<?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>S2007-33642018000200113</article-id>
<article-id pub-id-type="doi">10.12933/therya-18-552</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Annual cycle of the mexican ground squirrel (Xerospermophilus perotensis)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Montero-Bagatella]]></surname>
<given-names><![CDATA[Sandra Helena]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González-Romero]]></surname>
<given-names><![CDATA[Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez-Rojas]]></surname>
<given-names><![CDATA[Gerardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gallina]]></surname>
<given-names><![CDATA[Sonia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto de Ecología A. C.  ]]></institution>
<addr-line><![CDATA[Xalapa Veracruz]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma del Estado de Hidalgo  ]]></institution>
<addr-line><![CDATA[Pachuca Hidalgo]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2018</year>
</pub-date>
<volume>9</volume>
<numero>2</numero>
<fpage>113</fpage>
<lpage>120</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-33642018000200113&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-33642018000200113&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-33642018000200113&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Seasonality and changes in climate and habitat dynamics lead ground squirrels to use resources during the most favorable seasons and avoid less favorable conditions by hibernating. The Perote ground squirrel (Xerospermophilus perotensis) is nationally and internationally classified as vulnerable to extinction; however, our knowledge of this species is scant. The aim of this study was to describe and analyze its annual cycle. Temperature and rainfall data (2008 to 2014) for the area were used. Animal frequencies were obtained for seven sites by capture-mark-recapture; captured animals were marked, and their sex, weight, age and reproductive status noted. Population structure was obtained for each site using the male:female sex ratio and age structure. Activity during the annual cycle is statistically associated with temperature. Scrotal males were most abundant while females with signs of pregnancy and those lactating were recorded least often. The number of adults and juveniles differed statistically, with adults more abundant throughout the study. Weight varied throughout the study, and differed between adults and juveniles. The Perote ground squirrel exhibits phenological patterns similar to those of species of the genus Spermophilus, which respond to changes in temperature and its activity cycle begins in spring and ends in autumn. The weight of the squirrels was dynamic, probably resulting from reproduction, hibernation and their response to changes in environmental resources. The frequency of this species was low, with few juveniles recorded, indicating that X. perotensis is facing serious problems, likely from severe anthropogenic pressure and its own ecological characteristics.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: La estacionalidad y dinamismo del clima y hábitat inducen a que las ardillas terrestres exploten los recursos en las mejores estaciones y eviten la menos favorable a través de la hibernación. La ardilla endémica de Perote (Xerospermophilus perotensis) se encuentra clasificada a nivel nacional e internacional como vulnerable a la extinción, ya que su hábitat se ha reducido drásticamente por lo que su conservación se ha visto comprometida, a pesar de esto el conocimiento acerca de la especie es escaso. El objetivo de este estudio fue describir y analizar la fenología de la especie. Se obtuvieron las temperaturas y precipitaciones del área de estudio del año 2008 al 2014; la frecuencia de capturas se obtuvo a través del método de captura-marcaje-recaptura. Los animales capturados fueron marcados y se registró el sexo, edad, peso y estado reproductivo en el que se encontraban. La estructura poblacional se obtuvo para cada sitio usando la proporción de sexos, edad y estado reproductivo. Los resultados indicaron que la actividad durante el ciclo anual está relacionada estadísticamente con la temperatura, ya que cuando desciende ocurre la hibernación; así como de las condiciones reproductivas debido a que se presentaron cuando las temperaturas fueron las más altas. En lo que respecta a las características reproductivas, los machos escrotados fueron los más abundantes y las hembras con signos de preñez o lactantes fueron las menos registradas. Para la categoría de edad, el número de adultos y juveniles difirieron estadísticamente, siendo los adultos los más abundantes. Con relación al peso de las ardillas, fue variable a lo largo del estudio y sólo existió diferencia estadística entre el peso de los adultos y juveniles. La ardilla de Perote exhibe patrones fenológicos similares a las del género Spermophilus, ya que la especie responde a los cambios de temperatura y la actividad de su ciclo empieza en la primavera y termina en el otoño. El peso de los organismos fue dinámico, probablemente causado por la reproducción, hibernación y por su respuesta a los cambios en los recursos ambientales. En general, las frecuencias de los organismos fueron bajas y con pocos registros de juveniles, lo que indica que la especie está enfrentando serios problemas para persistir debido a las severas presiones antropogénicas a las que se enfrenta y a sus propias características ecológicas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[ground squirrel]]></kwd>
<kwd lng="en"><![CDATA[hibernation]]></kwd>
<kwd lng="en"><![CDATA[phenology]]></kwd>
<kwd lng="en"><![CDATA[reproductive characteristics]]></kwd>
<kwd lng="en"><![CDATA[temperature]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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