<?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>1405-2768</journal-id>
<journal-title><![CDATA[Polibotánica]]></journal-title>
<abbrev-journal-title><![CDATA[Polibotánica]]></abbrev-journal-title>
<issn>1405-2768</issn>
<publisher>
<publisher-name><![CDATA[Instituto Politécnico Nacional, Escuela Nacional de Ciencias Biológicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-27682007000100001</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[AGENTES ASOCIADOS Y SU PAPEL EN LA DECLINACIÓN Y MUERTE DE ENCINOS (QUERCUS, FAGACEAE) EN EL CENTRO-OESTE DE MÉXICO]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alvarado-Rosales]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Saavedra-Romero]]></surname>
<given-names><![CDATA[L. de L.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Almaraz-Sánchez]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tlapal-Bolaños]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Trejo-Ramírez]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Davidson]]></surname>
<given-names><![CDATA[J. M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Kliejunas]]></surname>
<given-names><![CDATA[J. T.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Oak]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[O&#8217;Brien]]></surname>
<given-names><![CDATA[J.G.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Orozco-Torres]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quiroz-Reygadas]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Posgraduados  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma Chapingo  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Secretaría del Medio Ambiente Recursos Naturales y Pesca  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,USDA Forest Service  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af5">
<institution><![CDATA[,SEMARNAT  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<aff id="Af6">
<institution><![CDATA[,SEMARNAT  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2007</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2007</year>
</pub-date>
<numero>23</numero>
<fpage>1</fpage>
<lpage>21</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-27682007000100001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-27682007000100001&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-27682007000100001&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Este estudio tuvo como objetivo identificar y determinar el papel tanto de los factores bióticos como de los abióticos asociados a la declinación y muerte del encino en cinco estados de la República mexicana: Aguascalientes, Colima, Guanajuato, Jalisco y Nayarit. Para esto, se establecieron dos sitios permanentes de 0.1 ha en cada una de las áreas más representativas (con arbolado muerto, con muerte regresiva y cancros con exudado) de los estados mencionados (10 sitios en total), los cuales fueron muestreados durante 2003, 2004 y 2005. Se hicieron observaciones y colectas en campo de follaje, ramas, tronco y suelo, para identificar a los diferentes agentes de daño en cada sitio. Se realizaron aislamientos in situ de cancros con exudado en medios específicos. Los agentes bióticos más comunes fueron: Phytophthora cinnamomi, Pythium sp., Hypoxylon antropunctatum, Ganoderma sp., Armillaria sp., Apiognomonia quercina, el muérdago enano (Phoradendron villosum), barrenadores, defoliadores y sobrepastoreo. Entre los abióticos causantes de estrés y muerte, destacaron los daños ocasionados por las bajas temperaturas-falta de agua y fuego. Con base en su incidencia, P. cinnamomi, H. antropunctatum y las bajas temperaturas-falta de agua son considerados los factores de mayor importancia en la declinación y muerte del encino. P. cinnamomi fue identificado en cuatro de los diez sitios, particularmente de Colima y Jalisco; H. antropunctatum fué detectado en seis de diez, principalmente en los rodales de Nayarit y Aguascalientes. Los cancros de troncos (rajaduras), debido a las bajas temperaturas-falta de agua, se observaron en cuatro sitios, afectando al 52% de los árboles en Aguascalientes y 24% en Guanajuato. Se concluye que P. cinnamomi está ocasionando la muerte de algunas especies de encino, H. antropunctatum está coloni-zando árboles debilitados y las bajas temperaturas-falta de agua están participando como agentes causantes de estrés y muerte en algunos casos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT This study was carried out to identify biotic and abiotic agents and to determine their role in oak decline and death in five states of the Mexican Republic: Aguascalientes, Colima, Guanajuato, Jalisco and Nayarit. Two 0.1-ha permanent plots were established at the most representative forested areas with tree death, dieback and bleeding cankers in these states and sampled during 2003, 2004 and 2005 (10 plots in total). Field observations were made, and foliage, branch, trunk and soil samples were collected to identify the associated agents in each plot. Isolates from bleeding cankers were made in situ. The most commonly found biotic agents were: Phytophthora cinnamomi, Pythium sp., Hypoxylon antropunctatum, Ganoderma spp., Armillaria sp., Apiognomonia quercina, the dwarf mistletoe (Phoradendron villosum), bark borers, insect defoliators and livestock overgrazing. Among the abiotic stress factors commonly found were the effects due to low temperature-lack of water and fire. Based on their incidence, P. cinnamomi, H. antropunctatum and low temperature-lack of water were considered the most important contributors to the decline and death of the oaks. P. cinnamomi was identified in four of the 10 plots, mainly in Colima and Jalisco; H. antropunctatum was detected in six plots, particularly in Nayarit and Aguascalientes. Stem cankers (cracks) due to low temperature-lack of water were observed in four plots, damaging 52% of the trees in Aguascalientes and 24% in Guanajuato. It was concluded that P. cinnamomi is killing some oak species, H. antropunctatum is colonizing weakened trees, and low temperature-lack of water is causing stress and in some cases death in oaks.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Quercus spp.]]></kwd>
<kwd lng="es"><![CDATA[encino]]></kwd>
<kwd lng="es"><![CDATA[declinación]]></kwd>
<kwd lng="es"><![CDATA[P. cinnamomi]]></kwd>
<kwd lng="es"><![CDATA[H. antropunctatum]]></kwd>
<kwd lng="es"><![CDATA[bajas temperaturas-falta de agua]]></kwd>
<kwd lng="en"><![CDATA[Quercus spp.]]></kwd>
<kwd lng="en"><![CDATA[oak]]></kwd>
<kwd lng="en"><![CDATA[decline]]></kwd>
<kwd lng="en"><![CDATA[P. cinnamomi]]></kwd>
<kwd lng="en"><![CDATA[H. antropunctatum]]></kwd>
<kwd lng="en"><![CDATA[low temperature-lack of water]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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