<?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>1405-2768</journal-id>
<journal-title><![CDATA[Polibotánica]]></journal-title>
<abbrev-journal-title><![CDATA[Polibotánica]]></abbrev-journal-title>
<issn>1405-2768</issn>
<publisher>
<publisher-name><![CDATA[Instituto Politécnico Nacional, Escuela Nacional de Ciencias Biológicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-27682024000200119</article-id>
<article-id pub-id-type="doi">10.18387/polibotanica.58.8</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Diversidad de la vegetación a través de un gradiente del humedal Oasis San Ignacio, Baja California Sur, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Vegetation diversity through a humidity gradient of San Ignacio Oasis, Baja California Sur, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Silva Ávila]]></surname>
<given-names><![CDATA[Nancy]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández]]></surname>
<given-names><![CDATA[Francisco Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nájera Luna]]></surname>
<given-names><![CDATA[Juan Abel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aguirre-Calderón]]></surname>
<given-names><![CDATA[Carlos Enrique]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Tecnológico Nacional de México Instituto Tecnológico de El Salto División de Estudios de Posgrado e Investigación]]></institution>
<addr-line><![CDATA[El Salto Durango]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<numero>58</numero>
<fpage>119</fpage>
<lpage>133</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-27682024000200119&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-27682024000200119&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-27682024000200119&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La humedad del suelo es un factor ambiental importante que afecta la composición, diversidad y estructura de las comunidades vegetales. Considerando lo anterior, el objetivo de este estudio fue determinar los cambios de diversidad vegetal que ocurren entre la fuente de humedad del Oasis San Ignacio y el desierto circundante de Baja California Sur. El área de estudio se dividió en nueve franjas de 100 m de ancho, sobre las cuales se seleccionaron aleatoriamente 140 sitios de 500, 20 y 1 m2 para registrar las especies vegetales de los estratos arbóreos, arbustivos y herbáceos, respectivamente. Se estimaron los índices de riqueza, diversidad de Shannon-Weiner, dominancia de Simpson, equidad de Pielou y valor verdadero de especies y se evaluaron los cambios entre las franjas establecidas. A su vez, se estimó el índice cualitativo de similitud de especies de Sörensen, generándose dendrogramas para agrupar comunidades vegetales similares establecidas sobre el gradiente estudiado. La riqueza y diversidad de las especies del estrato herbáceo y arbústivo decrecen abruptamente a los 520 y 720 m del cuerpo de agua, respectivamente. La riqueza y diversidad de la vegetación del estrato arbóreo no presenta una tendencia definida. El índice de similitud permitió concentrar las especies del estrato herbáceo, arbustivo y arbóreo en 4, 5 y 3 grupos, respectivamente. Los análisis de diversidad, sugieren que las especies herbáceas y arbustivas son más sensibles a los cambios de humedad que las arbóreas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Soil humidity is an important environmental factor that affect composition, diversity and structure of the vegetal communities. The objective of the present study was to determine the diversity changes that occur over an environmental gradient limited by the source of water of the oasis San Ignacio and the adjoining desert of Baja California Sur, Mexico. The study area was divided in nine strips of 100 m width. Over them, there were randomly selected 140 plots of 500, 20 and 1 m2 to register the vegetal species present in the tree, shrub and herbaceous layers, respectively. Species richness, Shannon-Weiner diversity, Simpson dominance, Pielou equity and true species value indexes were estimated and compared between established strips. The qualitative index of Sörensen was estimated to evaluate species similitude and similar communities were grouped applying dendrograms. The species richness of the herbaceous and shrub layers falls abruptly at 520 and 720 m far away from the source of water. Species richness and diversity in the tree layer presented an undefined tendency. The similitude index allowed to concentrate the herbaceous, shrub and tree vegetation layers in 4, 5 and 3 clusters. This diversity analysis suggests to determine that herbaceous and shrub species are more sensitive to humidity changes than arboreal species.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Riqueza de especies]]></kwd>
<kwd lng="es"><![CDATA[desierto]]></kwd>
<kwd lng="es"><![CDATA[dendrograma]]></kwd>
<kwd lng="es"><![CDATA[índices de Shannon]]></kwd>
<kwd lng="es"><![CDATA[índice de Simpson]]></kwd>
<kwd lng="es"><![CDATA[índice de Sorensen]]></kwd>
<kwd lng="en"><![CDATA[Species richness]]></kwd>
<kwd lng="en"><![CDATA[desert]]></kwd>
<kwd lng="en"><![CDATA[dendrogram]]></kwd>
<kwd lng="en"><![CDATA[Shannon index]]></kwd>
<kwd lng="en"><![CDATA[Simpson index]]></kwd>
<kwd lng="en"><![CDATA[Sorensen index]]></kwd>
</kwd-group>
</article-meta>
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