<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>2007-4298</journal-id>
<journal-title><![CDATA[Botanical Sciences]]></journal-title>
<abbrev-journal-title><![CDATA[Bot. sci]]></abbrev-journal-title>
<issn>2007-4298</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Botánica de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-42982019000400588</article-id>
<article-id pub-id-type="doi">10.17129/botsci.2195</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Impact of Late Pleistocene-Holocene climatic fluctuations on the phylogeographic structure and historical demography of Zamia prasina (Cycadales: Zamiaceae)]]></article-title>
<article-title xml:lang="es"><![CDATA[Impacto de las fluctuaciones climáticas en el Pleistoceno tardío-Holoceno sobre la estructura filogeográfica y demografía histórica de Zamia prasina (Cycadales: Zamiaceae)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Montalvo-Fernández]]></surname>
<given-names><![CDATA[Grecia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-Teyer]]></surname>
<given-names><![CDATA[Lorenzo Felipe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carnevali]]></surname>
<given-names><![CDATA[Germán]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vovides]]></surname>
<given-names><![CDATA[Andrew P.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gaytán-Legaria]]></surname>
<given-names><![CDATA[Ricardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortiz-García]]></surname>
<given-names><![CDATA[Matilde Margarita]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Muñoz-López]]></surname>
<given-names><![CDATA[Jaime Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Castillo]]></surname>
<given-names><![CDATA[Jaime]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Centro de Investigación Científica de Yucatán  ]]></institution>
<addr-line><![CDATA[Mérida Yucatán]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Harvard University Herbaria Orchid Herbarium of Oakes Ames ]]></institution>
<addr-line><![CDATA[Cambridge Massachusetts]]></addr-line>
<country>United States of America</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Instituto de Ecología, A.C.  ]]></institution>
<addr-line><![CDATA[Xalapa Veracruz]]></addr-line>
<country>México</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Investigaciones en Ecosistemas y Sustentabilidad ]]></institution>
<addr-line><![CDATA[Morelia Michoacán]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2019</year>
</pub-date>
<volume>97</volume>
<numero>4</numero>
<fpage>588</fpage>
<lpage>608</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-42982019000400588&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-42982019000400588&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-42982019000400588&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Background:  Glacial periods during the Pleistocene have been hypothesized to have greatly influenced geographical patterns of genetic structure and demography of many tropical species. The Glacial Refugium Hypothesis proposes that, during cold, dry glacial periods, populations of moisture-affinities tropical species were restricted to sheltered, humid areas and that, during warmer and more humid interglacial periods, these populations expanded. Some mountain regions in the tropics acted as refugia during the cold, dry periods of the Pleistocene for several temperate forest taxa, which recolonized the humid areas farther north during the interglacial periods.  Questions:  (1) Did Late Pleistocene-Holocene climate changes affect the historical demophraphy of Zamia prasina? (2) Does the historical distribution of Zamia prasina agree with the Glacial Refugium Hypothesis?  Study species: Zamia prasina W.Bull. (Zamiaceae), the only cycad native to the Yucatan Peninsula Biotic Province (YPBP).  Methods:  Five individuals were collected in 23 populations and characterized using two DNA regions: plastid atpF-atpH, and nuclear ITS2. Genetic diversity, phylogeographic structure, historical demography, and potential distributions were assessed.  Results:  Our results showed moderately high genetic diversity and low, but significant, phylogeographic structure. Two genetic groups were identified, one in the eastern part of the Peninsula, the other in the western. The changes in historical demography suggest that Z. prasina experienced a population expansion following the warm conditions of the Holocene.  Conclusions:  The population dynamics of Zamia prasina are in accordance with the Glacial Refugium Hypothesis.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Antecedentes:  Los períodos glaciales ocurridos en el Pleistoceno tuvieron gran influencia en la estructura genética y demografía de muchas especies tropicales. La Hipótesis del Refugio Glacial propone que, durante los períodos glaciales secos y fríos, las poblaciones de especies tropicales se restringieron a áreas húmedas y que, durante los períodos interglaciales más cálidos y húmedos, estas poblaciones se expandieron. Algunas regiones montañosas de los trópicos actuaron como refugios durante los períodos fríos y secos del Pleistoceno para varios taxones de bosques templados, que recolonizaron las áreas húmedas más al norte durante los períodos interglaciales.  Preguntas:  1) ¿Los cambios climáticos del Pleistoceno tardío-Holoceno afectaron la demografía histórica de Zamia prasina? 2) ¿La distribución histórica de Zamia prasina responde a la Hipótesis de Refugio Glacial?  Especies de estudio: Zamia prasina W. Bull. (Zamiaceae), la única cícada nativa de la Provincia Biótica peninsula de Yucatán (PBPY).  Métodos:  Se colectaron cinco individuos en 23 poblaciones y se caracterizaron utilizando dos regiones de ADN: cloroplasto (atpF-atpH) y nuclear (ITS2). Se evaluó la diversidad genética, estructura filogeográfica, demografía histórica y distribución potencial.  Resultados:  Nuestros resultados mostraron una diversidad genética moderadamente alta y una estructura filogeográfica baja, pero significativa. Se identificaron dos grupos de poblaciones diferenciados geneticamente, uno ubicado en el sureste y el otro al noroeste de la Península. Los cambios en la demografía histórica sugieren que Z. prasina experimentó una expansión poblacional en las condiciones cálidas del Holoceno.  Conclusiones:  La dinámica poblacional de Zamia prasina se ajustan a la Hipótesis de Refugio Glacial.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Cycads]]></kwd>
<kwd lng="en"><![CDATA[demography expansion]]></kwd>
<kwd lng="en"><![CDATA[diversity and genetic differentiation]]></kwd>
<kwd lng="en"><![CDATA[glacial refugium hypothesis]]></kwd>
<kwd lng="en"><![CDATA[Yucatan Peninsula Biotic Province (YPBP)]]></kwd>
<kwd lng="es"><![CDATA[Cicadas]]></kwd>
<kwd lng="es"><![CDATA[expansión demográfica]]></kwd>
<kwd lng="es"><![CDATA[diversidad y diferenciación genética]]></kwd>
<kwd lng="es"><![CDATA[hipótesis de refugio glacial]]></kwd>
<kwd lng="es"><![CDATA[Provincia Biótica Península de Yucatán (PBPY)]]></kwd>
</kwd-group>
</article-meta>
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