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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>Tana E. Wood</dc:contributor>
  <dc:contributor>Sasha C. Reed</dc:contributor>
  <dc:contributor>Kaylie M. Butts</dc:contributor>
  <dc:contributor>Molly A. Cavaleri</dc:contributor>
  <dc:creator>Kelsey R. Carter</dc:creator>
  <dc:date>2021</dc:date>
  <dc:description>&lt;div class="abstract-group"&gt;&lt;div class="article-section__content en main"&gt;&lt;p&gt;Tropical forest canopies cycle vast amounts of carbon, yet we still have a limited understanding of how these critical ecosystems will respond to climate warming. We implemented in situ leaf-level + 3°C experimental warming from the understory to the upper canopy of two Puerto Rican tropical tree species,&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Guarea guidonia&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;and&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Ocotea sintenisii&lt;/i&gt;. After approximately 1 month of continuous warming, we assessed adjustments in photosynthesis, chlorophyll fluorescence, stomatal conductance, leaf traits and foliar respiration. Warming did not alter net photosynthetic temperature response for either species; however, the optimum temperature of&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Ocotea&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;understory leaf photosynthetic electron transport shifted upward. There was no&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Ocotea&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;respiratory treatment effect, while&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Guarea&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;respiratory temperature sensitivity (&lt;i&gt;Q&lt;/i&gt;&lt;sub&gt;10&lt;/sub&gt;) was down-regulated in heated leaves. The optimum temperatures for photosynthesis (&lt;i&gt;T&lt;/i&gt;&lt;sub&gt;opt&lt;/sub&gt;) decreased 3–5°C from understory to the highest canopy position, perhaps due to upper canopy stomatal conductance limitations.&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Guarea&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;upper canopy&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;T&lt;/i&gt;&lt;sub&gt;opt&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;was similar to the mean daytime temperatures, while&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;Ocotea&lt;/i&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;canopy leaves often operated above&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;i&gt;T&lt;/i&gt;&lt;sub&gt;opt&lt;/sub&gt;. With minimal acclimation to warmer temperatures in the upper canopy, further warming could put these forests at risk of reduced CO&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;uptake, which could weaken the overall carbon sink strength of this tropical forest.&lt;/p&gt;&lt;/div&gt;&lt;/div&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1111/pce.14134</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Wiley</dc:publisher>
  <dc:title>Experimental warming across a tropical forest canopy height gradient reveals minimal photosynthetic and respiratory acclimation</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>