<?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>1405-888X</journal-id>
<journal-title><![CDATA[TIP. Revista especializada en ciencias químico-biológicas]]></journal-title>
<abbrev-journal-title><![CDATA[TIP]]></abbrev-journal-title>
<issn>1405-888X</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Facultad de Estudios Superiores Zaragoza]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-888X2005000200061</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Micrositios del pasto Navajita (Bouteloua gracilis) en comunidades de pastizal y de matorral del Altiplano Mexicano]]></article-title>
<article-title xml:lang="en"><![CDATA[Blue grama (Bouteloua gracilis) microsites in grassland and brushwood communities in the Mexican Plateau]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[García-Sánchez]]></surname>
<given-names><![CDATA[Rosalva]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Monroy-Ata]]></surname>
<given-names><![CDATA[Arcadio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,UNAM FES Zaragoza Unidad de Investigación en Ecología Vegetal]]></institution>
<addr-line><![CDATA[México, D.F. ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,UNAM FES Zaragoza Unidad de Investigación en Ecología Vegetal]]></institution>
<addr-line><![CDATA[México, D.F. ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2005</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2005</year>
</pub-date>
<volume>8</volume>
<numero>2</numero>
<fpage>61</fpage>
<lpage>70</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-888X2005000200061&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-888X2005000200061&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-888X2005000200061&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El objetivo de este trabajo fue determinar si hay un tipo de micrositio específico para el establecimiento de Bouteloua gracilis, con patrones recurrentes, en dos diferentes tipos de comunidades vegetales. El pasto navajita azul es una especie perenne de alto valor forrajero y resistente a la sequía. Para ello se realizó un recorrido por tres matorrales y tres pastizales del Altiplano Mexicano; los sitios estudiados fueron elegidos con base en los reportes de ejemplares colectados y herborizados. Los resultados muestran, por un lado, que en los pastizales se presentan micrositios más de tipo funcional que físico, que determinan el establecimiento de B. gracilis, debidoprincipalmentea los altos requerimientos de humedad edáfica de las semillas para germinar y desarrollarse. El micrositio más frecuente que determina el reclutamiento de los individuos provenientes de semilla es el suelo cercano a individuos adultos de su propia especie. Por otro lado, en los matorrales se detectaron, de manera recurrente, varias condiciones de micrositio para la especie y se observó que el tipo de micrositio es determinante, tanto para el establecimiento como para el crecimiento de este y otros pastos; también, el estudio mostró que en comunidades de matorral existe una mayor diversidad de micrositios que en los pastizales, por lo que se concluye que los individuos de B. gracilis, en los matorrales, crecen asociados a micrositios específicos que le brindan protección contra la desecación.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract This paper was aimed to determine if there is a specific kind of microsite for the establishment of Bouteloua gracilis and if there is a recurrent pattern in two different plant community types. The blue grama perennial grass has a great utilization as forage and it is drought resistant. in order to get this objective, a study on three areas of brushwood and three grasslands in the Mexican Plateau was conducted. The selection of the locations for the study was based on reports of the existence of collected and herborized specimens in the area. On one hand, the results show that there are more functional than physical microsites for the establishment of B. gracilis in grasslands. Probably this is due to the fact that the high soil humidity requirements for the seeds to germinate and to develop are found in these locations. The most frequent microsite for the recruitment of new individuals from seeds is in the neighborhood of adults of the same species. On the other hand, several microsite conditions were recurrently detected in brushwood. it was observed that the type of microsite is determinant for both the establishment and the development of B. gracilis and other grasses. Furthermore, the results of the study also show that there is a greater microsite diversity in brushwood than in grasslands. it was concluded that the development of B. gracilis individuals in brushwood is related to microsites which protect them from dehydration.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Bouteloua gracilis]]></kwd>
