<?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>0188-4999</journal-id>
<journal-title><![CDATA[Revista internacional de contaminación ambiental]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Int. Contam. Ambient]]></abbrev-journal-title>
<issn>0188-4999</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Ciencias de la Atmósfera y Cambio Climático]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0188-49992016000200139</article-id>
<article-id pub-id-type="doi">10.20937/RICA.2016.32.02.01</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Estudio del valor indicador de las comunidades de algas bentónicas: una propuesta de evaluación y aplicación en el río Magdalena, Ciudad de México]]></article-title>
<article-title xml:lang="en"><![CDATA[Study the indicator taxa of benthonic algae communities: An Assessment proposal and their use in the Magdalena river, Mexico City]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carmona Jiménez]]></surname>
<given-names><![CDATA[Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez Rodríguez]]></surname>
<given-names><![CDATA[Rocío]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bojorge-García]]></surname>
<given-names><![CDATA[Miriam Guadalupe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[González Hidalgo]]></surname>
<given-names><![CDATA[Beatriz]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Cantoral-Uriza]]></surname>
<given-names><![CDATA[Enrique A.]]></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[Ciudad de México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Ciencias Unidad Multidisciplinaria de Docencia e Investigación]]></institution>
<addr-line><![CDATA[Juriquilla Querétaro]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma Metropolitana División de Ciencias Biológicas y de la Salud Departamento de Producción Agrícola y Animal]]></institution>
<addr-line><![CDATA[, Ciudad de México México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>05</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>05</month>
<year>2016</year>
</pub-date>
<volume>32</volume>
<numero>2</numero>
<fpage>139</fpage>
<lpage>152</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-49992016000200139&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-49992016000200139&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-49992016000200139&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN: La aplicación y desarrollo de las leyes ambientales que regulan el manejo de cuencas requiere la identificación de indicadores biológicos, los parámetros y las medidas para establecer su estado ecológico, para lo cual el presente estudio tiene como objetivo caracterizar el valor indicador ecológico de las algas bentónicas en una corriente urbana de la Ciudad de México. Se estudiaron seis sitios del río Magdalena en las estaciones más contrastantes del año: seca cálida, lluviosa y seca fría. En cada sitio se registraron los parámetros fisicoquímicos del agua y se recolectaron 10 muestras: cinco con crecimientos algales visibles y cinco con diatomeas. La calidad ambiental de cada sitio fue determinada por el estado trófico y su confirmación con la riqueza y diversidad algal bentónica, a través de un análisis de correspondencia canónica y del cálculo del valor indicador de las especies (IndVal). De acuerdo con el estado trófico se reconocieron tres grupos de sitios. El primer grupo (G1) fue valorado como de referencia de condiciones oligotróficas y presentó 11 especies con el mayor IndVal, sobresaliendo: Encyonema silesiacum, Gomphonema parvulum, Navícula cryptocephala, Planothidium lanceolatum, Vaucheria bursata, Placoma regulare y Nostoc parmelioides. Un segundo grupo (G2) se relacionó con 15 especies consideradas como detectoras, las cuales fueron tolerantes al incremento de nutrientes en al menos una época del año, tales como Diatoma mesodon y Prasiola mexicana. El tercer grupo (G3) incluyó sitios con especies que presentaron una amplia tolerancia a la contaminación: Fistulifera saprophila, Nitzschia minuta, Nitzschia palea, Nitzschia recta y Phormidium autumnale. El IndVal de las especies del río Magdalena ha permitido establecer los sitios de referencia de buena calidad ambiental y los que aparecen alterados por las actividades humanas, por lo que se recomiendan como el primer paso de una propuesta metodológica que permita el biomonitoreo a largo plazo a través de un índice biológico.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT: The application and development of environmental laws governing watershed management requires identification of biological indicators, parameters and measures to establish its ecological status, for which the present study aims to characterize the ecological indicator value of stream benthic algae in an urban area of Mexico City. Six sites of the Magdalena river were studied in the most contrasting seasons: dry-warm, rainy and dry-cold. At each site the physicochemical parameters of water were recorded and 10 samples were collected: Five with visible algal growths and five with diatoms. The environmental quality of each site was determined by the trophic status and its confirmation with the richness and benthic algal diversity, through a canonical correspondence analysis and the calculation of the indicator value of species (IndVal). According to the trophic status, three groups of sites were recognized. The first group (G1) was assessed as reference of the oligotrophic conditions and presented 11 species with the highest IndVal, protruding: Encyonema silesiacum, Gomphonema parvulum, Navicula cryptocephala, Planothidium lanceolatum, Vaucheria bursata, Placoma regulare and Nostocparmelioides. A second group (G2) was associated with 15 species considered detectors, which were tolerant to increased nutrients in at least one season, such as Diatoma mesodon and Prasiola mexicana. The third group (G3) included sites with species that had a wide range of tolerance to pollution: Fistulifera saprophila, Nitzschia minuta, Nitzschia palea, Nitzschia recta and Phormidium autumnale. The species IndVal of Magdalena River has established reference sites of good environmental quality and those that are altered by human activities, therefore they are recommended as the first step in a methodological proposal for a long-term biomonitoring through a biological index.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[algas epilíticas]]></kwd>
<kwd lng="es"><![CDATA[especies indicadoras]]></kwd>
<kwd lng="es"><![CDATA[ambiente lótico]]></kwd>
<kwd lng="en"><![CDATA[epilithic algae]]></kwd>
<kwd lng="en"><![CDATA[indicator species]]></kwd>
<kwd lng="en"><![CDATA[lotic environment]]></kwd>
</kwd-group>
</article-meta>
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