<?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>1405-3195</journal-id>
<journal-title><![CDATA[Agrociencia]]></journal-title>
<abbrev-journal-title><![CDATA[Agrociencia]]></abbrev-journal-title>
<issn>1405-3195</issn>
<publisher>
<publisher-name><![CDATA[Colegio de Postgraduados]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-31952018000701031</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Funciones de densidad: una aplicación para delimitar intervalos óptimos de clima y fisiografía para especies forestales]]></article-title>
<article-title xml:lang="en"><![CDATA[Density funcions: an application for delimiting optimal intervals of climate and physiography for forest species]]></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[Quiñones-Pérez]]></surname>
<given-names><![CDATA[Carmen Z.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santiago-García]]></surname>
<given-names><![CDATA[Wenceslao]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Suárez-Mota]]></surname>
<given-names><![CDATA[Mario E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de la Sierra Juárez División de Estudios de Postgrado Instituto de Estudios Ambientales]]></institution>
<addr-line><![CDATA[ Oaxaca]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Tecnológico del Valle del Guadiana  ]]></institution>
<addr-line><![CDATA[ Durango]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>11</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>11</month>
<year>2018</year>
</pub-date>
<volume>52</volume>
<numero>7</numero>
<fpage>1031</fpage>
<lpage>1042</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-31952018000701031&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-31952018000701031&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-31952018000701031&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El espacio que ocupa una especie en el sistema natural puede delimitarse por el medio físico-geográfico o por las condiciones ambientales que lo definen. El objetivo de este estudio fue delimitar intervalos climáticos en los que ocurre la tasa de presencia máxima de tres especies arbóreas (Pinus pseudostrobus Lindl (var. Apulcensis), Pinus patula Schl. et Cham y Quercus macdougallii Martínez) nativas de la Sierra Norte de Oaxaca, México, en función de nueve variables ambientales usando la función de densidad de Weibull y el modelo de Gauss de mezclas finitas. Para lo anterior, se usaron datos de 634 parcelas de 1,000 m2 las cuales se establecieron sistemáticamente en el área de estudio. Los resultados mostraron que la alta dispersión de dos de las especies estudiadas (ambas de pino) está relacionada con la precipitación media de abril a septiembre; en contraste, la escasa presencia de Quercus magdougalli (especie endémica) parece estar relacionada con los intervalos reducidos de la precipitación en el invierno y la altitud. Las dos funciones de densidad probadas permitieron definir los intervalos ambientales óptimos para cada especie. El modelo de mezclas finitas fue más flexible que la función de Weibull al identificar distribuciones bimodales, en particular para las dos especies de pino cuyo patrón de dispersión observado fue más heterogéneo que el de Quercus. Los resultados obtenidos podrían servir para priorizar áreas con fines de conservación y comercialización.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The space a species occupies in a natural system can be delimited by the physical-geographic medium or by the environmental conditions that define it. The objective of this study was to delimit climate intervals in which the maximum presence rate occurs of three tree species native to the Sierra Norte of Oaxaca, Mexico (Pinus pseudostrobus Lindl (var. Apulcensis), Pinus patula Schl. et Cham, and Quercus macdougallii Martínez), in function of nine environmental variables using the Weibull density function and the finite Gaussian mixture model. To this end, we used data from 634 plots measuring 1,000 m2, which were established systematically in the study area. The results showed that high dispersion of the two pines species is related to mean precipitation from April to September. In contrast, the scarce presence of Quercus magdougalli, an endemic species, seems to be related to the reduced intervals of winter precipitation and to altitude. The two density functions tested allowed definition of optimal environmental intervals for each species. The finite mixture model was more flexible than the Weibull function when identifying bimodal distributions, particularly for the two pines species, whose observed dispersion pattern was more heterogeneous than that of Quercus. The results obtained will serve to prioritize areas for purposes of conservation or commercialization.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Modelo de Gauss de mezclas finitas]]></kwd>
<kwd lng="es"><![CDATA[función de Weibull]]></kwd>
<kwd lng="es"><![CDATA[Quercus magdougalli]]></kwd>
<kwd lng="es"><![CDATA[Sierra Norte de Oaxaca]]></kwd>
<kwd lng="es"><![CDATA[bosque templado]]></kwd>
<kwd lng="en"><![CDATA[Gaussian mixture model]]></kwd>
<kwd lng="en"><![CDATA[Weibull function]]></kwd>
<kwd lng="en"><![CDATA[Quercus magdougalli]]></kwd>
<kwd lng="en"><![CDATA[Sierra Norte of Oaxaca]]></kwd>
<kwd lng="en"><![CDATA[temperate forest]]></kwd>
</kwd-group>
</article-meta>
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