<?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>S0187-71512022000100111</article-id>
<article-id pub-id-type="doi">10.21829/abm129.2022.1962</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Efecto de la altitud, pendiente y exposición geográfica en la distribución de helechos arborescentes]]></article-title>
<article-title xml:lang="en"><![CDATA[Effect of altitude, slope and geographic exposure on tree fern distribution]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Antúnez]]></surname>
<given-names><![CDATA[Pablo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López Serrano]]></surname>
<given-names><![CDATA[Pablito Marcelo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González Adame]]></surname>
<given-names><![CDATA[Gabriel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rubio Camacho]]></surname>
<given-names><![CDATA[Ernesto Alonso]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mendoza Díaz]]></surname>
<given-names><![CDATA[María Magdalena]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de la Sierra Juárez Instituto de Estudios Ambientales División de Estudios de Posgrado]]></institution>
<addr-line><![CDATA[ Oaxaca]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Juárez del Estado de Durango Instituto de Silvicultura e Industria de la Madera ]]></institution>
<addr-line><![CDATA[Durango ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad de la Sierra Juárez Instituto de Estudios Ambientales Herbario UNSIJ]]></institution>
<addr-line><![CDATA[Ixtlán Oaxaca]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Georg-August University of Goettingen Department Ecoinformatics, Biometrics &amp; Forest Growth ]]></institution>
<addr-line><![CDATA[Goettingen ]]></addr-line>
<country>Germany</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias  ]]></institution>
<addr-line><![CDATA[Tepatitlán Jalisco]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<numero>129</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-71512022000100111&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-71512022000100111&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-71512022000100111&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Antecedentes y Objetivos:  El conocimiento de los rasgos topográficos de un sitio es importante para comprender la diversidad local y monitorear la respuesta de las plantas de alto interés de conservación al cambio climático o al cambio de uso de suelo. El objetivo de este trabajo fue examinar el patrón de distribución de cuatro especies de helechos arborescentes en función de la altitud, la exposición y la pendiente a lo largo de un continuo altitudinal.  Métodos:  Se estudió el efecto de la altitud, pendiente y exposición geográfica en la distribución de Alsophila firma, Cyathea bicrenata, Cyathea myosuroides y Sphaeropteris horrida, en La Chinantla, al norte de Oaxaca, México. La hipótesis de homogeneidad de proporciones a los factores topográficos se verificó con la prueba de Chi cuadrada y la magnitud de incidencia mediante funciones polinómicas.  Resultados clave:  Se observaron diferencias significativas entre las proporciones de cada especie en función de cada variable topográfica. En promedio, la pendiente mostró un índice de importancia 43.48 veces más que la orientación geográfica y 2.50 veces más que la altitud. Se observaron similitudes entre el nicho parcial de Cyathea bicrenata y de Alsophila firma, pero disimilitudes entre Alsophila firma y Cyathea myosuroides.  Conclusiones:  La distribución de proporciones de los helechos arborescentes a nivel local es discontinua y no uniforme, atribuible a la acción de los factores locales predominantes, principalmente a la topografía. Una topografía heterogénea propicia patrones de distribución más aleatorios.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Background and Aims: Knowledge of the topographic characteristics of a site is important to understand the local diversity and for proper monitoring of the response of plants with high conservation interest to climate change or land use change. The objective was to examine the distribution pattern of four tree fern species in function of elevation above sea level, exposure, and slope along an altitudinal continuum.  Methods:  The effect of altitude, slope and geographic exposure on the distribution of Alsophila firma, Cyathea bicrenata, Cyathea myosuroides and Sphaeropteris horrida was studied in La Chinantla, northern Oaxaca, Mexico. The hypothesis of homogeneity of proportions to the change of topographic factors was verified by the Chi square test and the degree of incidence with polynomial functions.  Key results: Significant differences between the proportions of each species as a function of each topographic variable were observed. On average, the slope showed an index of significance 43.48 times greater than geographic orientation and 2.50 times greater than elevation above sea level. We observed similarities between the partial niche of Cyathea bicrenata and Alsophila firma, but dissimilarities between Alsophila firma and Cyathea myosuroides.  Conclusions: The distribution of tree fern proportions at the local level is discontinuous and non-uniform, attributable to the action of the predominant local factors, mainly topography. Heterogeneous topography leads to highly random distribution patterns of the species studied.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[bosque mesófilo de montaña]]></kwd>
<kwd lng="es"><![CDATA[Chi cuadrada]]></kwd>
<kwd lng="es"><![CDATA[comparación de proporciones]]></kwd>
<kwd lng="es"><![CDATA[conservación]]></kwd>
<kwd lng="es"><![CDATA[regresión probabilística]]></kwd>
<kwd lng="en"><![CDATA[Chi square]]></kwd>
<kwd lng="en"><![CDATA[comparison of proportions]]></kwd>
<kwd lng="en"><![CDATA[conservation]]></kwd>
<kwd lng="en"><![CDATA[mountain cloud forest]]></kwd>
<kwd lng="en"><![CDATA[probabilistic regression]]></kwd>
</kwd-group>
</article-meta>
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