<?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>0187-7151</journal-id>
<journal-title><![CDATA[Acta botánica mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Act. Bot. Mex]]></abbrev-journal-title>
<issn>0187-7151</issn>
<publisher>
<publisher-name><![CDATA[Instituto de Ecología A.C., Centro Regional del Bajío]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-71512016000200065</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Nota sobre la estructura poblacional de Echinocactus platyacanthus (Cactaceae) en la Reserva de la Biósfera "Barranca de Metztitlán", Hidalgo, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Note on the population structure of Echinocactus platyacanthus (Cactaceae) in the Biosphere Reserve "Barranca de Metztitlán", Hidalgo, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castañeda-Romero]]></surname>
<given-names><![CDATA[Malinali]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Luna-Contreras]]></surname>
<given-names><![CDATA[Monserrat]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vela-Godinez]]></surname>
<given-names><![CDATA[Daniel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Montoya-Santiago]]></surname>
<given-names><![CDATA[Gessel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Bermúdez]]></surname>
<given-names><![CDATA[Alejandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez Peña]]></surname>
<given-names><![CDATA[Rodrigo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Esperón-Rodríguez]]></surname>
<given-names><![CDATA[Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Ciencias ]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Macquarie University Faculty of Sciences and Engineering Department of Biological Sciences]]></institution>
<addr-line><![CDATA[Sydney ]]></addr-line>
<country>Australia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2016</year>
</pub-date>
<numero>115</numero>
<fpage>65</fpage>
<lpage>73</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-71512016000200065&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-71512016000200065&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-71512016000200065&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Echinocactus platyacanthus es uno de los cactus más abundantes y ampliamente distribuidos en México. En este trabajo se comparó la estructura poblacional de esta especie en dos áreas con grado de accesibilidad contrastante dentro de la Reserva de la Biósfera "Barranca de Metztitlán" en Hidalgo. El sitio de alcance difícil (S1) presentó un número más grande de individuos, con mayor altura y más organismos juveniles. Por su parte, la localidad con fácil acceso (S2) registró un predominio de adultos. Se censaron 456 plantas y solo se encontró una plántula. Se estimó una densidad de 1410 individuos/ha en S1 y únicamente 863 en S2. En ambos sitios se determinó el tipo de población como regresiva, ya que los individuos de la etapa de madurez se encontraron en un número significativamente más grande y la cantidad de los juveniles fue muy baja (12.9%), hecho que sugiere un futuro decline poblacional.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Echinocactus platyacanthus is one of the most abundant and widely distributed cacti in Mexico. In this work we compared the population structure of this species in two areas with contrasting accessibility degree within the Biosphere Reserve "Barranca de Metztitlán" in the state of Hidalgo. The site with difficult accessibility (S1) had a larger total number of individuals, with larger dimensions, and more juveniles. The site with easy accessibility (S2) had a predominance of adults. A total of 456 individuals were counted and only one sapling was found. We estimated a population density of 1410 individuals/ha in S1 and 863 individuals/ha in S2. We determined the type of population as regressive, because in both sites we found a significantly larger number of individuals in the stage of maturity and a low number of juveniles (12.9%), which suggests a future population decline.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Barranca de Metztitlán]]></kwd>
<kwd lng="es"><![CDATA[biznaga dulce o de barril]]></kwd>
<kwd lng="es"><![CDATA[Echinocactus platyacanthus]]></kwd>
<kwd lng="es"><![CDATA[población regresiva]]></kwd>
<kwd lng="en"><![CDATA[Barranca de Metztitlán]]></kwd>
<kwd lng="en"><![CDATA[Echinocactus platyacanthus]]></kwd>
<kwd lng="en"><![CDATA[regressive population]]></kwd>
<kwd lng="en"><![CDATA[sweet or barrel biznaga]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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