<?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>0187-7380</journal-id>
<journal-title><![CDATA[Revista fitotecnia mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. fitotec. mex]]></abbrev-journal-title>
<issn>0187-7380</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Fitogenética A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-73802021000200183</article-id>
<article-id pub-id-type="doi">10.35196/rfm.2021.2.183</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Indicadores reproductivos en dos poblaciones naturales de Pinus hartwegii Lindl]]></article-title>
<article-title xml:lang="en"><![CDATA[Reproductive indicators in two natural populations of Pinus hartwegii Lindl]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Andrade-Gómez]]></surname>
<given-names><![CDATA[Karem A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-Herrera]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[López-Upton]]></surname>
<given-names><![CDATA[Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jiménez-Casas]]></surname>
<given-names><![CDATA[Marcos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lobato-Ortiz]]></surname>
<given-names><![CDATA[Ricardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2021</year>
</pub-date>
<volume>44</volume>
<numero>2</numero>
<fpage>183</fpage>
<lpage>190</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-73802021000200183&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-73802021000200183&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-73802021000200183&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Pinus hartwegii Lindl. crece entre 2500 y 4300 msnm en las montañas de México y América Central. Información sobre indicadores reproductivos en una población es útil para describir el estado reproductivo de una especie y éstos pueden estar influenciados por variables ambientales. El objetivo del presente estudio fue evaluar la variación de indicadores reproductivos entre altitudes en poblaciones de Pinus hartwegii. Los conos se recolectaron entre 3600 y 4100 msnm en el Monte Tláloc (MT) y el Nevado de Toluca (NT) en México. En cada cono se determinó el número de semillas potenciales (NSP), óvulos abortados en el año 1 (NOAA1), óvulos abortados en el año 2 (NOAA2), semillas vanas (NSV), semillas llenas (NSLL), peso promedio de una semilla (PPS), eficiencia reproductiva (ER), eficiencia en la producción de semillas (EPS) e índice de depresión endogámica (IDE). Las variables ambientales se obtuvieron con el programa Spline. Los coeficientes de correlación (r) se calcularon entre indicadores reproductivos y variables ambientales. Se encontraron diferencias significativas entre poblaciones y entre altitudes en NSP, NOAA2, NSV, NSLL, PPS y ER, mientras que no hubo diferencias significativas entre poblaciones para EPS e IDE, aunque sí entre altitudes; tampoco se encontraron diferencias significativas entre poblaciones ni entre altitudes para NOAA1. El coeficiente de correlación fue alto (r = 0.929) entre NOAA2 y precipitación en septiembre y octubre; también éste fue alto (r = -0.829) entre ER y heladas tardías en primavera. Algunos valores de r fueron moderados entre indicadores reproductivos y variables ambientales; por ejemplo, el coeficiente de correlación fue 0.786 entre NSV y temperatura media anual, de 0.714 entre el NSLL y temperatura máxima media del mes más caliente y r = -0.642 entre NSP y temperatura media mínima del mes más frio. Los valores de los indicadores reproductivos mostraron variación entre las poblaciones y entre altitudes dentro de poblaciones de Pinus hartwegii.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[SUMMARY Pinus hartwegii Lindl. grows between 2500 and 4300 masl in the mountains of Mexico and Central America. Information on reproductive indicators in a population is useful to describe the reproductive status of a species, and may be influenced by environmental variables. The objective of this study was to evaluate the variation of reproductive indicators between altitudes in Pinus hartwegii populations. Cones were collected between 3600 and 4100 masl at Monte Tlaloc (MT) and Nevado de Toluca (NT) in Mexico. The number of potential seeds (NPS), aborted ovules in year 1 (AOY1), aborted ovules in year 2 (AOY2), empty seeds (ES), full seeds (FS), mean weight of a seed (MWS), reproductive efficiency (RE), efficiency in seed production (ESP) and endogamy depression index (EDI) were determined in each cone. The environmental variables were obtained with the Spline program. Correlation coefficients (r) were estimated between reproductive indicators and environmental variables. Significant differences were found between populations and between altitudes within populations for NPS, AOY2, ES, FS, MWS and RE, while there were no significant differences between populations for ESP and EDI, they were present between altitudes; neither were significant differences between populations and altitudes for AOY1. The correlation coefficient was high (r = 0.929) between AOY2 and precipitation in September and October; it was also high (r = -0.829) between RE and late frosts in Spring. Some r values between reproductive indicators and environmental variables were moderate; for example, the correlation coefficient was 0.786 between NSV and mean annual temperature, it was 0.714 between NSLL and mean maximum temperature of the warmest month, while it was -0.642 between NPS and mean minimum temperature in the coldest month. The values of reproductive indicators showed variation between populations and between altitudes within Pinus hartwegii populations.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Pinus hartwegii]]></kwd>
