<?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>0034-7744</journal-id>
<journal-title><![CDATA[Revista de Biología Tropical]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. biol. trop]]></abbrev-journal-title>
<issn>0034-7744</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-77442021000301079</article-id>
<article-id pub-id-type="doi">10.15517/rbt.v69i3.47359</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Floristic composition, structure and environmental characterization of Cyathea costaricensis population in a remnant cloud forest in Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[Composición florística, estructura y caracterización ambiental de una población de Cyathea costaricensis en un relicto de bosque mesófilo de montaña en México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Olvera-Vargas]]></surname>
<given-names><![CDATA[Miguel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Figueroa-Rangel]]></surname>
<given-names><![CDATA[Blanca-L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Solís-Robles]]></surname>
<given-names><![CDATA[Christiam]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad de Guadalajara Departamento de Ecología y Recursos Naturales ]]></institution>
<addr-line><![CDATA[ Jalisco]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad de Guadalajara  ]]></institution>
<addr-line><![CDATA[ Jalisco]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2021</year>
</pub-date>
<volume>69</volume>
<numero>3</numero>
<fpage>1079</fpage>
<lpage>1097</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442021000301079&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442021000301079&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442021000301079&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  Introduction:  Tree ferns are significant components of temperate, tropical and subtropical forests, contributing to shape complex forest stand structures.  Objectives:  1) to describe the population structure of Cyathea costaricensis in a remnant cloud forest of West-central Mexico; 2) to characterize and relate the floristic composition and the structure of the most important tree species associated to the C. costaricensis population and; 3) to describe the environment where C. costaricensis occurs.  Methods:  We estimated the Importance Value Index (IVI) to select the most important canopy-dominant species associated to C. costaricensis; we constructed height and Diameter at Breast Height (DBH) frequency distributions for those selected species according to IVI as well as for C. costaricensis population; we computed the asymmetry of the frequency distributions through the coefficient of skewness and the probability density function via the Kernel density estimation. We tested for differences between canopy-dominant tree species and C. costaricensis population structure by the non-parametric Wilcoxon rank sum test.  Results: C. costaricensis individuals presented the smallest heights and intermediate DBH sizes as compared with the canopy-dominant species, with statistically significant differences for height but not for DBH according to the Wilcoxon test. Most of the tree fern individuals were located in uneven terrains and over the base slope of the terrain; canopy openness and Total Radiation Under the Canopy values were similar to those reported for Cyathea species elsewhere.  Conclusions:  We confirm the hypothesis of comparable structure between the canopy-dominant species and the C. costaricensis population only for DBH; on the contrary, for trunk height, there were statistically significant differences; the small heights of C. costaricensis suggest their coexistence in the understory through sheltering from the taller canopy-dominants. Mostly all individuals of C. costaricensis were confined to local environmental conditions, particularly to physiography.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  Introducción:  Los helechos arborescentes son componentes importantes de los bosques templados, tropicales y subtropicales, que contribuyen a dar forma a rodales de estructuras complejas.  Objetivos:  1) Describir la estructura poblacional de Cyathea costaricensis en un remanente de bosque nuboso del centro-oeste de México; 2) Caracterizar y relacionar la composición florística y la estructura de las especies arbóreas más importantes asociadas a la población de C. costaricensis y; 3) Describir el ambiente donde se encuentra C. costaricensis.  Métodos:  Estimamos el Índice de Valor de Importancia (IVI) para seleccionar las especies dominantes más importantes del dosel asociadas a C. costaricensis; para las especies seleccionadas según IVI, construimos distribuciones de frecuencia de alturas y diámetros a la altura del pecho (DAP), así como para la población de C. costaricensis. Calculamos la asimetría de las distribuciones de frecuencia a través del coeficiente de asimetría y la función de densidad de probabilidad mediante la estimación de densidad de Kernel. Probamos las diferencias entre las especies de árboles dominantes en el dosel y la estructura de la población de C. costaricensis mediante la prueba no paramétrica de suma de rangos de Wilcoxon.  Resultados:  los individuos de C. costaricensis presentaron las menores alturas y tamaños intermedios de DAP en comparación con las especies dominantes del dosel, con diferencias estadísticamente significativas para la altura, pero no para el DAP según la prueba de Wilcoxon. La mayoría de los individuos de helechos arborescentes se ubicaron en terrenos irregulares y sobre la pendiente baja del terreno. Los valores de apertura del dosel y Radiación total bajo el dosel fueron similares a los reportados para las especies de Cyathea en otros lugares.  Conclusiones:  Confirmamos la hipótesis de que hay una estructura similar entre las especies dominantes del dosel y la población de C. costaricensis solo para el DAP; por el contrario, para la altura del fuste, hubo diferencias estadísticamente significativas; las pequeñas alturas de C. costaricensis sugieren su coexistencia en el sotobosque a través de la cobertura árboles dominantes del dosel. La mayoría de los individuos de C. costaricensis fueron encontrados confinados a condiciones ambientales locales, en particular a la fisiografía.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[tree ferns]]></kwd>
<kwd lng="en"><![CDATA[population structure]]></kwd>
<kwd lng="en"><![CDATA[canopy species composition]]></kwd>
<kwd lng="en"><![CDATA[reversed J-shaped]]></kwd>
<kwd lng="en"><![CDATA[height categories]]></kwd>
<kwd lng="en"><![CDATA[local environment.]]></kwd>
<kwd lng="es"><![CDATA[helechos arborescentes]]></kwd>
<kwd lng="es"><![CDATA[estructura poblacional]]></kwd>
<kwd lng="es"><![CDATA[composición de especies del dosel]]></kwd>
<kwd lng="es"><![CDATA[forma de J invertida]]></kwd>
<kwd lng="es"><![CDATA[categorías de altura]]></kwd>
<kwd lng="es"><![CDATA[ambiente local.]]></kwd>
</kwd-group>
</article-meta>
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