https://wiki.cas-group.net/index.php?action=history&feed=atom&title=Punctuated_equilibrium 2026-07-19T17:15:21Z Revision history for this page on the wiki MediaWiki 1.43.8 https://wiki.cas-group.net/index.php?title=Punctuated_equilibrium&diff=930&oldid=prev 2010-05-15T15:34:26Z

<p></p> <table style="background-color: #fff; color: #202122;" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr class="diff-title" lang="en"> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 10:34, 15 May 2010</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1">Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td></tr> <tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">'''Punctuated equilibrium''' is a concept proposed by Stephen Jay Gould and Niles Eldredge in 1972. The basic idea is that evolution over very long time spans tends to be characterized by long periods of equilibrium - where little evolutionary change happens - punctuated by rare moments of rapid changes. It is based on the observation of paleontologists that many basic species can persist for millions of years without any significant morphological changes.</ins></div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">'''Punctuated </del>equilibrium<del style="font-weight: bold; text-decoration: none;">''' </del>is a <del style="font-weight: bold; text-decoration: none;">concept proposed </del>by <del style="font-weight: bold; text-decoration: none;">Stephen Jay Gould and Niles Eldredge in 1972. The basic </del>idea <del style="font-weight: bold; text-decoration: none;">is </del>that evolution <del style="font-weight: bold; text-decoration: none;">over very long time spans tends to be characterized </del>by long periods of <del style="font-weight: bold; text-decoration: none;">equilibrium - where little </del>evolutionary <del style="font-weight: bold; text-decoration: none;">change happens - </del>punctuated by rare <del style="font-weight: bold; text-decoration: none;">moments </del>of rapid changes.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">The idea of punctuated </ins>equilibrium <ins style="font-weight: bold; text-decoration: none;">can hardly be called a theory, because it </ins>is <ins style="font-weight: bold; text-decoration: none;">only </ins>a <ins style="font-weight: bold; text-decoration: none;">single idea already captured </ins>by <ins style="font-weight: bold; text-decoration: none;">the name: the </ins>idea that evolution <ins style="font-weight: bold; text-decoration: none;">is marked </ins>by long periods of evolutionary <ins style="font-weight: bold; text-decoration: none;">stability, which is </ins>punctuated by rare <ins style="font-weight: bold; text-decoration: none;">instances </ins>of rapid changes<ins style="font-weight: bold; text-decoration: none;">.  Gould and Eldredge proposed nothing more and nothing less. Unfortunately they did not develop any theory which is more complex than this single idea</ins>.</div></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br></td></tr> <tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Links ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Links ==</div></td></tr> </table>

Jfromm https://wiki.cas-group.net/index.php?title=Punctuated_equilibrium&diff=929&oldid=prev 2010-05-15T15:20:23Z

<p>Created page with &#039; &#039;&#039;&#039;Punctuated equilibrium&#039;&#039;&#039; is a concept proposed by Stephen Jay Gould and Niles Eldredge in 1972. The basic idea is that evolution over very long time spans tends to be charac...&#039;</p> <p><b>New page</b></p><div><br /> &#039;&#039;&#039;Punctuated equilibrium&#039;&#039;&#039; is a concept proposed by Stephen Jay Gould and Niles Eldredge in 1972. The basic idea is that evolution over very long time spans tends to be characterized by long periods of equilibrium - where little evolutionary change happens - punctuated by rare moments of rapid changes.<br /> <br /> == Links ==<br /> <br /> * Wikipedia entry for [http://en.wikipedia.org/wiki/Punctuated_equilibrium punctuated equilibrium]<br /> * Scholarpedia entry for [http://www.scholarpedia.org/article/Punctuated_equilibria punctuated equilibrium]<br /> <br /> [[Category:Evolutionary Principles]]</div>

Jfromm