<kwd lng="es"><![CDATA[depresión endogámica]]></kwd>
<kwd lng="es"><![CDATA[eficiencia reproductiva]]></kwd>
<kwd lng="es"><![CDATA[semillas potenciales]]></kwd>
<kwd lng="en"><![CDATA[Pinus hartwegii]]></kwd>
<kwd lng="en"><![CDATA[inbreeding depression]]></kwd>
<kwd lng="en"><![CDATA[potential seeds]]></kwd>
<kwd lng="en"><![CDATA[reproductive efficiency]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Alba]]></surname>
<given-names><![CDATA[L. J.]]></given-names>
</name>
<name>
<surname><![CDATA[Aparicio R.]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Márquez R.]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Potencial y eficiencia de producción de semillas de Pinus hartwegii Lindl. de dos poblaciones de México]]></article-title>
<source><![CDATA[Foresta Veracruzana]]></source>
<year>2003</year>
<volume>5</volume>
<page-range>23-6</page-range></nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Astudillo-Sánchez]]></surname>
<given-names><![CDATA[C. C.]]></given-names>
</name>
<name>
<surname><![CDATA[Villanueva-Díaz]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Endara-Agramont]]></surname>
<given-names><![CDATA[A. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Nava-Bernal1]]></surname>
<given-names><![CDATA[G. E.]]></given-names>
</name>
<name>
<surname><![CDATA[Gómez-Albores]]></surname>
<given-names><![CDATA[M. Á.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Influencia climática en el reclutamiento de Pinus hartwegii Lindl. del ecotono bosque-pastizal alpino en Monte Tláloc, México]]></article-title>
<source><![CDATA[Agrociencia]]></source>
<year>2017</year>
<volume>51</volume>
<page-range>105-18</page-range></nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bramlett]]></surname>
<given-names><![CDATA[D. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Belcher]]></surname>
<given-names><![CDATA[E. W.]]></given-names>
</name>
<name>
<surname><![CDATA[De Barr]]></surname>
<given-names><![CDATA[G. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Hertel]]></surname>
<given-names><![CDATA[G. D.]]></given-names>
</name>
<name>
<surname><![CDATA[Karrfalt]]></surname>
<given-names><![CDATA[R. P.]]></given-names>
</name>
<name>
<surname><![CDATA[Lantz]]></surname>
<given-names><![CDATA[C. W.]]></given-names>
</name>
<name>
<surname><![CDATA[Yates]]></surname>
<given-names><![CDATA[H. O.]]></given-names>
</name>
</person-group>
<source><![CDATA[Cone Analysis of Southern Pines - A Guidebook. General Technical Report SE-13]]></source>
<year>1977</year>
<publisher-loc><![CDATA[Asheville, North Carolina, USA ]]></publisher-loc>
<publisher-name><![CDATA[Southeastern Forest Experiment Station, Forest Service, U.S. Department of Agriculture]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Burczyka]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Lewandowskib]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Chalupka]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Local pollen dispersal and distant gene flow in Norway spruce (Picea abies [L.] Karst.)]]></article-title>
<source><![CDATA[Forest Ecolgy and Management]]></source>
<year>2004</year>
<volume>197</volume>
<page-range>39-48</page-range></nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bustamante-García]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<name>
<surname><![CDATA[Prieto-Ruíz]]></surname>
<given-names><![CDATA[J. Á.]]></given-names>
</name>
<name>
<surname><![CDATA[Carrillo-Parra]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Álvarez-Zagoya]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[González-Rodríguez]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Corral-Rivas]]></surname>
<given-names><![CDATA[J. J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Seed production and quality of Pinus durangensis Mart., from seed areas and seed stands in Durango, Mexico]]></article-title>
<source><![CDATA[Pakistan Journal of Botany]]></source>
<year>2014</year>
<volume>46</volume>
<page-range>1197-202</page-range></nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bustamante-García]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<name>
<surname><![CDATA[Prieto-Ruíz]]></surname>
<given-names><![CDATA[J. Á.]]></given-names>
</name>
<name>
<surname><![CDATA[Merlín-Bermudes]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Álvarez-Zagoya]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Carrillo-Parra]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Hernández-Díaz]]></surname>
<given-names><![CDATA[J. C.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Potencial y eficiencia de producción de semilla de Pinus engelmannii Carr., en tres rodales semilleros del estado de Durango, México]]></article-title>
<source><![CDATA[Madera y Bosques]]></source>
<year>2012</year>
