<?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>2007-4298</journal-id>
<journal-title><![CDATA[Botanical Sciences]]></journal-title>
<abbrev-journal-title><![CDATA[Bot. sci]]></abbrev-journal-title>
<issn>2007-4298</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Botánica de México A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2007-42982017000200189</article-id>
<article-id pub-id-type="doi">10.17129/botsci.812</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[The role of leaf traits and bird-mediated insect predation on patterns of herbivory in a semiarid environment in central Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[El papel de las características foliares y la depredación por aves en los patrones de herbivoría en un ambiente semiárido del centro de México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruiz-Guerra]]></surname>
<given-names><![CDATA[Betsabé]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Nieves-Silva]]></surname>
<given-names><![CDATA[Erika]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Guevara]]></surname>
<given-names><![CDATA[Roger]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto de Ecología  ]]></institution>
<addr-line><![CDATA[Xalapa ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Benemérita Universidad Autónoma de Puebla  ]]></institution>
<addr-line><![CDATA[Puebla ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2017</year>
</pub-date>
<volume>95</volume>
<numero>2</numero>
<fpage>189</fpage>
<lpage>201</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-42982017000200189&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-42982017000200189&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-42982017000200189&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Background:  In arid environments plants face aridity and herbivory, therefore it has been proposed that both are convergent selective forces. However the drivers of insect herbivory in these ecosystems remain poorly understood.  Question:  Does insect herbivory vary in two plant associations subject to different levels of aridity? To what extent differences in herbivory are determined either by foliar traits, or predation by birds?  Study species: Citharexylum tetramerum, Viguiera pinnatilobata, and Solanum tridynamum.  Study site:  We compared two-plant associations: the mezquital with a closed canopy and wettest conditions and the tetechera a dry place with an open canopy at the Zapotitlán Valley, México.  Methods:  We evaluated leaf traits (N, C, water content, leaf strength and trichomes), herbivore insects abundance and the effects on herbivory when some predators are excluded.  Results:  Herbivory was higher in the drier site (tetechera) than in the more humid one (mezquital) in one year but not in the second one. In both plant associations herbivory increased when predators of herbivores were excluded. Plants in mezquital had more water and nitrogen content than plants in tetechera. The later had higher carbon concentration and carbon:nitrogen ratio, leaf strength and density of trichomes. Abundance of herbivore insects and insect predation were higher in the most arid site.  Conclusions:  Our results show that insect herbivory increases in the most arid site and that predation by birds plays a role as a driver of herbivory, while resistance to aridity seems to be the main driver of leaf structural characteristics.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Antecedentes:  En ecosistemas áridos las plantas se enfrentan a la sequía y a la herbivoría, por lo cual se ha postulado que éstas pueden actuar como presiones de selección convergentes sobre los atributos foliares. Sin embargo, los determinantes de la herbivoría han sido poco explorados.  Pregunta: ¿Los niveles de herbivoría varían en sitios con condiciones de humedad contrastantes? ¿La herbivoría está determinada por las características nutritivas/defensivas de las plantas o por la depredación por aves?  Especies de estudio: Citharexylum tetramerum, Viguiera pinnatilobata, and Solanum tridynamum.  Sitio de estudio:  Comparamos dos asociaciones vegetales: el mezquital con un dosel cerrado y húmedo y la tetechera un sitio seco con un dosel muy abierto, en el Valle de Zapotitlán, México.  Métodos:  Evaluamos características foliares (N, C, contenido de agua, dureza y tricomas), la abundancia de insectos herbívoros y las consecuencias de la exclusión de algunos depredadores sobre los niveles de herbivoría.  Resultados:  Los niveles de herbivoría fueron mayores en el sitio más árido (tetechera) comparado con el mezquital pero solo en un año. La herbivoría aumentó cuando los depredadores de los herbívoros fueron excluidos en las dos asociaciones vegetales. Las plantas del mezquital tuvieron un mayor contenido de agua y nitrógeno que las plantas de la tetechera. Éstas últimas, tuvieron una mayor concentración de carbono:nitrogeno, dureza y densidad de tricomas. La abundancia de insectos herbívoros y las tasas de depredación fueron mayores en la tetechera.  Conclusiones:  La herbivoría aumenta en la asociación vegetal más árida. La depredación por aves influye en los niveles de herbivoría, mientras que la resistencia a la sequía parece ser el determinante de las características estructurales de las hojas.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[herbivory]]></kwd>
<kwd lng="en"><![CDATA[leaf traits]]></kwd>
<kwd lng="en"><![CDATA[bird predation]]></kwd>
<kwd lng="en"><![CDATA[Tehuacán-Cuicatlán]]></kwd>
<kwd lng="en"><![CDATA[plant defence]]></kwd>
<kwd lng="es"><![CDATA[herbivoría]]></kwd>
<kwd lng="es"><![CDATA[características foliares]]></kwd>
<kwd lng="es"><![CDATA[depredación por aves]]></kwd>
<kwd lng="es"><![CDATA[Tehuacán-Cuicatlán]]></kwd>
<kwd lng="es"><![CDATA[defensa en plantas]]></kwd>
</kwd-group>
</article-meta>
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