 1972, paleontologists Niles Eldredge and Stephen Jay Gould published a landmark paper developing this theory and called it punctuated equilibria.[2] Their paper built upon Ernst Mayr's theory of geographic speciation,[3] I. Michael Lerner's theories of developmental and genetic homeostasis,[4] as well as their own empirical research.[5][6] Eldredge and Gould proposed that the degree of gradualism commonly attributed to Charles Darwin is virtually nonexistent in the fossil record, and that stasis dominates the history of most fossil species. |
楼主: ashanadsl
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发表于 26-7-2013 15:18:31
。 好像你是做IT的，咱俩同行，跟有机食品行业离得远着呢，呵呵。
,这年头,哪儿都一样