<kwd lng="es"><![CDATA[comunidad vegetal]]></kwd>
<kwd lng="es"><![CDATA[establecimiento]]></kwd>
<kwd lng="es"><![CDATA[matorral]]></kwd>
<kwd lng="es"><![CDATA[micrositio]]></kwd>
<kwd lng="en"><![CDATA[Bouteloua gracilis]]></kwd>
<kwd lng="en"><![CDATA[plant community]]></kwd>
<kwd lng="en"><![CDATA[establishment]]></kwd>
<kwd lng="en"><![CDATA[brushwood]]></kwd>
<kwd lng="en"><![CDATA[microsite]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<label>1</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Grime]]></surname>
<given-names><![CDATA[J.P]]></given-names>
</name>
</person-group>
<source><![CDATA[Estrategias de adaptación de las plantas y procesos que controlan la vegetación]]></source>
<year>1982</year>
<publisher-loc><![CDATA[México ]]></publisher-loc>
<publisher-name><![CDATA[Limusa]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B2">
<label>2</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Monroy]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
</person-group>
<source><![CDATA[A. Installation de plantes pérennes de la zone aride soumises à des contraintes hydriques controlées. Diplome d'etudes approfondies d'ecologie appliquée]]></source>
<year>1985</year>
<publisher-loc><![CDATA[Montpellier, Francia ]]></publisher-loc>
<publisher-name><![CDATA[Université des Sciences et Techniques du Languedoc]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B3">
<label>3</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rzedowski]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Las principales zonas áridas de México]]></article-title>
<source><![CDATA[Bios]]></source>
<year>1968</year>
<volume>1</volume>
<page-range>4-24</page-range></nlm-citation>
</ref>
<ref id="B4">
<label>4</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rzedowski]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
</person-group>
<source><![CDATA[La vegetación de México]]></source>
<year>1978</year>
<publisher-loc><![CDATA[México ]]></publisher-loc>
<publisher-name><![CDATA[Limusa]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B5">
<label>5</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gosz]]></surname>
<given-names><![CDATA[R.J.]]></given-names>
</name>
<name>
<surname><![CDATA[Gosz]]></surname>
<given-names><![CDATA[J.R]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Species interactions on the biome transition zone in New Mexico: response of blue grama (Bouteloua gracilis ) and black grama (Bouteloua eripoda) to fire and herbivory]]></article-title>
<source><![CDATA[Journal of Arid Environments]]></source>
<year>1996</year>
<volume>34</volume>
<page-range>101-14</page-range></nlm-citation>
</ref>
<ref id="B6">
<label>6</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[González]]></surname>
<given-names><![CDATA[D.J.]]></given-names>
</name>
<name>
<surname><![CDATA[Garza]]></surname>
<given-names><![CDATA[H.M.]]></given-names>
</name>
<name>
<surname><![CDATA[Villareal]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
</person-group>
<source><![CDATA[Evaluación de ecotipos de zacate navajita azul Bouteloua gracilis (H.B.K.) Lag. y su posible utilización en el desarrollo de variedades mejoradas]]></source>
<year>1976</year>
<publisher-loc><![CDATA[Saltillo, México ]]></publisher-loc>
<publisher-name><![CDATA[U.A.A.N.]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B7">
<label>7</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rodríguez O.]]></surname>
<given-names><![CDATA[M.E]]></given-names>
</name>
</person-group>
<source><![CDATA[Estudio de la germinación de cinco especies del género Bouteloua, en condiciones de laboratorio]]></source>
<year>1982</year>
<page-range>123</page-range><publisher-loc><![CDATA[Morelia, Michoacán ]]></publisher-loc>
<publisher-name><![CDATA[Universidad Michoacana de San Nicólas de Hidalgo]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B8">
<label>8</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Albertson]]></surname>
<given-names><![CDATA[F.W.]]></given-names>
</name>
<name>
<surname><![CDATA[Weaber]]></surname>
<given-names><![CDATA[J.E]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[History of the native vegetation of Western Kansas during seven years of continuos drought]]></article-title>
<source><![CDATA[Ecological Monographs]]></source>
<year>1942</year>
<volume>14</volume>
<page-range>1-29</page-range></nlm-citation>
</ref>
<ref id="B9">
<label>9</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Gentry]]></surname>
<given-names><![CDATA[H.S]]></given-names>
</name>
</person-group>
<source><![CDATA[Los pastizales de Durango. Estudio ecológico, fisiográfico y florístico]]></source>
