<?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>1870-3453</journal-id>
<journal-title><![CDATA[Revista mexicana de biodiversidad]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Mex. Biodiv.]]></abbrev-journal-title>
<issn>1870-3453</issn>
<publisher>
<publisher-name><![CDATA[Instituto de Biología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1870-34532016000200288</article-id>
<article-id pub-id-type="doi">10.1016/j.rmb.2016.04.006</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[El uso de espinas del tallo en la identificación de las especies de Neobuxbaumia (Cactaceae)]]></article-title>
<article-title xml:lang="en"><![CDATA[Using stem spines in the identification of Neobuxbaumia species (Cactaceae)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tapia]]></surname>
<given-names><![CDATA[Héctor J.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arias]]></surname>
<given-names><![CDATA[Salvador]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Yáñez-Espinosa]]></surname>
<given-names><![CDATA[Laura]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Terrazas]]></surname>
<given-names><![CDATA[Teresa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Biología Jardín Botánico]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de San Luis Potosí Instituto de Investigación de Zonas Desérticas ]]></institution>
<addr-line><![CDATA[San Luis Potosí ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Biología Departamento de Botánica]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2016</year>
</pub-date>
<volume>87</volume>
<numero>2</numero>
<fpage>288</fpage>
<lpage>300</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-34532016000200288&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-34532016000200288&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-34532016000200288&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Este estudio evaluó la morfometría de variables de orientación y tamaño de las espinas, con el objetivo de indagar sobre la utilidad de los patrones de espinación en la identificación de las especies del género Neobuxbaumia (Cactaceae: Cactoideae: Echinocereeae). Este análisis se apoyó en un procedimiento de determinación taxonómica tradicional y en herramientas de estadística multivariada. Las variables se registraron en categorías preestablecidas en función de la organización de la areola. Se obtuvieron estadísticos circulares básicos y se construyeron los gráficos descriptivos que representan los patrones de espinación. Se aplicó un análisis canónico discriminante y un clasificatorio a partir de la asignación -a priori- de especies. La capacidad para asignar correctamente los individuos dentro de su especie fue de 89.6%, en promedio. La orientación y la longitud de las espinas mostraron potencial para identificar a la mayoría de las especies de Neobuxbaumia, además de la especie relacionada Pseudomitrocereus fulviceps. El uso complementario de otros atributos morfológicos vegetativos permite una identificación más robusta de las especies, como se refleja en la clave de identificación incluida. Se considera de valor taxonómico el reconocimiento de patrones de espinación para identificar especies en otros grupos de cactáceas en ausencia de estructuras reproductivas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: This study evaluated the morphometry of spine variables, orientation and length, in order to investigate the utility of spination patterns for species identification within the genus Neobuxbaumia (Cactaceae: Cactoideae: Echinocereeae). This analysis is based on a traditional taxonomic identification method and on multivariate statistical tools. Spine variables were recorded on preset categories relying on the areole organization. We obtained basic circular descriptive statistics and built graphs representing the spination pattern of each species. Canonical discriminant and classificatory analyses were applied from an -a priori- assignation of species. The ability to assign individuals to their species was 89.6%, on average. The orientation and length of the spines showed potential to identify most of the species of Neobuxbaumia, as well as the related species Pseudomitrocereus fulviceps. The complementary use of other vegetative morphological characters enables a more robust identification of species, as reflected on the identification key included. The recognition of spination patterns is considered of taxonomic value to identify species in other cacti groups in absence of reproductive structures.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Morfometría]]></kwd>
<kwd lng="es"><![CDATA[Patrón de espinación]]></kwd>
<kwd lng="es"><![CDATA[Orientación de espinas]]></kwd>
<kwd lng="en"><![CDATA[Morphometry]]></kwd>
<kwd lng="en"><![CDATA[Spination pattern]]></kwd>
<kwd lng="en"><![CDATA[Orientation of spines]]></kwd>
</kwd-group>
</article-meta>
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