<?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>2007-4298</journal-id>
<journal-title><![CDATA[Botanical Sciences]]></journal-title>
<abbrev-journal-title><![CDATA[Bot. sci]]></abbrev-journal-title>
<issn>2007-4298</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Botánica de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-42982021000100001</article-id>
<article-id pub-id-type="doi">10.17129/botsci.2658</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Species delimitation in the genus Quercus (Fagaceae)]]></article-title>
<article-title xml:lang="es"><![CDATA[Delimitación de especies en el género Quercus (Fagaceae)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Valencia-A.]]></surname>
<given-names><![CDATA[Susana]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Departamento de Biología Comparada Herbario de la Facultad de Ciencias]]></institution>
<addr-line><![CDATA[ Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2021</year>
</pub-date>
<volume>99</volume>
<numero>1</numero>
<fpage>1</fpage>
<lpage>12</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-42982021000100001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-42982021000100001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-42982021000100001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background: Quercus is recognized as a taxonomically complex genus, but also as a model clade in many important fields in biology, such that a good recognition of its species is necessary. The chosen species concept to use in Quercus will determine the empirical criteria used to recognize them, which will impact several areas of knowledge.  Questions:  What are the main sources of variation that hinder the delimitation of species in Quercus? What species concepts we use explicitly to recognize species in Quercus? What is the advantage of using different empirical criteria both integrally and simultaneously in delimitation of species of oaks?  Studied species:  Species of Quercus  Method:  Bibliographic review of the main sources of variation in Quercus, and the species concepts, specifically those used in Quercus.  Results:  Plasticity, convergence, hybridization and introgression, and incomplete divergence were identified as the main sources of variation in oaks. Taxonomic and ecological species concepts are those mainly and traditionally used in Quercus. Syngameons are important to know and understand the biology and evolution of Quercus species. These systems indicate that there are preserved genes that provide coherence and morphologic, ecologic and genetic identity to species, even if hybridization, backcrossing and introgression occur.  Conclusions: Preserved genes that provide coherence to species, suggest using taxonomic, ecologic and genetic concepts to delimit problematic species in species complexes in Quercus. The simultaneous use of data that these concepts support (multicriteria analysis), will give more confidence to get closer to the nature of the species and build an integrative taxonomy.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Antecedentes: Quercus es reconocido como un género taxonómicamente complejo, pero también como un clado modelo, implicando un buen conocimiento y reconocimiento de sus especies. El concepto de especie utilizado en Quercus repercutirá en los criterios empíricos empleados para reconocer especies y en los resultados de su aplicación en diferentes campos.  Preguntas:  ¿Cuáles son las principales fuentes de variación que dificultan delimitar especies en Quercus? ¿Cuáles conceptos de especie usamos para reconocer especies en este género? ¿Cuál es la ventaja de utilizar múltiples criterios empíricos simultaneamente para delimitar las especies de encinos?  Especies estudiadas:  Especies de Quercus  Método:  Revisión bibliográfica de las principales fuentes de variación en Quercus y de conceptos de especie, enfatizando en los usados en Quercus.  Resultados:  Se identificó a la plasticidad, convergencia, hibridación e introgresión y divergencia incompleta como las principales fuentes de variación en encinos. Los principales conceptos de especie tradicionalmente utilizados en Quercus son el taxonómico y ecológico. Los singameones son importantes en el conocimiento y entendimiento de la biología y evolución de las especies de Quercus. Estos sistemas permiten conocer que hay genes conservados que proporcionan coherencia, así como identidad morfológica, ecológica y genética a las especies, aun cuando se presente hibridación, retrocruza e introgresión.  Conclusiones: Los genes que proporcionan coherencia a las especies sugieren utilizar los conceptos taxonómico, ecológico y genético en las especies problemáticas del género Quercus. El uso simultaneo de los datos que estos conceptos respaldan, darán más confianza para acercarnos a la naturaleza de las especies y construir una taxonomía integrativa.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Criteria to delimiting species]]></kwd>
<kwd lng="en"><![CDATA[nomenclature]]></kwd>
<kwd lng="en"><![CDATA[species concepts]]></kwd>
<kwd lng="en"><![CDATA[taxonomy]]></kwd>
<kwd lng="es"><![CDATA[Conceptos de especie]]></kwd>
<kwd lng="es"><![CDATA[criterios para delimitar especies]]></kwd>
<kwd lng="es"><![CDATA[nomenclatura]]></kwd>
<kwd lng="es"><![CDATA[taxonomía]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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