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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>Hans Brix</dc:contributor>
  <dc:contributor>Karen L. McKee</dc:contributor>
  <dc:contributor>I.A. Mendelssohn</dc:contributor>
  <dc:contributor>ShiLi Miao</dc:contributor>
  <dc:creator>Bent Lorenzen</dc:creator>
  <dc:date>2000</dc:date>
  <dc:description>&lt;p&gt;The germination requirements of&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Cladium jamaicense&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;Crantz and&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Typha domingensis&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;Pers. were studied under controlled conditions in the laboratory. Treatments included six temperature regimes, (constant temperatures of 15 20, 25, 30°C, and two fluctuating day&amp;nbsp;:&amp;nbsp;night temperature regimes of 25&amp;nbsp;:&amp;nbsp;10°C and 30&amp;nbsp;:&amp;nbsp;20°C), two light levels (14&amp;nbsp;:&amp;nbsp;10&amp;nbsp;h light&amp;nbsp;:&amp;nbsp;dark photoperiod and 24&amp;nbsp;h dark environment), two substrates (peat and water) and two O&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;levels (atmospheric and low (4.34%) O&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;concentration) using a complete randomized block design.&lt;/p&gt;&lt;p&gt;The average incubation period needed for seeds to germinate was shorter for&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;T. domingensis&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;(1.1–19.5 days) than for&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;C. jamaicense&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;(26–46 days) and the final germination percentage was higher for&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;T. domingensis&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;than for&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;C. jamaicense&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;(85 vs. 42 %).&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Cladium jamaicense&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;only germinated with fluctuating temperatures whereas&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;T. domingensis&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;germinated at all temperature regimes. Light was required for&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;T. domingensis&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;seeds to germinate, whereas&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;C. jamaicense&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;could germinate at a reduced rate in the dark. Peat substrate had a positive effect on germination in both species. Peat substrate shortened the incubation period for seeds of both species, enhanced germination of&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;T. domingensis&lt;/i&gt;, especially at low temperatures, and enhanced germination of&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;C. jamaicense&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;in the dark. Low oxygen availability did not influence the germination of&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;C. jamaicense&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;but enhanced germination of&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;T. domingensis&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;at low temperatures. Although the two species differ significantly in their germination requirements and responses to specific environmental conditions, germination of both these species was enhanced by environmental conditions typical of exposed water saturated mudflats or sediment surfaces.&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Typha domingensis&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;produces a large number of small seeds, which do not germinate when covered by sediment. In contrast,&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;C. jamaicense&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;produces fewer and larger seeds, with resources able to support growth through a thin layer of sediment or detritus.&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1016/S0304-3770(99)00076-5</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Elsevier</dc:publisher>
  <dc:title>Seed germination of two Everglades species, Cladium jamaicense and Typha domingensis</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>