<?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>Laura Perry</dc:contributor>
  <dc:contributor>Patrick B. Shafroth</dc:contributor>
  <dc:contributor>Gabrielle L. Katz</dc:contributor>
  <dc:contributor>Andrew S. Norton</dc:contributor>
  <dc:creator>Lindsay Reynolds</dc:creator>
  <dc:date>2022</dc:date>
  <dc:description>&lt;p&gt;Riparian ecosystems in the western USA have been invaded by non-native woody species deliberately introduced for stream bank stabilization, agricultural windbreaks, and urban shade. Recent work suggests that the non-native tree&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Ulmus pumila&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;(Siberian elm) is capable of significant spread in western riparian ecosystems, that range infilling is still incomplete, and that the invasion is dispersal-limited. Our objective was to understand the interacting roles of propagule pressure from upland&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;U. pumila&lt;/i&gt;, human influences, and river geomorphology in promoting riparian&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;U. pumila&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;invasion along the South Platte River, Colorado, USA. We used linear regression and information-theoretic model selection to evaluate the relative importance of these factors to riparian&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;U. pumila&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;stem density.&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;U. pumila&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;stem density increased with increasing channel and floodplain restriction and increasing human influence from both urban and rural development. Model selection indicated that local upland&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;U. pumila&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;seed sources were relatively unimportant to riparian&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;U. pumila&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;stem density, suggesting that upland propagule pressure is currently contributing less than other human influences to&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;U. pumila&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;spread along the South Platte River. In particular, higher road density was the most important predictor for the proportional abundance of smaller&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;U. pumila&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;individuals (DBH&amp;lt;5-cm and 5-15-cm), suggesting that human influence in densely populated areas has been the primary driver of recent&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;U. pumila&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;population expansion.&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;U. pumila&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;stem density was only weakly associated with abundance of other common riparian tree species. Land managers and other entities concerned with non-native tree invasion into important riparian habitat may be able to reduce&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;U. pumila&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;spread most effectively by focusing&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;U. pumila&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;control efforts where human influences are greatest.&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1007/s13157-021-01516-4</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Springer</dc:publisher>
  <dc:title>Invasion of Siberian elm (Ulmus pumila) along the South Platte River: The roles of seed source, human influence, and river geomorphology</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>