<year>1957</year>
<publisher-loc><![CDATA[México ]]></publisher-loc>
<publisher-name><![CDATA[IMRNR]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B10">
<label>10</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Read]]></surname>
<given-names><![CDATA[J.J.]]></given-names>
</name>
<name>
<surname><![CDATA[Morgan]]></surname>
<given-names><![CDATA[J.A]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Growth and partitioning in Pascopyrum smithii (C3) and Bouteloua gracilis (C4) as influenced by carbon dioxide and temperature]]></article-title>
<source><![CDATA[Annals of Botany]]></source>
<year>1996</year>
<volume>77</volume>
<page-range>487-96</page-range></nlm-citation>
</ref>
<ref id="B11">
<label>11</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[García-Moya]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Villa]]></surname>
<given-names><![CDATA[J.V]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Factores ambientales que afectan la distribución geográfica y ecológica de Bouteloua gracilis (H.B.K.) Lag. ex Steud., en el Estado de San Luis Potosí]]></article-title>
<source><![CDATA[Agrociencia]]></source>
<year>1977</year>
<volume>28</volume>
<page-range>3-29</page-range></nlm-citation>
</ref>
<ref id="B12">
<label>12</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hernández]]></surname>
<given-names><![CDATA[X.E]]></given-names>
</name>
</person-group>
<source><![CDATA[Zacates indígenas. Xolocotzia, Tomo II]]></source>
<year>1987</year>
<publisher-loc><![CDATA[México ]]></publisher-loc>
<publisher-name><![CDATA[UACH]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B13">
<label>13</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hernández]]></surname>
<given-names><![CDATA[X.E]]></given-names>
</name>
</person-group>
<source><![CDATA[Los pastizales de las zonas áridas y semiáridas del centro y noreste de México. Xolocotzia, Tomo II]]></source>
<year>1964</year>
<publisher-loc><![CDATA[México ]]></publisher-loc>
<publisher-name><![CDATA[UACH]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B14">
<label>14</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Moreno]]></surname>
<given-names><![CDATA[M.E]]></given-names>
</name>
</person-group>
<source><![CDATA[Análisis agrostológico de la zona ganadera de Cananea]]></source>
<year>1965</year>
<page-range>68</page-range><publisher-loc><![CDATA[México ]]></publisher-loc>
<publisher-name><![CDATA[UACH]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B15">
<label>15</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rzedowski]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[McVaugh]]></surname>
<given-names><![CDATA[R]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[La vegetación de Nueva Galicia. Contributions from the University of Michigan]]></article-title>
<source><![CDATA[Herbarium]]></source>
<year>1966</year>
<volume>9</volume>
<page-range>1-23</page-range></nlm-citation>
</ref>
<ref id="B16">
<label>16</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lauenroth]]></surname>
<given-names><![CDATA[W.K.]]></given-names>
</name>
<name>
<surname><![CDATA[Sala]]></surname>
<given-names><![CDATA[E.O.]]></given-names>
</name>
<name>
<surname><![CDATA[Coffin]]></surname>
<given-names><![CDATA[D.P.]]></given-names>
</name>
<name>
<surname><![CDATA[Kirchner]]></surname>
<given-names><![CDATA[T.B]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The importance of soil water in the recruitment of Bouteloua gracilis in the shortgrass steppe]]></article-title>
<source><![CDATA[Ecological Applications]]></source>
<year>1994</year>
<volume>4</volume>
<page-range>741-9</page-range></nlm-citation>
</ref>
<ref id="B17">
<label>17</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Harper]]></surname>
<given-names><![CDATA[J.L]]></given-names>
</name>
</person-group>
<source><![CDATA[Population biology of plants]]></source>
<year>1977</year>
<publisher-loc><![CDATA[London ]]></publisher-loc>
<publisher-name><![CDATA[Academic Press]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B18">
<label>18</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hartgerink]]></surname>
<given-names><![CDATA[A.P.]]></given-names>
</name>
<name>
<surname><![CDATA[Bazzaz]]></surname>
<given-names><![CDATA[F.A]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Seedling-scale enviromental heterogeneity influences individual fitness and population structure]]></article-title>
<source><![CDATA[Ecology]]></source>
<year>1984</year>
<volume>65</volume>
<page-range>198-206</page-range></nlm-citation>
</ref>
<ref id="B19">
<label>19</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Keddy]]></surname>
<given-names><![CDATA[P.A.]]></given-names>
