<?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>R.J. DiStefano</dc:contributor>
  <dc:contributor>Daniel D. Magoulick</dc:contributor>
  <dc:creator>Jacob T. Westhoff</dc:creator>
  <dc:date>2012</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;The Big Creek Crayfish,&amp;nbsp;&lt;/span&gt;&lt;i&gt;Orconectes peruncus&lt;/i&gt;&lt;span&gt;, is native to the St. Francis River drainage in Missouri, USA and is often absent where the introduced Woodland Crayfish,&amp;nbsp;&lt;/span&gt;&lt;i&gt;Orconectes hylas&lt;/i&gt;&lt;span&gt;, has established. We performed a field experiment to determine whether effects of current abiotic conditions and interspecific competition with&amp;nbsp;&lt;/span&gt;&lt;i&gt;O. hylas&lt;/i&gt;&lt;span&gt;&amp;nbsp;were responsible for displacement of&amp;nbsp;&lt;/span&gt;&lt;i&gt;O. peruncus&lt;/i&gt;&lt;span&gt;&amp;nbsp;from parts of their former range. We examined growth and survival of juvenile male&amp;nbsp;&lt;/span&gt;&lt;i&gt;O. peruncus&lt;/i&gt;&lt;span&gt;&amp;nbsp;exposed to juvenile male&amp;nbsp;&lt;/span&gt;&lt;i&gt;O. hylas&lt;/i&gt;&lt;span&gt;&amp;nbsp;in enclosures at two sites in the former range of&amp;nbsp;&lt;/span&gt;&lt;i&gt;O. peruncus&lt;/i&gt;&lt;span&gt;. Enclosures contained 8 (low density) or 16 individuals (high density) and had&amp;nbsp;&lt;/span&gt;&lt;i&gt;O. peruncus&lt;/i&gt;&lt;span&gt;&amp;nbsp;only (control) or both species (interspecific treatment). Juvenile&amp;nbsp;&lt;/span&gt;&lt;i&gt;O. peruncus&lt;/i&gt;&lt;span&gt;&amp;nbsp;were able to survive and grow in portions of their former range, implicating biotic versus abiotic factors in the displacement of&amp;nbsp;&lt;/span&gt;&lt;i&gt;O. peruncus&lt;/i&gt;&lt;span&gt;. Survival rates of&amp;nbsp;&lt;/span&gt;&lt;i&gt;O. peruncus&lt;/i&gt;&lt;span&gt;&amp;nbsp;did not differ among treatments at either site.&amp;nbsp;&lt;/span&gt;&lt;i&gt;Orconectes peruncus&lt;/i&gt;&lt;span&gt;&amp;nbsp;showed significant growth in all treatments and interspecific effects were not greater than intraspecific effects on&amp;nbsp;&lt;/span&gt;&lt;i&gt;O. peruncus&lt;/i&gt;&lt;span&gt;&amp;nbsp;growth rates. High-density treatments showed significantly reduced&amp;nbsp;&lt;/span&gt;&lt;i&gt;O. peruncus&lt;/i&gt;&lt;span&gt;&amp;nbsp;growth rates compared to low-density treatments, except in Carver Creek interspecific treatments. When considered in the context of previous studies examining the effects of&amp;nbsp;&lt;/span&gt;&lt;i&gt;O. hylas&lt;/i&gt;&lt;span&gt;&amp;nbsp;on&amp;nbsp;&lt;/span&gt;&lt;i&gt;O. peruncus&lt;/i&gt;&lt;span&gt;, results suggest that neither direct competition between juvenile males of the two species or abiotic change are responsible for the decreased range of&amp;nbsp;&lt;/span&gt;&lt;i&gt;O. peruncus&lt;/i&gt;&lt;span&gt;. Additional research is required to determine the mechanism(s) driving the displacement of&amp;nbsp;&lt;/span&gt;&lt;i&gt;O. peruncus&lt;/i&gt;&lt;span&gt;.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1007/s10750-011-0939-2</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Springer Link</dc:publisher>
  <dc:title>Do environmental changes or juvenile competition act as mechanisms of species displacement in crayfishes?</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>