<?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>0187-7151</journal-id>
<journal-title><![CDATA[Acta botánica mexicana]]></journal-title>
<abbrev-journal-title><![CDATA[Act. Bot. Mex]]></abbrev-journal-title>
<issn>0187-7151</issn>
<publisher>
<publisher-name><![CDATA[Instituto de Ecología A.C., Centro Regional del Bajío]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0187-71512017000200079</article-id>
<article-id pub-id-type="doi">10.21829/abm119.2017.1233</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Efecto de la ganadería y la variación estacional sobre la composición florística y la biomasa vegetal en los humedales de la costa centro oeste del Golfo de México]]></article-title>
<article-title xml:lang="en"><![CDATA[Effect of livestock and seasonal variation on floristic composition and plant biomass in wetlands of the central western coast of the Gulf of Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Medina]]></surname>
<given-names><![CDATA[Karla]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Moreno-Casasola]]></surname>
<given-names><![CDATA[Patricia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Yañez-Arenas]]></surname>
<given-names><![CDATA[Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto de Ecología, A.C. Red de Ecología Funcional ]]></institution>
<addr-line><![CDATA[Xalapa Veracruz]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Ciencias ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<numero>119</numero>
<fpage>79</fpage>
<lpage>99</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0187-71512017000200079&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0187-71512017000200079&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0187-71512017000200079&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Antecedentes y Objetivos: Los humedales son ecosistemas altamente productivos que aportan diversos servicios ecosistémicos; sin embargo, también son de los más amenazados debido a actividades humanas como la agricultura y ganadería. México ha perdido 62% de sus humedales y específicamente los de la costa central del Golfo de México se están viendo afectados debido a la actividad ganadera. Existen pocos trabajos acerca del tema; por tanto, en esta investigación se analizó el efecto de la ganadería y la estacionalidad sobre la composición florística, biomasa aérea (BA) y biomasa subterránea (BS) de humedales herbáceos de la laguna de Alvarado, Veracruz, México.  Métodos: Se seleccionaron dos localidades de trabajo y en cada una se eligieron dos sitios de muestreo. En cada sitio se colocaron ocho parcelas de 1 m² (la mitad fueron cercadas para evitar al ganado). Durante un año se obtuvieron datos de riqueza y diversidad de especies, cobertura vegetal, BA y BS. Con estos datos se calculó el valor de importancia relativa (VIR) por especie e índice de reemplazo de especies.  Resultados clave: Se registraron 29 especies y se observó un gradiente de perturbación, resultando las localidades de Río Blanco las más conservadas. En general la riqueza fue significativamente mayor en lluvias y las especies con mayor VIR fueron las propias de humedales, aunque hubo gramíneas dominan-tes en ambas temporadas. La BS fue significativamente mayor en Río Blanco (sitio 1), y la BA en Río Blanco 1 y Río Limón 1. En lluvias la BA fue mayor en la mitad de los sitios.  Conclusiones: Con los resultados de este trabajo se observa que los humedales herbáceos de agua dulce pueden conservar sus funciones ecológicas en presencia de la ganadería siempre y cuando sea de bajo impacto. Inclusive, si ésta se practica de manera controlada, puede favorecer la diversidad de especies nativas del humedal y limitar el crecimiento de pastos invasores.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Background and Aims: Wetlands are highly productive ecosystems, which provide many environmen-tal services. However, they are one of the most threatened due to human activities such as agriculture and livestock. Mexico has lost 62% of its wetlands and specifically those of the central coast of the Gulf of Mexico are being affected due to livestock pressure. There are very few studies about the subject, so in this paper we analyze the effect of livestock and seasonality on floristic composition, above ground biomass (AB) and below ground biomass (BB) of the Alvarado lagoon, Veracruz, Mexico.  Methods: We selected two working locations, and in each locality chose two sampling sites. In each site, we placed eight 1 m² plots of four different locations (half were fenced to keep out livestock). For an entire year we obtained species richness and diversity, and data on vegetation cover, as well as AB and BB. With the data obtained, we calculated the Relative Importance Value (RIV) by species and the relative replacement rate of species.  Key results: Total richness resulted in 29 species. A disturbance gradient was observed, with the best con-served sites in Río Blanco. In most sites, species richness was significantly higher in rainfall and species with high RIV were typical wetland species, although there were dominant grasses in both climatic seasons. BB was significantly higher in one location of Rio Blanco, and AB in one location of Rio Blanco and in one from Rio Limon. During the rainy season, AB was higher in half of the sites.  Conclusions: We conclude that freshwater wetlands can retain their ecological functions in the presence of livestock as long as the impact is low. Even if there is cattle grazing with a controlled management, it can promote diversity of native wetland species and limit the growth of invasive grasses.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[especies invasoras]]></kwd>
<kwd lng="es"><![CDATA[impacto humano]]></kwd>
<kwd lng="es"><![CDATA[inundación]]></kwd>
<kwd lng="es"><![CDATA[popales]]></kwd>
<kwd lng="es"><![CDATA[riqueza florística.]]></kwd>
<kwd lng="en"><![CDATA[flood]]></kwd>
<kwd lng="en"><![CDATA[herbaceous wetlands]]></kwd>
<kwd lng="en"><![CDATA[human impact]]></kwd>
<kwd lng="en"><![CDATA[invasive species]]></kwd>
<kwd lng="en"><![CDATA[species richness]]></kwd>
</kwd-group>
</article-meta>
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