<?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>S1405-27682016000200019</article-id>
<article-id pub-id-type="doi">10.18387/polibotanica.42.2</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Gramíneas de los mezquitales en el centro-norte de Nuevo León]]></article-title>
<article-title xml:lang="en"><![CDATA[Grasses of mesquite woodland in north-central Nuevo Leon]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guzmán-Lucio]]></surname>
<given-names><![CDATA[Marco Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Foroughbakhch-Pournavab]]></surname>
<given-names><![CDATA[Rahim]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alvarado-Vázquez]]></surname>
<given-names><![CDATA[Marco Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rocha-Estrada]]></surname>
<given-names><![CDATA[Alejandra]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Salcedo-Martínez]]></surname>
<given-names><![CDATA[Sergio Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Moreno-Limón]]></surname>
<given-names><![CDATA[Sergio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Nuevo León Facultad de Ciencias Biológicas Departamento de Botánica]]></institution>
<addr-line><![CDATA[San Nicolás de los Garza Nuevo León]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2016</year>
</pub-date>
<numero>42</numero>
<fpage>19</fpage>
<lpage>42</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-27682016000200019&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-27682016000200019&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-27682016000200019&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Los trabajos ecológicos de las gramíneas en México han sido enfocados principalmente en algunas especies nativas del pastizal y de algunos zacates cultivados preferentemente tropicales. En este estudio se analizan algunos aspectos ecológicos y comparativos entre el grupo de las gramíneas y con respecto al resto del componente herbáceo que ocurre dentro de los mezquitales en la porción centro-norte del estado de Nuevo León. Con el propósito de lograr la mejor representación el estudio se realizó en el área de confluencia de tres Provincias Fisiográficas del estado: Gran Llanura de Norteamérica, Llanura Costera del Golfo Norte y Sierra Madre Oriental, en donde se establecieron 20 sitios de muestra distribuidos en 14 municipios. Se analiza la información agrostológica y la importancia ecológica de las gramíneas y se obtiene el valor de importancia para las especies encontradas. Adicionalmente se reconocen las especies invasoras y se analiza la diversidad existente entre los sitios mediante la aplicación de diversos índices y los porcentajes de semejanza de especies de gramíneas entre las comunidades de mezquital. Se identificaron 25 especies de gramíneas, en general menos de cinco especies por sitio. Las especies con mayor valor de importancia fueron Setaria texana y Bouteloua trifida. La densidad promedio de gramíneas en los sitios estudiados fue de 43 006 plantas por hectárea. En general la diversidad, repartición y semejanza entre sitios con respecto a las gramíneas fueron bajas a moderadas ya que el 65% de los sitios tuvo menos de cinco especies, influyendo las distintas condiciones de perturbación asociadas a los sitios. Se propone a Setaria texana como una especie clave en los pastizales del noreste de México.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Ecological research on Mexican grasses has focused mainly on some native species of grassland communities and some cultivated pastures, mostly tropical. In this study some ecological aspects of grasses are analyzed and a comparison of the group with the rest of the herbaceous component that occurs within the mesquite woodland in the north central portion of Nuevo Leon state. In order to achieve the best representation, the study was conducted at the intersection between the three state physiographic provinces: North Great Plain, Northern Gulf Coastal Plain and Sierra Madre Oriental, where 20 sample sites in 14 municipalities were established. Agrostological richness and ecological importance of grasses were analyzed and the Values of Importance for species found calculated. Additionally, invasive species were recognized in mesquite communities; the diversity among sites by applying different rates and percentages of species similarity between communities of mesquite is analyzed. 25 grass species were identified, in general less than five species per site. Setaria texana and Bouteloua trifida had the highest importance values. Average density of grasses in studied sites was 43 006 plants by hectare. Overall diversity, evenness and similarity between sites regarding grass was low to moderate because 65% of the sites had less than five species, affecting different disturbance conditions associated with the sites. Setaria texana is proposed as a key species in the grasslands of north-eastern Mexico.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[gramíneas]]></kwd>
<kwd lng="es"><![CDATA[valor de importancia]]></kwd>
<kwd lng="es"><![CDATA[diversidad]]></kwd>
<kwd lng="es"><![CDATA[semejanza]]></kwd>
<kwd lng="en"><![CDATA[grasses]]></kwd>
<kwd lng="en"><![CDATA[importance value]]></kwd>
<kwd lng="en"><![CDATA[diversity indices]]></kwd>
<kwd lng="en"><![CDATA[similarity]]></kwd>
</kwd-group>
</article-meta>
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