<?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>S1870-34532023000101001</article-id>
<article-id pub-id-type="doi">10.22201/ib.20078706e.2023.94.3999</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Reproductive effort in two viviparous species of blue-tailed skinks (Squamata: Scincidae: Plestiodon) from Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[Esfuerzo reproductor en dos especies vivíparas de esquincos de cola azul (Squamata: Scincidae: Plestiodon) de México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Muñoz-Nolasco]]></surname>
<given-names><![CDATA[Francisco Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
<xref ref-type="aff" rid="Aaf"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arenas-Moreno]]></surname>
<given-names><![CDATA[Diego Miguel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cruz-Sáenz]]></surname>
<given-names><![CDATA[Daniel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Méndez-de la Cruz]]></surname>
<given-names><![CDATA[Fausto Roberto]]></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 Zoología]]></institution>
<addr-line><![CDATA[ Ciudad de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Ecología Laboratorio de Interacción Planta-Atmósfera]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma de Guerrero Facultad de Ciencias Químico-Biológicas ]]></institution>
<addr-line><![CDATA[ Guerrero]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad de Guadalajara Centro Universitario de Ciencias Biológicas y Agropecuarias ]]></institution>
<addr-line><![CDATA[Zapopan Jalisco]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<volume>94</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-34532023000101001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-34532023000101001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-34532023000101001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract The relative allocation of energy organisms devote to reproductive processes (aka reproductive effort) constitutes a central topic in life history theory. We document some aspects of the reproductive ecology and investment of 2 viviparous skinks of the genus Plestiodon from Mexico: an undescribed species previously assigned to P. brevirostris (Plestiodon sp., La Malinche, Tlaxcala, 2,700-3,000 m) and P. dugesii (2 populations, Mazamitla and Tapalpa, Jalisco; 2,400-2,500 m). We used relative litter mass (RLM) as a measure of reproductive effort and calculated a body condition index (BCI) as a proxy of the energy status of non-pregnant females, post-parturient females, and neonates. There were no differences in any of the reproductive characteristics between the 2 populations of P. dugesii. Both species lacked sexual size dimorphism, and female body size did not influence RLM, litter size nor litter mass. However, female BCI influenced RLM and, in P. dugesii, a larger litter size correlated with a lower BCI of neonates. Despite their overall similarities in reproductive investment, there seem to be differential selective pressures shaping offspring characteristics of these 2 lizard species.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La asignación relativa de energía que los organismos destinan a los procesos reproductores (esfuerzo reproductor) constituye un tema central en la teoría de historias de vida. Documentamos algunos aspectos de la ecología e inversión reproductora de 2 especies de esquincos vivíparos del género Plestiodon de México, una especie no descrita previamente asignada a P. brevirostris (Plestiodon sp., La Malinche, Tlaxcala, 2,700-3,000 m) y P. dugesii (2 poblaciones, Mazamitla y Tapalpa, Jalisco, 2,400-2,500 m). Usamos la masa relativa de camada (MRC) como medida del esfuerzo reproductor y calculamos un índice de condición corporal (ICC) como aproximación del estado energético de hembras no gestantes, posparturientas y neonatos. No hubo diferencias en las características reproductoras de las 2 poblaciones de P. dugesii. Ninguna especie presentó dimorfismo sexual en la talla y la talla de la hembra no influyó sobre la MRC ni en el tamaño o en la masa de la camada. El ICC de las hembras influyó sobre la MRC y, en P. dugesii, el tamaño de camada se correlacionó negativamente con el ICC de neonatos. Pese a las semejanzas generales en inversión reproductora, parece haber presiones selectivas diferenciales que moldean las características de las crías de estas 2 especies.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Life-history traits]]></kwd>
<kwd lng="en"><![CDATA[Relative litter mass]]></kwd>
<kwd lng="en"><![CDATA[Trade-off]]></kwd>
<kwd lng="en"><![CDATA[Body condition index]]></kwd>
<kwd lng="es"><![CDATA[Características de historia de vida]]></kwd>
<kwd lng="es"><![CDATA[Masa relativa de camada]]></kwd>
<kwd lng="es"><![CDATA[Trade-off]]></kwd>
<kwd lng="es"><![CDATA[Índice de condición corporal]]></kwd>
</kwd-group>
</article-meta>
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