<?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>S0188-49992024000100156</article-id>
<article-id pub-id-type="doi">10.20937/rica.54368</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Bioindicadores de calidad del agua en la cuenca baja del río Ocoña, departamento de Arequipa, Perú, utilizando diatomeas epilíticas y su relación con algunos parámetros ambientales]]></article-title>
<article-title xml:lang="en"><![CDATA[Bioindicators of water quality in the lower reaches of the Ocoña river basin, Arequipa department, Peru, using epilithic diatoms and their relationship with some environmental parameters]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Motta Mamani]]></surname>
<given-names><![CDATA[Julia Cecilia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ranilla Falcón]]></surname>
<given-names><![CDATA[César Augusto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de San Agustín de Arequipa  ]]></institution>
<addr-line><![CDATA[Arequipa Arequipa]]></addr-line>
<country>Peru</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<volume>40</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-49992024000100156&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-49992024000100156&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-49992024000100156&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Se determinó la riqueza y estructura de la comunidad de diatomeas epilíticas y su relación con parámetros físicos, químicos y microbiológicos en la cuenca baja del río Ocoña, Departamento de Arequipa, Perú, en tres puntos de muestreo, en los meses de enero, mayo y octubre de 2019. Se identificaron 52 taxa de la división Bacillariophyta. Del total de taxones, 12 presentaron una abundancia relativa superior al 2 % y se utilizaron para el análisis de correspondencia canónica. La mayor riqueza de especies (39) se presentó en el mes de octubre. Los valores de diversidad H&#8217; (2.04 a 2.45 bit/cel) para enero y octubre representaron a una comunidad con una diversidad normal; mientras que los valores registrados en mayo (0.51 a 1.58 bit/cel) se asociaron a una diversidad baja. Según el Índice de Simpson la mayor dominancia (0.18) se presentó en el mes de mayo y estuvo representada por Nitzschia inconspicua, la equidad (J) mostró una distribución uniforme en la comunidad de diatomeas en los meses de enero (63 %) y octubre (69 %). Del análisis de correspondencia canónica, los taxones Diatoma moniliformis, Melosira varians y Nitzschia palea presentaron una relación positiva con los parámetros ambientales pH, dureza, SO4 -2, P, K, Na y Mg; mientras que Cocconeis placentula presentó una correlación positiva con pH, dureza, Ca, Mg y Na. Asimismo, Epithemia sorex, Nitzschia sp.1 y Ulnaria ulna presentaron una relación positiva con las concentraciones más altas de Fe, mientras que N. inconspicua se relacionó positivamente con los coliformes termotolerantes.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The species richness and community structure of an epilithic diatom community and their relationship with physical, chemical and microbiological parameters in the lower reaches of the Ocoña river basin, Arequipa Department, Perú, were determined at three sampling points in January, May, and October 2019. Fifty-two taxa of the Bacillariophyta division were identified. Of the total taxa, 12 had a relative abundance greater than 2% and were used for canonical correspondence analysis. The highest species richness (39) occurred in October. The H&#8217; diversity values (2.04 to 2.45 bit/cel) for January and October represent a community with normal diversity; while the values registered in May (0.51 to 1.58 bit/cel) are associated with low diversity. According to the Simpson Index, the highest dominance (0.18) occurred in May and was represented by Nitzschia inconspicua; equity (J) showed a uniform distribution in the diatom community in January (63%) and October (69%). From the canonical correspondence analysis, the taxa Diatoma moniliformis, Melosira varians, and Nitzschia palea presented a positive relationship with the environmental parameters pH, hardness, SO4 -2, P, K, Na, and Mg, while Cocconeis placentula exhibited a positive correlation with pH, hardness, Ca, Mg, and Na. Likewise, Epithemia sorex, Nitzschia sp.1, and Ulnaria ulna showed a positive relationship with the highest Fe concentrations, while N. inconspicua was positively related to thermotolerant coliforms.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[diversidad de especies]]></kwd>
<kwd lng="es"><![CDATA[contaminación del agua]]></kwd>
<kwd lng="es"><![CDATA[índices de diversidad]]></kwd>
<kwd lng="es"><![CDATA[biodiversidad]]></kwd>
<kwd lng="en"><![CDATA[species diversity]]></kwd>
<kwd lng="en"><![CDATA[water contamination]]></kwd>
<kwd lng="en"><![CDATA[diversity indexes]]></kwd>
<kwd lng="en"><![CDATA[biodiversity]]></kwd>
</kwd-group>
</article-meta>
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