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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>Jacklyn Rodriguez</dc:contributor>
  <dc:contributor>Pietra G. Mueller</dc:contributor>
  <dc:contributor>Stephen T. Jackson</dc:contributor>
  <dc:contributor>Surangi W. Punyasena</dc:contributor>
  <dc:creator>Luke Mander</dc:creator>
  <dc:date>2014</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;Late Quaternary fluvial deposits in the Tunica Hills region of Louisiana and Mississippi are rich in spruce macrofossils of the extinct species&amp;nbsp;&lt;/span&gt;&lt;i&gt;Picea critchfieldii&lt;/i&gt;&lt;span&gt;, the one recognized plant extinction of the Late Quaternary. However, the morphology of&amp;nbsp;&lt;/span&gt;&lt;i&gt;P. critchfieldii&lt;/i&gt;&lt;span&gt;&amp;nbsp;pollen is unknown, presenting a barrier to the interpretation of pollen spectra from the last glacial of North America. To address this issue, we undertook a morphometric study of&amp;nbsp;&lt;/span&gt;&lt;i&gt;Picea&lt;/i&gt;&lt;span&gt;&amp;nbsp;pollen from Tunica Hills. Morphometric data, together with qualitative observations of pollen morphology using Apotome fluorescence microscopy, indicate that&amp;nbsp;&lt;/span&gt;&lt;i&gt;Picea&lt;/i&gt;&lt;span&gt;&amp;nbsp;pollen from Tunica Hills is morphologically distinct from the pollen of&amp;nbsp;&lt;/span&gt;&lt;i&gt;P. glauca&lt;/i&gt;&lt;span&gt;,&amp;nbsp;&lt;/span&gt;&lt;i&gt;P. mariana&lt;/i&gt;&lt;span&gt;&amp;nbsp;and&amp;nbsp;&lt;/span&gt;&lt;i&gt;P. rubens&lt;/i&gt;&lt;span&gt;. Measurements of grain length, corpus width and corpus height indicate that&amp;nbsp;&lt;/span&gt;&lt;i&gt;Picea&lt;/i&gt;&lt;span&gt;&amp;nbsp;pollen from Tunica Hills is larger than the pollen of&amp;nbsp;&lt;/span&gt;&lt;i&gt;P. mariana&lt;/i&gt;&lt;span&gt;&amp;nbsp;and&amp;nbsp;&lt;/span&gt;&lt;i&gt;P. rubens&lt;/i&gt;&lt;span&gt;, and is slightly larger than&amp;nbsp;&lt;/span&gt;&lt;i&gt;P. glauca&lt;/i&gt;&lt;span&gt;&amp;nbsp;pollen. We argue that the morphologically distinctive Tunica Hills&amp;nbsp;&lt;/span&gt;&lt;i&gt;Picea&lt;/i&gt;&lt;span&gt;&amp;nbsp;pollen was probably produced by the extinct spruce species&amp;nbsp;&lt;/span&gt;&lt;i&gt;P. critchfieldii&lt;/i&gt;&lt;span&gt;. These morphological differences could be used to identify&amp;nbsp;&lt;/span&gt;&lt;i&gt;P. critchfieldii&lt;/i&gt;&lt;span&gt;&amp;nbsp;in existing and newly collected pollen records, which would refine its paleoecologic and biogeographic history and clarify the nature and timing of its extinction in the Late Quaternary.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1002/jqs.2745</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Published for the Quaternary Research Association [by] Longman</dc:publisher>
  <dc:title>Identifying the pollen of an extinct spruce species in the Late Quaternary sediments of the Tunica Hills region, south-eastern United States</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>