<?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>S2007-42982021000400938</article-id>
<article-id pub-id-type="doi">10.17129/botsci.2768</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Transition zones and biogeographic characterization of endemism in three biogeographic provinces of central Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[Zonas de transición y caracterización biogeográfica del endemismo en tres provincias biogeográficas del centro de México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villaseñor]]></surname>
<given-names><![CDATA[José Luis]]></given-names>
</name>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortiz]]></surname>
<given-names><![CDATA[Enrique]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Juárez]]></surname>
<given-names><![CDATA[Diego]]></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 Departamento de Botánica]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<volume>99</volume>
<numero>4</numero>
<fpage>938</fpage>
<lpage>954</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-42982021000400938&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-42982021000400938&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-42982021000400938&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Background:  Sites of overlap in the species distribution among regions are known as transition zones. Their floristic and biogeographic complexity is rarely discussed.  Questions:  Is it possible to identify transition zones amid the biogeographic provinces of Mexico? Can transition zones also be considered areas of endemism?  Study species:  315 Asteraceae taxa endemic to Mexico.  Study site: Volcanic Belt, Balsas Depression and Sierra Madre del Sur biogeographic provinces.  Methods:  For species of Asteraceae endemic to three biogeographic provinces of central Mexico, we characterized the province to which each species belonged and estimated the distance it could penetrate the neighboring province. We defined transition zones between biogeographic provinces as the average penetration distances of the species. We also evaluated the presence of species with restricted distribution to transition zones.  Results:  Two transition zones were identified in the Balsas Depression, first, at the junction with the Volcanic Belt with a width of 13 km, and second, with the Sierra Madre del Sur, with a width of 12.3 km. There were 45 species whose distribution was restricted to those transition zones.  Conclusions:  Understanding how richness and endemism are exchanged from one region to another is essential to explain how their floras have been assembling and evolving. This analysis has allowed us to better understand the relationships among regions as complex as those studied here.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Antecedentes: Los sitios de sobreposición en la distribución de especies entre regiones son conocidas como zonas de transición. Su complejidad florística y biogeográfica rara vez es discutida.  Preguntas: ¿Es posible identificar zonas de transición entre las provincias biogeográficas de México? ¿Las zonas de transición pueden ser consideradas también áreas de endemismo?  Especies de estudio: 315 taxones endémicos de México de la familia Asteraceae.  Sitio de estudio:  Provincias biogeográficas, Eje Volcánico, Depresión del Balsas y Sierra Madre del Sur.  Métodos: Se consideraron las especies endémicas de la familia Asteraceae presentes en tres provincias biogeográficas del centro de México. Se caracterizó a cada especie como perteneciente a cada provincia y posteriormente se estimó la distancia que podía penetrar en la provincia vecina. Las zonas de transición entre las provincias biogeográficas se definieron como el promedio de las distancias de penetración de las especies. Se evaluó la presencia de especies con distribución restringida a las zonas de transición.  Resultados: Se identificaron dos zonas de transición en la Depresión del Balsas, la primera, en la unión con el Eje Volcánico, con una amplitud de 13 km y la segunda, sobreponiéndose con la Sierra Madre del Sur, con una amplitud de 12.3 km. Dentro de ellas se registró la presencia de 45 especies con distribución restringida.  Conclusiones: Comprender cómo se intercambia la riqueza y el endemismo de una región a otra es fundamental para explicar el ensamble y evolución de sus floras. El análisis presentado muestra las relaciones entre regiones tan complejas como las aquí estudiadas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Asteraceae]]></kwd>
<kwd lng="en"><![CDATA[Balsas Depression]]></kwd>
<kwd lng="en"><![CDATA[Biogeographic provinces]]></kwd>
<kwd lng="en"><![CDATA[Endemism]]></kwd>
<kwd lng="en"><![CDATA[Sierra Madre del Sur]]></kwd>
<kwd lng="en"><![CDATA[Volcanic Belt]]></kwd>
<kwd lng="es"><![CDATA[Asteraceae]]></kwd>
<kwd lng="es"><![CDATA[Eje Volcánico]]></kwd>
<kwd lng="es"><![CDATA[Endemismo]]></kwd>
<kwd lng="es"><![CDATA[Depresión del Balsas]]></kwd>
<kwd lng="es"><![CDATA[Provincias biogeográficas]]></kwd>
<kwd lng="es"><![CDATA[Sierra Madre del Sur]]></kwd>
</kwd-group>
</article-meta>
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