</name>
<name>
<surname><![CDATA[Constabel]]></surname>
<given-names><![CDATA[P]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Germination of ten shoreline plants in relation to seed size, soil particle size and water level: an experimental study]]></article-title>
<source><![CDATA[Journal of Ecology]]></source>
<year>1986</year>
<volume>74</volume>
<page-range>133-41</page-range></nlm-citation>
</ref>
<ref id="B20">
<label>20</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Peterson]]></surname>
<given-names><![CDATA[J.Ch.]]></given-names>
</name>
<name>
<surname><![CDATA[Carson]]></surname>
<given-names><![CDATA[P.W.]]></given-names>
</name>
<name>
<surname><![CDATA[McCarthy]]></surname>
<given-names><![CDATA[B.C.]]></given-names>
</name>
<name>
<surname><![CDATA[Pickett]]></surname>
<given-names><![CDATA[S.T.A]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Microsite variation and soil dynamics within newly created treefall pits and mounts]]></article-title>
<source><![CDATA[Oikos]]></source>
<year>1990</year>
<volume>58</volume>
<page-range>39-46</page-range></nlm-citation>
</ref>
<ref id="B21">
<label>21</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Snaydon]]></surname>
<given-names><![CDATA[R.W]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Microdistribution of Trifolium repens and its relation to soil factors]]></article-title>
<source><![CDATA[Journal of Ecology]]></source>
<year>1962</year>
<volume>50</volume>
<page-range>133-43</page-range></nlm-citation>
</ref>
<ref id="B22">
<label>22</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Watkins]]></surname>
<given-names><![CDATA[J.A.]]></given-names>
</name>
<name>
<surname><![CDATA[Wilson]]></surname>
<given-names><![CDATA[J.A]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Fine-scale community structure of lawns]]></article-title>
<source><![CDATA[Journal of Ecology]]></source>
<year>1992</year>
<volume>80</volume>
<page-range>15-24</page-range></nlm-citation>
</ref>
<ref id="B23">
<label>23</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Valiente B.]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Ezcurra]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Shade as cause of the association between the catus Neobuxbamia tetetzo and the nurse plant Mimosa luisana in the Tehuacan Valley, Mexico]]></article-title>
<source><![CDATA[Journal of Ecology]]></source>
<year>1991</year>
<volume>79</volume>
<page-range>961-71</page-range></nlm-citation>
</ref>
<ref id="B24">
<label>24</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hyder]]></surname>
<given-names><![CDATA[D.N.]]></given-names>
</name>
<name>
<surname><![CDATA[Everson]]></surname>
<given-names><![CDATA[A.C.]]></given-names>
</name>
<name>
<surname><![CDATA[Bement]]></surname>
<given-names><![CDATA[R.E]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Seedling morphology and seedling failures with blue grama]]></article-title>
<source><![CDATA[Journal of Range Management]]></source>
<year>1971</year>
<volume>24</volume>
<page-range>287-92</page-range></nlm-citation>
</ref>
<ref id="B25">
<label>25</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[García-Moya]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
</person-group>
<source><![CDATA[Apuntes del curso Ecología de Agostaderos]]></source>
<year>1996</year>
<publisher-loc><![CDATA[Montecillos, México ]]></publisher-loc>
<publisher-name><![CDATA[Instituto de Recursos Renovables]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B26">
<label>26</label><nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Rivas M.]]></surname>
<given-names><![CDATA[I.V]]></given-names>
</name>
</person-group>
<source><![CDATA[Cambios en el vecindario de Bouteloua gracilis por la exclusión del pastoreo en "El Gran Tunal", San Luis Potosí]]></source>
<year>1988</year>
<publisher-loc><![CDATA[Chapingo, México ]]></publisher-loc>
<publisher-name><![CDATA[Colegio de Postgraduados]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B27">
<label>27</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lauenroth]]></surname>
<given-names><![CDATA[W.K.]]></given-names>
</name>
<name>
<surname><![CDATA[Sala]]></surname>
<given-names><![CDATA[O.E.]]></given-names>
</name>
<name>
<surname><![CDATA[Milchunas]]></surname>
<given-names><![CDATA[D.G.]]></given-names>
</name>
<name>
<surname><![CDATA[Lathrop]]></surname>
<given-names><![CDATA[R.W]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Root dynamics of Boutelouagracilis during short-term recovery from drought]]></article-title>
<source><![CDATA[Functional Ecology]]></source>
<year>1987</year>
<volume>1</volume>
<page-range>117-24</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
