<?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>2007-3364</journal-id>
<journal-title><![CDATA[Therya]]></journal-title>
<abbrev-journal-title><![CDATA[Therya]]></abbrev-journal-title>
<issn>2007-3364</issn>
<publisher>
<publisher-name><![CDATA[Asociación Mexicana de Mastozoología A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-33642025000100077</article-id>
<article-id pub-id-type="doi">10.12933/therya-25-6141</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Hybrid zone between Ctenomys lami and C. minutus: habitat alterations influence the evolutionary history of two burrowing rodent species of southern Brazil]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Freitas]]></surname>
<given-names><![CDATA[Thales R. O. de]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ximenes]]></surname>
<given-names><![CDATA[Simone S. F.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidade Federal do Rio Grande do Sul Instituto de Biociências Departamento de Genética]]></institution>
<addr-line><![CDATA[Porto Alegre Rio Grande do Sul]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2025</year>
</pub-date>
<volume>16</volume>
<numero>1</numero>
<fpage>77</fpage>
<lpage>89</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-33642025000100077&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-33642025000100077&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-33642025000100077&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Hybridization events provide insights into central questions in evolutionary biology regarding the role of reproductive isolation in speciation mechanisms. Because of that, there is increasing interest in understanding the patterns and processes underlying hybrid zones. The sister species Ctenomys minutus (2n = 48a) and Ctenomys lami (2n = 56) are burrowing rodents endemic to the southern Brazilian coastal plain and collectively exhibit high karyotype polymorphism. We analyzed chromosomal and mitochondrial DNA (mtDNA) variation to assess their evolutionary history and confirm and characterize an interspecific hybrid zone between the species. Despite the absence of reciprocal monophyly of mtDNA lineages, C. minutus and C. lami maintain distinct geographical distributions as well as cytogenetic and morphological differences, suggesting that these incipient species are in the early stages of evolutionary differentiation. The 19 hybrid individuals we include in this analysis show intermediate karyotypic forms between the parental types. These admixed individuals all shared the same mtDNA haplotype that is otherwise only found in C. minutus. Although C. minutus and C. lami are incipient species, their unique differences require distinct conservation efforts. Conservation efforts should focus on maintaining the integrity of pure populations of both species and minimizing anthropogenically induced hybridization.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Los eventos de hibridación brindan información sobre cuestiones centrales en biología evolutiva con respecto al papel del aislamiento reproductivo en los mecanismos de especiación. Debido a eso, existe un creciente interés en comprender los patrones y procesos subyacentes a las zonas híbridas. Las especies hermanas Ctenomys minutus (2n = 48a) y Ctenomys lami (2n = 56) son roedores excavadores endémicos de la llanura costera del sur de Brasil y colectivamente exhiben un alto polimorfismo cariotípico. Analizamos la variación cromosómica y del ADN mitocondrial (ADNmt) para evaluar su historia evolutiva y confirmar y caracterizar una zona híbrida interespecífica entre las especies. A pesar de la ausencia de monofilia recíproca de linajes de ADNmt, C. minutus y C. lami mantienen distribuciones geográficas distintas, así como diferencias citogenéticas y morfológicas, lo que sugiere que estas especies incipientes están en las primeras etapas de la diferenciación evolutiva. Los 19 individuos híbridos que incluimos en este análisis muestran formas cariotípicas intermedias entre los tipos parentales. Todos estos individuos mezclados compartían el mismo haplotipo de ADNmt que, de otro modo, solo se encuentra en C. minutus. Aunque C. minutus y C. lami son especies incipientes, sus diferencias únicas requieren esfuerzos de conservación específicos. Los esfuerzos de conservación deben centrarse en mantener la integridad de las poblaciones puras de ambas especies y minimizar la hibridación inducida antropogénicamente.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Allopatry]]></kwd>
<kwd lng="en"><![CDATA[chromosomal polymorphism]]></kwd>
<kwd lng="en"><![CDATA[cyto-nuclear genome discordance]]></kwd>
<kwd lng="en"><![CDATA[hybrid zone]]></kwd>
<kwd lng="en"><![CDATA[incomplete lineage sorting]]></kwd>
</kwd-group>
</article-meta>
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