<?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>S1870-34532022000100317</article-id>
<article-id pub-id-type="doi">10.22201/ib.20078706e.2022.93.3705</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Withstanding cold nights at high elevation: thermal strategy of Atractus crassicaudatus, a nocturnal tropical snake endemic to the eastern Andes of Colombia]]></article-title>
<article-title xml:lang="es"><![CDATA[Soportando noches frías a gran altitud: estrategia de termorregulación de Atractus crassicaudatus, una serpiente tropical nocturna, endémica de los Andes orientales de Colombia]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Paternina-Cruz]]></surname>
<given-names><![CDATA[R. Felipe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Calderón-Espinosa]]></surname>
<given-names><![CDATA[Martha L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Colombia Instituto de Ciencias Naturales Grupo de Morfología y Ecología Evolutiva]]></institution>
<addr-line><![CDATA[Bogotá D.C. ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<volume>93</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1870-34532022000100317&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1870-34532022000100317&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1870-34532022000100317&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Thermoregulation in highland tropical environments imposes physiological challenges for reptiles. The interaction between individual thermal requirements with external thermal conditions in these environments remains mostly unknown. We examined the thermal strategy of the nocturnal snake Atractus crassicaudatus (Duméril, Bibron, and Duméril, 1854) in the highlands of the northern Andes. We depicted the relationship between the snake´s body temperatures on the field and under experimental conditions, with operative temperatures during 2 climatic seasons. Additionaly, we compared selected temperatures (Tsel) during the day (photophase) and night (scotophase). Individuals selected different body temperatures under dry (Tsel = 19.53-21.30 °C) and rainy (Tsel = 17.27-19.23 °C) seasons, they actively thermoregulate during the dry season, and they are thermoconformers during the rainy season. Their preference for rocky-shelters in open to semi-open habitats, and the seasonal adjustment of Tsel, suggest thigmothermy with plastic thermal physiology. Individuals select a similar range of temperatures during photophase and scotophase, then, thermoregulatory behavior might occur even during the &#8220;inactivity phase.&#8221; This nocturnal snake copes with the circadian and seasonal variation of environmental thermal quality through behavior and physiological adjustments.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen La termorregulación en la montaña tropical Andina impone retos para los reptiles. La interacción entre los requisitos térmicos de los individuos con las condiciones térmicas externas en estos entornos es poco conocida. Examinamos la estrategia de termorregulación de la serpiente nocturna Atractus crassicaudatus (Duméril, Bibron and Duméril, 1854), en el norte de los Andes. Describimos la relación entre la temperatura corporal de las serpientes, en campo y en laboratorio, con las temperaturas operativas durante 2 temporadas climáticas. Comparamos también la temperatura seleccionada (Tsel) durante la fotofase y la escotofase. Atractus crassicaudatus selecciona temperaturas corporales diferentes entre temporada seca (Tsel = 19.53-21.30 °C) y lluviosa (Tsel = 17.27-19.23 °C); termorregula activamente en seca y es termoconformista en lluvias. El uso de refugios rocosos en hábitat abiertos y semiabierto y el ajuste estacional de la temperatura seleccionada, sugiere tigmotermia y plasticidad en su fisiología térmica. Estas serpientes seleccionan un intervalo similar de temperaturas durante la fotofase y la escotofase, por lo que posiblemente termorregula comportamentalmente aún durante la fase de inactividad. En conclusión, esta serpiente nocturna responde a la variación circadiana y estacional en la calidad térmica de su microambiente mediante ajuste comportamental y fisiológico.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Thickhead ground snake]]></kwd>
<kwd lng="en"><![CDATA[Thermal biology]]></kwd>
<kwd lng="en"><![CDATA[Thermoregulation]]></kwd>
<kwd lng="en"><![CDATA[Seasonal variation]]></kwd>
<kwd lng="en"><![CDATA[Tropical mountains]]></kwd>
<kwd lng="es"><![CDATA[Serpiente sabanera]]></kwd>
<kwd lng="es"><![CDATA[Biología térmica]]></kwd>
<kwd lng="es"><![CDATA[Termorregulación]]></kwd>
<kwd lng="es"><![CDATA[Variación estacional]]></kwd>
<kwd lng="es"><![CDATA[Montañas tropicales]]></kwd>
</kwd-group>
</article-meta>
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