<?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>0120-548X</journal-id>
<journal-title><![CDATA[Acta Biológica Colombiana]]></journal-title>
<abbrev-journal-title><![CDATA[Acta biol.Colomb.]]></abbrev-journal-title>
<issn>0120-548X</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia, Facultad de Ciencias, Departamento de Biología]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-548X2021000100042</article-id>
<article-id pub-id-type="doi">10.15446/abc.v26n1.82875</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[VARIATION IN THE FLOWERING PHENOLOGY OF AN EPIPHYTIC BROMELIAD ALONG AN ELEVATIONAL GRADIENT]]></article-title>
<article-title xml:lang="es"><![CDATA[Variación en la fenología de floración de una bromelia epífita a lo largo de un gradiente de elevación]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-López]]></surname>
<given-names><![CDATA[Judith Isabel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Parra-Tabla]]></surname>
<given-names><![CDATA[Víctor]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mondragón]]></surname>
<given-names><![CDATA[Demetria]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Politécnico Nacional Centro Interdisciplinario de Investigación para el Desarrollo Integral Regional ]]></institution>
<addr-line><![CDATA[Santa Cruz Xoxocotlán Oaxaca]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma de Yucatán  ]]></institution>
<addr-line><![CDATA[Mérida Yucatán]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2021</year>
</pub-date>
<volume>26</volume>
<numero>1</numero>
<fpage>42</fpage>
<lpage>53</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-548X2021000100042&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-548X2021000100042&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-548X2021000100042&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Elevational patterns in flowering phenology have been reported for trees, shrubs and herbs. However, for vascular epiphytes that rely on atmospheric sources for humidity and nutrients, and depend on phorophyte microhabitat, elevational patterns of variation are unknown. In this study, we described the flowering phenology of Tillandsia carlos-hankii, an epiphytic bromeliad, along an elevational gradient in Capulálpam de Méndez, Oaxaca. We analyzed the onset, seasonality and duration of flowering along and within different elevation zones, and we evaluated the effect of phorophyte features (tree height, DBH and canopy diameter) on flowering start date and duration. From June 2016 to May 2017, we periodically recorded phenological data from six populations along three elevation zones ("low": 2151 to 2283 m. a. s. l., "medium": 2284 to 2416 m. a. s. l. and "high": 2417 to 2548 m. a. s. l.), monitoring two population per zone. Start of flowering occurred between December and January, beginning six to 16 days earlier at low elevations than in the other zones, although this difference was not statistically significant. We observed marked flowering seasonality at all the elevation zones, with differences between zones (W&#8805;18.49, p&#8804;0.0001) and between the populations at medium and high elevations (W&#8805;8.57, p&#8804;0.05). Flowering duration spanned from December to May. Phorophyte features were not related to the onset or duration of flowering (t&#8804;-1.47, p&#8805;0.14, in all cases). Our results suggest that vascular epiphytes follow the same elevational patterns in phenology as other life forms, and that populations in the same elevation range can vary. The causes of such intra-elevational variation merit further investigation.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Se han reportado los patrones altitudinales en la fenología de floración para árboles, arbustos y hierbas. Sin embargo, para epífitas vasculares, que dependen de fuentes atmosféricas para la humedad y los nutrientes, y del microhábitat del forofito, los patrones de variación en gradientes de elevación se desconocen. Se describe la fenología de floración de Tillandsia carlos-hankii, una bromelia epífita, en un gradiente de elevación en Capulálpam de Méndez, Oaxaca. Se analiza el inicio, estacionalidad y duración de su floración entre y dentro de diferentes elevaciones y se evalúa también el efecto del forofito (altura, DAP y diámetro de copa) sobre el inicio y la duración de la floración. De junio de 2016 a mayo de 2017, se monitorearon individuos localizados en seis poblaciones en tres elevaciones (bajo: 2151-2283 m. s. n. m., medio: 2284-2416 m. s. n. m., alto: 2417-2548 m. s. n. m.), dos poblaciones por zona. El inicio de la floración ocurrió entre diciembre y enero, empezando de seis a 16 días antes en la elevación baja que en las otras, aunque estas diferencias no fueron significativas. Hubo una marcada estacionalidad en todas las zonas de elevación, con diferencias entre elevaciones (W&#8805;18,49, p&#8804;0,0001) y entre poblaciones de media y alta elevación (W&#8805;8,57, p&#8804;0,05). La floración duró de diciembre a mayo. Las características del forofito no estuvieron relacionadas con el inicio ni la duración de la floración (t&#8804;-1,47, p&#8805;0,14, en todos los casos). Los resultados sugieren que las epífitas vasculares siguen el mismo patrón fenológico altitudinal de otras formas de vida, y que las poblaciones en un misma elevación altitudinal pueden variar. Las causas de tal variación intra-altitudinal merecen mayor investigación.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[altitudinal gradient]]></kwd>
<kwd lng="en"><![CDATA[Bromeliaceae]]></kwd>
<kwd lng="en"><![CDATA[vascular epiphytes]]></kwd>
<kwd lng="en"><![CDATA[pine forest]]></kwd>
<kwd lng="es"><![CDATA[bosque de pino]]></kwd>
<kwd lng="es"><![CDATA[Bromeliaceae]]></kwd>
<kwd lng="es"><![CDATA[epífitas vasculares]]></kwd>
<kwd lng="es"><![CDATA[gradiente altitudinal]]></kwd>
</kwd-group>
</article-meta>
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