<?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>0187-7151</journal-id>
<journal-title><![CDATA[Acta botánica mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Act. Bot. Mex]]></abbrev-journal-title>
<issn>0187-7151</issn>
<publisher>
<publisher-name><![CDATA[Instituto de Ecología A.C., Centro Regional del Bajío]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-71512023000100103</article-id>
<article-id pub-id-type="doi">10.21829/abm130.2023.2134</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Host-mediated effects on fruit size variation of the hemiparasitic mistletoe Psittacanthus schiedeanus (Loranthaceae)]]></article-title>
<article-title xml:lang="es"><![CDATA[Efectos mediados por hospedero en la variación del tamaño de frutos del muérdago hemiparásito Psittacanthus schiedeanus (Loranthaceae)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ornelas]]></surname>
<given-names><![CDATA[Juan Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vásquez-Aguilar]]></surname>
<given-names><![CDATA[Antonio Acini]]></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>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<numero>130</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-71512023000100103&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-71512023000100103&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-71512023000100103&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Background and Aims: Most fruits of Psittacanthus mistletoes (Loranthaceae) depend on frugivorous birds for seed dispersal, and their spatial distribution patterns within and between hosts are strongly influenced by the behavior of seed dispersers. Despite the importance of birds in their dispersal and distribution, the effects of host species on fruit size variation have not been investigated to any large extent. The aim of this study was to characterize fruit size variation of Psittacanthus schiedeanus ripe fruits growing on different host species. We expect that the fruit size traits will vary according to the quality of host species, and that this variation will correspond to those in mistletoe reproductive success.  Methods:  Fully ripe fruits from Psittacanthus schiedeanus mistletoe plants growing on different host tree species were collected at two locations (Tlalnelhuayocan and Coapexpan) of cloud forest in central Veracruz, Mexico, measured (length and width and length of cupular pedicels) and weighed to describe fruit size differences.  Key results:  Cupular pedicel length and fruit size were significantly affected by host species. On average, longest cupular pedicels and larger fruits were found on plants growing on naturally growing Acacia pennatula, Quercus germana, Ostrya virginiana and Liquidambar styraciflua, whereas the smaller ones were found generally on cultivated host trees.  Conclusions:  The results provide us with valuable information for further species comparisons regarding the effects of host species on fruit size variation. Although the effects of host species on fruit size variation might vary across space, fruit size differences might be the result of host-resource differences. Further study on fruit selection and fruit handling by seed dispersers is needed to discuss whether the observed fruit size variation correlates with fruit selection and handling by main consumers, and with successful attachment and establishment to host branch after gut passage.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Antecedentes y Objetivos:  La mayoría de los frutos de los muérdagos de Psittacanthus (Loranthaceae) para la dispersión de sus semillas dependen de las aves frugívoras, y el comportamiento de estos dispersores influye en sus patrones de distribución espacial dentro y entre hospederos. A pesar de la importancia de las aves en su dispersión y distribución, los efectos de la especie de hospedero en la variación del tamaño de los frutos no han sido investigados de manera extensa. El objetivo de este estudio fue caracterizar la variación del tamaño de los frutos maduros de Psittacanthus schiedeanus que crecen en diferentes especies de hospedero. Esperamos que los rasgos del tamaño de los frutos varíen de acuerdo con la calidad de la especie del hospedero, y que esta variación se corresponda con la del éxito reproductivo del muérdago.  Métodos:  Frutos maduros de plantas de muérdagos Psittacanthus schiedeanus creciendo en especies diferentes de árboles hospederos fueron colectados en dos sitios (Tlalnelhuayocan y Coapexpan) de bosque mesófilo de montaña en el centro de Veracruz, México, medidos (largo y ancho y largo de los pedicelos cupulares) y pesados para describir las diferencias en su tamaño.  Resultados clave:  La longitud del pedicelo cupular y el tamaño del fruto se vieron significativamente afectados por la especie de hospedero. En promedio, pedicelos cupulares más largos y frutos más grandes se encontraron en plantas que crecen en Acacia pennatula, Quercus germana, Ostrya virginiana y Liquidambar styraciflua, mientras que los más pequeños se encontraron generalmente en plantas sobre árboles hospederos cultivados.  Conclusiones:  Los resultados nos brindan información valiosa para futuras comparaciones entre especies en relación con los efectos de la especie de hospedero en la variación del tamaño de los frutos. Aunque los efectos de la especie de hospedero en la variación del tamaño de los frutos pueden variar en el espacio, las diferencias en el tamaño de los frutos pueden ser el resultado de diferencias en el recurso del hospedero. Se necesitan más estudios sobre la selección y el manejo de los frutos por parte de los dispersores de semillas, para discutir si la variación observada en el tamaño de los frutos se correlaciona con la selección y el manejo de los frutos por parte de los principales consumidores, y con la unión y el establecimiento exitosos en la rama del hospedero después del paso por el tracto intestinal.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[birds]]></kwd>
<kwd lng="en"><![CDATA[host species]]></kwd>
<kwd lng="en"><![CDATA[parasitic plant]]></kwd>
<kwd lng="en"><![CDATA[reproductive responses]]></kwd>
<kwd lng="en"><![CDATA[seed dispersal]]></kwd>
<kwd lng="es"><![CDATA[aves]]></kwd>
<kwd lng="es"><![CDATA[dispersión de semillas]]></kwd>
<kwd lng="es"><![CDATA[especies de hospedero]]></kwd>
<kwd lng="es"><![CDATA[planta parásita]]></kwd>
<kwd lng="es"><![CDATA[respuestas reproductivas]]></kwd>
</kwd-group>
</article-meta>
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