<volume>18</volume>
<page-range>7-21</page-range></nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Castilleja]]></surname>
<given-names><![CDATA[S. P.]]></given-names>
</name>
<name>
<surname><![CDATA[Delgado V.]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Sáenz-Romero]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Herrerías D.]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Reproductive success and inbreeding differ in fragmented populations of Pinus rzedowskii and Pinus ayacahuite var. veitchii, two endemic Mexican pines under threat]]></article-title>
<source><![CDATA[Forests]]></source>
<year>2016</year>
<volume>7</volume>
</nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Crnokrak]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Barrett]]></surname>
<given-names><![CDATA[S. C. H.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Perspective: purging the genetic load: a review of the experimental evidence]]></article-title>
<source><![CDATA[Evolution]]></source>
<year>2002</year>
<volume>56</volume>
<page-range>2347-58</page-range></nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Davidson]]></surname>
<given-names><![CDATA[R. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Edwards]]></surname>
<given-names><![CDATA[D. G. W.]]></given-names>
</name>
<name>
<surname><![CDATA[Sziklai]]></surname>
<given-names><![CDATA[O.]]></given-names>
</name>
<name>
<surname><![CDATA[El-Kassaby]]></surname>
<given-names><![CDATA[Y. A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Genetic variation in germination parameters among populations of pacific silver fir populations]]></article-title>
<source><![CDATA[Silvae Genetica]]></source>
<year>1996</year>
<volume>45</volume>
<page-range>165-71</page-range></nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Endara-Agramont]]></surname>
<given-names><![CDATA[A. R.]]></given-names>
</name>
<name>
<surname><![CDATA[Calderón-Contreras]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Nava-Bernal]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Franco-Maass]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Analysis of fragmentation processes in high-mountain forests of the centre of Mexico]]></article-title>
<source><![CDATA[American Journal of Plant Sciences]]></source>
<year>2013</year>
<volume>4</volume>
<page-range>697-704</page-range></nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gómez]]></surname>
<given-names><![CDATA[J. D. M.]]></given-names>
</name>
<name>
<surname><![CDATA[Ramírez H.]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Jasso M.]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[López U.]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Variación en características reproductivas y germinación de semillas de Pinus leiophylla Schiede ex Schltdl. &amp; Cham]]></article-title>
<source><![CDATA[Revista Fitotecnia Mexicana]]></source>
<year>2010</year>
<volume>33</volume>
<page-range>297-304</page-range></nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hartl]]></surname>
<given-names><![CDATA[D. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Clark]]></surname>
<given-names><![CDATA[A. G.]]></given-names>
</name>
</person-group>
<source><![CDATA[Principles of Population Genetics]]></source>
<year>2007</year>
<edition>4</edition>
<publisher-loc><![CDATA[Sunderland, Massachusetts, USA ]]></publisher-loc>
<publisher-name><![CDATA[Sinauer Associates]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Iglesias]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Mora]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Casas]]></surname>
<given-names><![CDATA[J. L.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Morfometría, viabilidad y variabilidad de las semillas de la población de Pinus hartwegii del Cofre de Perote, Veracruz, México]]></article-title>
<source><![CDATA[Cuadernos de Biodiversidad]]></source>
<year>2006</year>
<volume>19</volume>
<page-range>14-8</page-range></nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Iglesias]]></surname>
<given-names><![CDATA[L.G.]]></given-names>
</name>
<name>
<surname><![CDATA[Solís-Ramos]]></surname>
<given-names><![CDATA[L. Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Viveros-Viveros]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Variación morfométrica en dos poblaciones naturales de Pinus hartwegii Lindl. del estado de Veracruz]]></article-title>
<source><![CDATA[Phyton]]></source>
<year>2012</year>
<volume>81</volume>
<page-range>239-46</page-range></nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Mendoza-Hernández]]></surname>
<given-names><![CDATA[N. B]]></given-names>
</name>
<name>
<surname><![CDATA[Ramírez-Herrera]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[López-Upton]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Reyes-Hernández]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
<name>
<surname><![CDATA[López]]></surname>
<given-names><![CDATA[P. A.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Variación de características reproductivas de árboles de Pinus patula en un huerto semillero sexual]]></article-title>
<source><![CDATA[Agrociencia]]></source>
<year>2018</year>
<volume>52</volume>
