<?xml version='1.0' encoding='utf-8'?>
<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:contributor>Li Zidong</dc:contributor>
  <dc:contributor>Tomoyuki Kado</dc:contributor>
  <dc:contributor>Yoshihiko Tsumura</dc:contributor>
  <dc:contributor>Beth A. Middleton</dc:contributor>
  <dc:contributor>Hidenori Tachida</dc:contributor>
  <dc:creator>Junko Kusumi</dc:creator>
  <dc:date>2010</dc:date>
  <dc:description>&lt;p&gt;•&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Premise of the Study:&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;Studies of the geographic patterns of genetic variation can give important insights into the past population structure of species. Our study species,&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Taxodium distichum&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;L. (bald‐cypress), prefers riparian and wetland habitats and is widely distributed in southeastern North America and Mexico. We compared the genetic variation of&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;T. distichum&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;with that of its close relative,&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Cryptomeria japonica&lt;/i&gt;, which is endemic to Japan.&lt;/p&gt;&lt;p&gt;•&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Methods:&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;Nucleotide polymorphisms of&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;T. distichum&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;in the lower Mississippi River alluvial valley, USA, were examined at 10 nuclear loci.&lt;/p&gt;&lt;p&gt;•&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Key Results:&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;The average nucleotide diversity at silent sites, π&lt;sub&gt;sil&lt;/sub&gt;, across the 10 loci in&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;T. distichum&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;was higher than that of&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;C. japonica&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;(π&lt;sub&gt;sil&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;= 0.00732 and 0.00322, respectively). In&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;T. distichum&lt;/i&gt;, Tajima's&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;D&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;values were each negative at 9 out of 10 loci, which suggests a recent population expansion. Maximum‐likelihood and Bayesian estimations of the exponential population growth rate (&lt;i&gt;g&lt;/i&gt;) of&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;T. distichum&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;populations indicated that this species had expanded approximately at the rate of 1.7–1.0 × 10&lt;sup&gt;–6&lt;/sup&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;per year in the past.&lt;/p&gt;&lt;p&gt;•&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Conclusions: Taxodium distichum&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;had significantly higher nucleotide variation than&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;C. japonica&lt;/i&gt;, and its patterns of polymorphism contrasted strikingly with those of the latter, which previously has been inferred to have experienced a reduction in population size.&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.3732/ajb.1000082</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Botanical Society of America</dc:publisher>
  <dc:title>Multilocus patterns of nucleotide polymorphism and demographic change in Taxodium distichum (Cupressaceae) in the lower Mississippi River alluvial valley</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>