<?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>S2007-42982016000100051</article-id>
<article-id pub-id-type="doi">10.17129/botsci.218</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Growth of hartweg&#8217;s pine (Pinus hartwegii) parasitized by two dwarf mistletoe species (Arceuthobium spp.)]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Queijeiro-Bolaños]]></surname>
<given-names><![CDATA[Mónica E.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cano-Santana]]></surname>
<given-names><![CDATA[Zenón]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Ciencias Departamento de Ecología y Recursos Naturales]]></institution>
<addr-line><![CDATA[D.F. México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2016</year>
</pub-date>
<volume>94</volume>
<numero>1</numero>
<fpage>51</fpage>
<lpage>62</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S2007-42982016000100051&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S2007-42982016000100051&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S2007-42982016000100051&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: Coniferous forests occupy a large extent (17 %) of the Mexican territory. Within these forests, pines are a common and sometimes dominant component; however, several abiotic and biotic factors affect pines growth. Among the main biotic factors is the parasitic effect of dwarf mistletoes. In Zoquiapan (Iztaccíhuatl Popocatépetl National Park, Central Mexico) two dwarf mistletoe species coexist parasitizing Pinus hartwegii. The aim of this study was to know the effect of Arceuthobium globosum and A. vaginatum, either individually or as a pair, on P. hartwegii growth, allometric relations, and size susceptibility. We recorded diameter at breast height (dbh) and crown spread of P. hartwegii for 3 years on individuals infested by either one of the species, both, or none, as well as the infection severity. The relative growth rate (RGR) in diameter was strongly influenced by the pines initial dbh; whereas the infecting species or severity did not show a differential effect. The allometric relation of dbh and height was affected by parasitism, where the trees infected by both species were shorter than the uninfected and infected by A. vaginatum at the same dbh. The parasitic effect does not differ among these mistletoe species.,However, the host-size structure affects the presence and severity of infection; maintaining even-age stands provides a better scenario for a milder effect of parasitism, which should be considered for managing plans.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Los bosques de coníferas ocupan una gran extensión en el territorio mexicano (17 %). Dentro de estos bosques, los pinos son componente comunes, y en ocasiones dominantes; sin embargo, diversos factores abióticos y bióticos afectan su crecimiento. Entre los principales factores bióticos se encuentra el efecto parasítico del muérdago enano. En Zoquiapan (Parque Nacional Iztaccíhuatl Popocatépetl, Centro de México) dos especies de muérdago enano coexisten y parasitan a Pinus hartwegii. El objetivo de este estudio es el de conocer el efecto de Arceuthobium globosum y A. vaginatum, solos o en conjunto, en el crecimiento de P. hartwegii, las relaciones alométricas y la susceptibilidad por tamaños. Registramos el diámetro a la altura del pecho (dap) y la dispersión de la copa de P. hartwegii por tres años en individuos infestados por alguna de las dos especies, ambas o ninguna, así como la severidad de la infestación. La tasa relativa de crecimiento (TRC) en diámetro estuvo fuertemente influida por el dap inicial de los pinos, mientras que la especie que infecta y la severidad no mostraron un efecto diferencial. La relación alométrica del dap y la altura fue afectada por el parasitismo, ya que, dentro de una misma categoría de dap, los árboles infectados por las dos especies fueron más bajos que los no infectados y los infectados por A. vaginatum. El efecto del parásito no difirió entre especies. Sin embargo, la estructura de tamaños del hospedero afecta la presencia y severidad de la infección, por ello, el mantenimiento de bosques de no coetáneos provee un mejor escenario para atenuar el efecto del parasitismo, observación que debe ser considerada en los planes de manejo.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[allometry]]></kwd>
<kwd lng="en"><![CDATA[Arceuthobium globosum]]></kwd>
<kwd lng="en"><![CDATA[Arceuthobium vaginatum]]></kwd>
<kwd lng="en"><![CDATA[parasitic plants]]></kwd>
<kwd lng="en"><![CDATA[pines]]></kwd>
<kwd lng="en"><![CDATA[relative growth rate]]></kwd>
<kwd lng="es"><![CDATA[alometría]]></kwd>
<kwd lng="es"><![CDATA[Arceuthobium globosum]]></kwd>
<kwd lng="es"><![CDATA[Arceuthobium vaginatum]]></kwd>
<kwd lng="es"><![CDATA[plantas parásitas]]></kwd>
<kwd lng="es"><![CDATA[pinos]]></kwd>
<kwd lng="es"><![CDATA[tasa relativa de crecimiento]]></kwd>
</kwd-group>
</article-meta>
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