<page-range>279-91</page-range></nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Mosseler]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Major]]></surname>
<given-names><![CDATA[J. E.]]></given-names>
</name>
<name>
<surname><![CDATA[Simpson]]></surname>
<given-names><![CDATA[J. D.]]></given-names>
</name>
<name>
<surname><![CDATA[Daigle]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Lange]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Park]]></surname>
<given-names><![CDATA[Y. S.]]></given-names>
</name>
<name>
<surname><![CDATA[Rajora]]></surname>
<given-names><![CDATA[O. P.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Indicators of population viability in red spruce, Picea rubens. I. Reproductive traits and fecundity]]></article-title>
<source><![CDATA[Canadian Journal of Botany]]></source>
<year>2000</year>
<volume>78</volume>
<page-range>928-40</page-range></nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Owens]]></surname>
<given-names><![CDATA[J. N.]]></given-names>
</name>
<name>
<surname><![CDATA[Bennett]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[L&#8217;Hirondelle]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Pollination and cone morphology affect cone and seed production in lodgepole pine seed orchards]]></article-title>
<source><![CDATA[Canadian Journal of Forest Research]]></source>
<year>2005</year>
<volume>35</volume>
<page-range>383-400</page-range></nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Owens]]></surname>
<given-names><![CDATA[J. N.]]></given-names>
</name>
<name>
<surname><![CDATA[Fernando]]></surname>
<given-names><![CDATA[D. D.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Pollination and seed production in western white pine]]></article-title>
<source><![CDATA[Canadian Journal of Forest Research]]></source>
<year>2007</year>
<volume>37</volume>
<page-range>260-75</page-range></nlm-citation>
</ref>
<ref id="B19">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Perry]]></surname>
<given-names><![CDATA[J. P.]]></given-names>
</name>
</person-group>
<source><![CDATA[The Pines of Mexico and Central America]]></source>
<year>1991</year>
<publisher-loc><![CDATA[Portland, Oregon, USA ]]></publisher-loc>
<publisher-name><![CDATA[Timber Press]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B20">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rajora]]></surname>
<given-names><![CDATA[O. P.]]></given-names>
</name>
<name>
<surname><![CDATA[Rahman]]></surname>
<given-names><![CDATA[M. H.]]></given-names>
</name>
<name>
<surname><![CDATA[Buchert]]></surname>
<given-names><![CDATA[G. P.]]></given-names>
</name>
<name>
<surname><![CDATA[Dancik]]></surname>
<given-names><![CDATA[B. P.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Microsatellite DNA analysis of genetic effects of harvesting in old-growth eastern white pine (Pinus strobus) in Ontario, Canada]]></article-title>
<source><![CDATA[Molecular Ecology]]></source>
<year>2000</year>
<volume>9</volume>
<page-range>339-48</page-range></nlm-citation>
</ref>
<ref id="B21">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rehfeldt]]></surname>
<given-names><![CDATA[G. E.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[A spline model of climate for the Western United States]]></article-title>
<source><![CDATA[General Technical Report RMRS-GTR-165]]></source>
<year>2006</year>
<publisher-loc><![CDATA[Colorado, USA ]]></publisher-loc>
<publisher-name><![CDATA[Rocky Mountain Research Station, USDA Forest Service, Fort Collins]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B22">
<nlm-citation citation-type="book">
<collab>SAS Institute</collab>
<source><![CDATA[Guide for SAS® 9.4 Foundation for Microsoft Windows for x64]]></source>
<year>2012</year>
<publisher-loc><![CDATA[North Carolina, USA ]]></publisher-loc>
<publisher-name><![CDATA[SAS Institute Inc. Cary]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B23">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Villers-Ruiz]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Trejo-Vázquez]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Evaluación de la vulnerabilidad en los ecosistemas forestales]]></article-title>
<person-group person-group-type="editor">
<name>
<surname><![CDATA[Martínez]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Fernández-Bremauntz]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Cambio Climático: Una Visión desde México]]></source>
<year>2004</year>
<page-range>239-54</page-range><publisher-loc><![CDATA[México D.F. ]]></publisher-loc>
<publisher-name><![CDATA[Secretaría de Medio Ambiente y Recursos Naturales-Instituto Nacional de Ecología]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B24">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[White]]></surname>
<given-names><![CDATA[T. L.]]></given-names>
</name>
<name>
<surname><![CDATA[Adams]]></surname>
<given-names><![CDATA[W. T.]]></given-names>
</name>
<name>
<surname><![CDATA[Neale]]></surname>
<given-names><![CDATA[D. B.]]></given-names>
</name>
</person-group>
<source><![CDATA[Forest Genetics]]></source>
<year>2007</year>
<publisher-loc><![CDATA[London, UK. ]]></publisher-loc>
<publisher-name><![CDATA[CAB International]]></publisher-name>
</nlm-citation>
</ref>
</ref-list>
</back>
</article>
