<?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>S1870-34532019000100602</article-id>
<article-id pub-id-type="doi">10.22201/ib.20078706e.2019.90.2246</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Specific habitat requirements and niche conservatism for nine species of the Mexican genus Thelocactus (Cactaceae)]]></article-title>
<article-title xml:lang="es"><![CDATA[Requerimientos específicos de hábitat y conservación de nicho para nueve especies del género mexicano Thelocactus (Cactaceae)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mosco]]></surname>
<given-names><![CDATA[Alessandro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Azienda Sanitaria Universitaria Integrata di Trieste  ]]></institution>
<addr-line><![CDATA[Trieste ]]></addr-line>
<country>Italy</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2019</year>
</pub-date>
<volume>90</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-34532019000100602&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-34532019000100602&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-34532019000100602&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Although Mexican Cactaceae are a significative component of Mexican flora and have a relevant economic and ornamental value, the knowledge of the environmental factors characterizing their niche is still rather limited. This study was aimed at defining the ecological niche and potential distribution of 9 species of the genus Thelocactus. Climatic and topographic variables constraining the distribution of Thelocactus species were identified by means of environmental niche models (ENM) and ordination techniques and used to generate potential distribution maps. The constructed ENMs were compared to assess the similarities of the ecological niche of Thelocactus species and to know if they share the same ecological niche space. The distribution of Thelocactus species was mostly limited by isothermality and precipitation of wettest quarter. The differences in habitat requirements were well documented by the significative differences in the niche ecological space as shown by the equivalency test, while the high percentage of niches that were more similar than expected by chance suggest a high degree of niche conservatism among Thelocactus species. The spatial predictions could serve to improve field design sampling to discover new populations, while niche characteristics could be relevant for improving preservation actions and guiding reintroduction programs for a better conservation of Thelocactus species.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Aunque las cactáceas mexicanas son un componente importante de la flora de México, además de tener gran valor económico y ornamental, el conocimiento de los factores ambientales que caracterizan su nicho es limitado. Este estudio tiene como objetivo definir el nicho ecológico y la distribución potencial de 9 especies del género Thelocactus. Las variables climáticas y topográficas que moldean la distribución de las especies de Thelocactus se identificaron por medio de modelos de nicho ambiental (MNA) y técnicas de ordenación, y fueron usadas para generar mapas de distribución potencial. Los MNA construidos fueron comparados entre sí para evaluar la similitud del nicho ecológico de las especies de Thelocactus y para indagar si comparten el mismo nicho ecológico. La distribución de las especies de Thelocactus está limitada principalmente por la isotermalidad y la precipitación del cuarto más húmedo. Las diferencias en los requerimientos de hábitat estuvieron bien documentadas por las diferencias significativas en el nicho ecológico como se mostró en la prueba de equivalencia, mientras que el alto porcentaje de nichos que fueron más similares que lo esperado por azar, sugiere un alto grado de conservadurismo de nicho entre las especies de Thelocactus. Las predicciones espaciales podrían servir para mejorar estrategias de muestreo en el campo para descubrir nuevas poblaciones, mientras que las características del nicho podrían ser relevantes para optimizar acciones de conservación y para guiar programas de reintroducción para mejorar la conservación de las especies de Thelocactus.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Chihuahuan Desert]]></kwd>
<kwd lng="en"><![CDATA[Niche equivalence]]></kwd>
<kwd lng="en"><![CDATA[Niche similarity]]></kwd>
<kwd lng="en"><![CDATA[Species distribution modeling]]></kwd>
<kwd lng="es"><![CDATA[Desierto Chihuahuense]]></kwd>
<kwd lng="es"><![CDATA[Equivalencia de nicho]]></kwd>
<kwd lng="es"><![CDATA[Similitud de nicho]]></kwd>
<kwd lng="es"><![CDATA[Modelos de distribución de especies]]></kwd>
</kwd-group>
</article-meta>
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