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<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>Yoshihisa Suyama</dc:contributor>
  <dc:contributor>Beth A. Middleton</dc:contributor>
  <dc:contributor>Yoshihiko Tsumura</dc:contributor>
  <dc:contributor>Kousuke Teshima</dc:contributor>
  <dc:contributor>Hidenori Tachida</dc:contributor>
  <dc:contributor>Junko Kusumi</dc:contributor>
  <dc:creator>Yuka Ikezaki</dc:creator>
  <dc:date>2016</dc:date>
  <dc:description>&lt;div id="sec-1" class="subsection"&gt;&lt;p id="p-1"&gt;&lt;strong&gt;PREMISE OF THE STUDY:&lt;/strong&gt; Studies of natural genetic variation can elucidate the genetic basis of phenotypic variation and the past population structure of species. Our study species, &lt;i&gt;Taxodium distichum&lt;/i&gt;, is a unique conifer that inhabits the flood plains and swamps of North America. Morphological and ecological differences in two varieties, &lt;i&gt;T. distichum&lt;/i&gt; var. &lt;i&gt;distichum&lt;/i&gt; (bald cypress) and &lt;i&gt;T. distichum&lt;/i&gt; var. &lt;i&gt;imbricarium&lt;/i&gt; (pond cypress), are well known, but little is known about the level of genetic differentiation between the varieties and the demographic history of local populations.&lt;/p&gt;&lt;/div&gt;&lt;div id="sec-2" class="subsection"&gt;&lt;p id="p-2"&gt;&lt;strong&gt;METHODS:&lt;/strong&gt; We analyzed nucleotide polymorphisms at 47 nuclear loci from 96 individuals collected from the Mississippi River Alluvial Valley (MRAV), and Gulf Coastal populations in Texas, Louisiana, and Florida using high-throughput DNA sequencing. Standard population genetic statistics were calculated, and demographic parameters were estimated using a composite-likelihood approach.&lt;/p&gt;&lt;/div&gt;&lt;div id="sec-3" class="subsection"&gt;&lt;p id="p-3"&gt;&lt;strong&gt;KEY RESULTS:&lt;/strong&gt; &lt;i&gt;Taxodium distichum&lt;/i&gt; in North America can be divided into at least three genetic groups, bald cypress in the MRAV and Texas, bald cypress in Florida, and pond cypress in Florida. The levels of genetic differentiation among the groups were low but significant. Several loci showed the signatures of positive selection, which might be responsible for local adaptation or varietal differentiation.&lt;/p&gt;&lt;/div&gt;&lt;div id="sec-4" class="subsection"&gt;&lt;p id="p-4"&gt;&lt;strong&gt;CONCLUSIONS:&lt;/strong&gt; Bald cypress was genetically differentiated into two geographical groups, and the boundary was located between the MRAV and Florida. This differentiation could be explained by population expansion from east to west. Despite the overlap of the two varieties’ ranges, they were genetically differentiated in Florida. The estimated demographic parameters suggested that pond cypress split from bald cypress during the late Miocene.&lt;/p&gt;&lt;/div&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.3732/ajb.1600046</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Botanical Society of America</dc:publisher>
  <dc:title>Inference of population structure and demographic history in &lt;i&gt;Taxodium distichum&lt;/i&gt;, a coniferous tree in North America, based on amplicon sequence analysis</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>