<?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>1026-8774</journal-id>
<journal-title><![CDATA[Revista mexicana de ciencias geológicas]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. cienc. geol]]></abbrev-journal-title>
<issn>1026-8774</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Geología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1026-87742016000200157</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Feeding ecology and habitat of Late Pleistocene Equus horses from west-central Mexico using carbon and oxygen isotopes variation]]></article-title>
<article-title xml:lang="es"><![CDATA[Ecología alimentaria y el hábitat de los caballos Equus del Pleistoceno tardío en el centro-occidente de México a partir de la variación isotópica del carbono y oxígeno]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Marin-Leyva]]></surname>
<given-names><![CDATA[Alejandro H.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arroyo-Cabrales]]></surname>
<given-names><![CDATA[Joaquín]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Zepeda]]></surname>
<given-names><![CDATA[María Luisa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ponce-Saavedra]]></surname>
<given-names><![CDATA[Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Schaaf]]></surname>
<given-names><![CDATA[Peter]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-Crespo]]></surname>
<given-names><![CDATA[Víctor Adrian]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Morales-Puente]]></surname>
<given-names><![CDATA[Pedro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cienfuegos-Alvarado]]></surname>
<given-names><![CDATA[Edith]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alberdi]]></surname>
<given-names><![CDATA[María Teresa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Michoacana de San Nicolás de Hidalgo Facultad de Biología Laboratorio de Paleontología]]></institution>
<addr-line><![CDATA[Morella Michoacán]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Instituto Nacional de Antropología e Historia Subdirección de Laboratorios y Apoyo Académico ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Michoacana de San Nicolás de Hidalgo Facultad de Biología ]]></institution>
<addr-line><![CDATA[Morella Michoacán]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geofísica ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,Benemérita Universidad Autónoma de Puebla Escuela de Biología ]]></institution>
<addr-line><![CDATA[ Puebla]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,Universidad Nacional Autónoma de México Instituto de Geología ]]></institution>
<addr-line><![CDATA[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af7">
<institution><![CDATA[,CSIC Museo Nacional de Ciencias Naturales ]]></institution>
<addr-line><![CDATA[Madrid ]]></addr-line>
<country>Spain</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2016</year>
</pub-date>
<volume>33</volume>
<numero>2</numero>
<fpage>157</fpage>
<lpage>169</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1026-87742016000200157&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1026-87742016000200157&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1026-87742016000200157&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Using carbon and oxygen stable isotopes we analyzed the diet and habitat of three Late Pleistocene horses (Equus mexicanus, E. conversidens and E. cedralensis) from two localities in west-central Mexico. Our objective was to evaluate dietary adaptability and resource partitioning, which would reflect the environmental conditions of the localities on which horses fed, and would support the ecological scenario predicted from morphology and ecomorphology. Our preliminary results show the presence of two feeding styles in La Cinta-Portalitos, indicating some resource partition and a more diverse environment: one of E. mexicanus with a diet composed by C3/C4 plants, and another one of E. conversidens and E. cedralensis with high consumption of C4 plants. Contrastingly, in La Piedad-Santa Ana only one feeding group was present, in which the three horse species fed mainly on C4 plants, thus possibly demonstrating the absence of resource partitioning and the abundance of a single food plant resource for horses. The major dietary variation we recorded was in E. mexicanus, followed by that in E. cedralensis and E. conversidens, which evidences that in the past, horses exhibited a more diverse diet related both to an eclectic behavior and to the varied environmental conditions in which they lived. We also found that the ecological predictions (habitat) based on ecomorphological characteristics were supported for some populations, but not for others; this indicates a complex relation between body mass, limb proportions and diet, more research being needed for better understanding of this relation. Finally, our results suggest a highly heterogeneous habitat with a mixture of C3 and C4 plants in La Cinta-Portalitos, and a more open scenario with a higher diversity of C4 plants and presence of woody vegetation of C3 plants in La Piedad-Santa Ana.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN A partir de datos de isótopos estables de carbono y oxígeno se analizan la dieta &#947; el hábitat de tres especies de caballos del Pleistoceno tardío (Equus mexicanus, E. conversidens y E. cedralensis) en dos localidades del centro occidente de México. El objetivo fue encontrar la capacidad de adaptación a la dieta y la partición de los recursos, lo que reflejaría las condiciones ambientales de las localidades que utilizaban para alimentarse, y apoyaría la ecología predicha por la morfología y ecomorfología. Los resultados muestran la presencia de dos tipos de alimentación en La Cinta-Portalitos, uno conformado por E. mexicanus con una dieta compuesta por plantas C3/C4y otro por E. conversidens y E. cedralensis con un alto consumo de plantas C4, indicando partición de recursos y un ambiente más diverso, mientras que para La Piedad-Santa Ana sólo se identificó un grupo alimentario conformado por las tres especies, con una dieta principalmente compuesta por plantas C4 lo que demostraría la no partición de recursos o la abundancia de uno. E. mexicanus exhibe la mayor variación alimentaria, seguido por E. cedralensis y E. conversidens, lo cual evidencia que algunos caballos pasado tenían una dieta más diversa relacionada con un comportamiento más ecléctico y que variaba con las condiciones ambientales en las que vivían. Se encontró que las predicciones ecológicas (hábitat) con base en características ecomorfológicas se cumplían en algunas poblaciones, sin embargo en otras no, por lo que la relación entre la masa corporal, las proporciones de las extremidades y la dieta es compleja y serían necesarios más estudios para su mejor entendimiento. Finalmente, los resultados sugieren un hábitat altamente heterogéneo con una mezcla de plantas C3y C4 para La Cinta-Portalitos, y un escenario más abierto con una diversidad de plantas C4 más alta y con la presencia de vegetación leñosa de plantas C3 en La Piedad-Santa Ana]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Mexican horses]]></kwd>
<kwd lng="en"><![CDATA[Rancholabrean]]></kwd>
<kwd lng="en"><![CDATA[stable isotopes]]></kwd>
<kwd lng="en"><![CDATA[&#948;13&#1057;]]></kwd>
<kwd lng="en"><![CDATA[&#948;18O]]></kwd>
<kwd lng="en"><![CDATA[resource partitioning]]></kwd>
<kwd lng="es"><![CDATA[Caballos mexicanos]]></kwd>
<kwd lng="es"><![CDATA[Rancholabreano]]></kwd>
<kwd lng="es"><![CDATA[isótopos estables]]></kwd>
<kwd lng="es"><![CDATA[&#948;13&#1057;]]></kwd>
<kwd lng="es"><![CDATA[&#948;18O]]></kwd>
<kwd lng="es"><![CDATA[partición de recursos]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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