<?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>S2007-42982019000400685</article-id>
<article-id pub-id-type="doi">10.17129/botsci.2262</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Demografía y estructura poblacional de Dioon angustifolium (Zamiaceae) en el noreste de México]]></article-title>
<article-title xml:lang="en"><![CDATA[Demography and population structure of Dioon angustifolium (Zamiaceae) in northeastern Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rubio-Méndez]]></surname>
<given-names><![CDATA[Gabriel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Yáñez-Espinosa]]></surname>
<given-names><![CDATA[Laura]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Salinas-Rodríguez]]></surname>
<given-names><![CDATA[María Magdalena]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández-Hernández]]></surname>
<given-names><![CDATA[Karen Abigail]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Balderas-González]]></surname>
<given-names><![CDATA[David]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de San Luis Potosí  ]]></institution>
<addr-line><![CDATA[San Luis Potosí ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de San Luis Potosí Instituto de Investigación de Zonas Desérticas ]]></institution>
<addr-line><![CDATA[San Luis Potosí ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma de Querétaro Facultad de Ciencias Naturales ]]></institution>
<addr-line><![CDATA[Querétaro ]]></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>685</fpage>
<lpage>690</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-42982019000400685&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-42982019000400685&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-42982019000400685&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Antecedentes: Dioon angustifolium es una especie endémica que se distribuye en el extremo noreste de la Sierra Madre Oriental. Se clasifica como especie en peligro de extinción debido a actividades antrópicas como la extracción ilegal con fines comerciales.  Pregunta:  ¿Cuál es el estado actual de la estructura de las poblaciones de Dioon angustifolium en su área de distribución?  Especie en estudio: Dioon angustifolium Miq. (Zamiaceae), especie endémica de la Sierra Madre Oriental en México.  Lugar y años de estudio:  El estudio se realizó en tres poblaciones de D. angustifolium en Nuevo León (DA1, DA2) y Tamaulipas (DA3) durante el verano de 2018  Métodos:  Se determinó la densidad y estructura poblacional de D. angustifolium mediante transectos de 100 m de largo. Para cada una de las poblaciones analizadas se construyó una tabla de vida estática.  Resultados:  La mayor densidad correspondió a la población DA1 y la menor a DA3. Esta última población está dominada por individuos en fase juvenil. Las tablas de vida indican alta tasa de mortalidad en las primeras etapas del establecimiento, lo que provoca que las poblaciones se encuentren en decremento por la falta de reclutamiento de nuevos individuos.  Conclusiones:  La extracción de individuos para su comercialización, así como el cambio de uso de suelo disminuyen el tamaño de las poblaciones. De acuerdo con información proporcionada por lugareños, las semillas son utilizadas para elaborar tortillas y atole, sin que se tengan datos de los volúmenes de extracción para poder cuantificar el efecto sobre la dinámica poblacional.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Background: Dioon angustifolium is an endemic species distributed in the northernmost Sierra Madre Oriental in Mexico. It is classified as an endangered species due to anthropogenic activities like illegal extraction for commercial purposes.  Question:  What is the current status of Dioon angustifolium populations structure in its distribution range?  Species under study: Dioon angustifolium Miq. (Zamiaceae), an endemic species of the Sierra Madre Oriental in Mexico.  Study area and years of study:  The study was conducted in three populations of D. angustifolium in Nuevo León and Tamaulipas during the summer of 2018.  Methods:  The density and population structure of D. angustifolium was determined by transects of 100 m long. For each of the analyzed populations, a static life table was built.  Results:  The highest density corresponded to the DA1 population and the lowest to DA3. This last population is dominated by individuals in the juvenile phase. The life tables indicate a high mortality rate in the first stages of establishment, which causes the populations to be in decline due to the lack of recruitment of new individuals.  Conclusions:  The extraction of individuals for commercialization, as well as the change of land use decreases the size of the populations. According to information provided by locals, seeds are used to cook food like tortillas and atole, without having data on extraction volumes to quantify the effect on population dynamics.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Cícadas]]></kwd>
<kwd lng="es"><![CDATA[demografía]]></kwd>
<kwd lng="es"><![CDATA[Dioon angustifolium]]></kwd>
<kwd lng="es"><![CDATA[Sierra Madre Oriental]]></kwd>
<kwd lng="es"><![CDATA[uso alimentario]]></kwd>
<kwd lng="en"><![CDATA[Cycads]]></kwd>
<kwd lng="en"><![CDATA[demography]]></kwd>
<kwd lng="en"><![CDATA[Dioon angustifolium]]></kwd>
<kwd lng="en"><![CDATA[food use]]></kwd>
<kwd lng="en"><![CDATA[Sierra Madre Oriental]]></kwd>
</kwd-group>
</article-meta>
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