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Species evolve faster in colder climates
crabsallover
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3-16-2007 2:53 AM
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science
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evolution
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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/f5896776-2df1-4b7f-8d21-a24b0ee5223b/4E290B0D-1417-42FA-BA63-AAC15A37EF58/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://christophergovanstreet.blogspot.com/2007/03/researchers-debunk-belief-species.html" href="http://christophergovanstreet.blogspot.com/2007/03/researchers-debunk-belief-species.html" style="font-size: 11px;">christophergovanstreet.blogspot.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://christophergovanstreet.blogspot.com/2007/03/researchers-debunk-belief-species.html"><H3 class="post-title"> <A href="http://richarddawkins.net/article,742,n,n">Researchers debunk belief species evolve faster in tropics</A> </H3></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://christophergovanstreet.blogspot.com/2007/03/researchers-debunk-belief-species.html"><H1> Cold is hot in evolution</H1></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://christophergovanstreet.blogspot.com/2007/03/researchers-debunk-belief-species.html">University of British Columbia researchers have discovered that contrary to common belief, species do not evolve faster in warmer climates</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://christophergovanstreet.blogspot.com/2007/03/researchers-debunk-belief-species.html">speciation – the process in which one species splits into two – takes place faster in temperate zones than in the tropics</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://christophergovanstreet.blogspot.com/2007/03/researchers-debunk-belief-species.html">It would take one species in the tropics three to four million years to evolve into two distinct species, whereas at 60 degrees latitude, it could take as little as one million years</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://christophergovanstreet.blogspot.com/2007/03/researchers-debunk-belief-species.html"><SPAN> The higher speciation rate in higher latitudes, however, is counteracted by a high extinction rate, both likely due to more intense climate fluctuations,</SPAN></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://christophergovanstreet.blogspot.com/2007/03/researchers-debunk-belief-species.html">In other words, there's a higher turnover of species in places like Canada, making it a hotbed of speciation, not the Amazon</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://christophergovanstreet.blogspot.com/2007/03/researchers-debunk-belief-species.html">charted the genetic family tree of 618 mammal and bird species in the Americas over the last several million years.</blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://christophergovanstreet.blogspot.com/2007/03/researchers-debunk-belief-species.html">explain why there are more species in general in warmer climates</blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;"> </td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/4E290B0D-1417-42FA-BA63-AAC15A37EF58/blog/" title="blog or email this clip"><img src="http://content9.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>
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