<?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>0188-8897</journal-id>
<journal-title><![CDATA[Hidrobiológica]]></journal-title>
<abbrev-journal-title><![CDATA[Hidrobiológica]]></abbrev-journal-title>
<issn>0188-8897</issn>
<publisher>
<publisher-name><![CDATA[Universidad Autónoma Metropolitana, División de Ciencias Biológicas y de la Salud]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0188-88972016000200187</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Diversidad en comunidades de diatomeas epilíticas con relación a los parámetros fisicoquímicos en la cabecera del río Zinapécuaro, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Diversity of epilithic diatoms communities related to physico-chemical parameters in the headwaters of the Zinapécuaro River, Mexico]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Segura-García]]></surname>
<given-names><![CDATA[Virginia]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Almanza Álvarez]]></surname>
<given-names><![CDATA[José Salvador]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ponce-Saavedra]]></surname>
<given-names><![CDATA[Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Michoacana de San Nicolás de Hidalgo Facultad de Biología ]]></institution>
<addr-line><![CDATA[Morelia Michoacán]]></addr-line>
<country>México</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Michoacana de San Nicolás de Hidalgo Facultad de Biología ]]></institution>
<addr-line><![CDATA[Morelia Michoacán]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2016</year>
</pub-date>
<volume>26</volume>
<numero>2</numero>
<fpage>187</fpage>
<lpage>202</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-88972016000200187&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-88972016000200187&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-88972016000200187&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Antecedentes: La cuenca del río Zinapécuaro presenta un alto grado de contaminación proveniente de diversas actividades económicas que se desarrollan en la zona, situación que ha generado un marcado deterioro ambiental. Desafortunadamente no existen estudios de la calidad del agua en este río y se desconoce el tipo de contaminantes presentes y las fuentes emisoras.  Objetivos: Estudiar la comunidad de diatomeas epilíticas de la cabecera del río Zinapécuaro, Michoacán, México.  Métodos: La recolecta se llevó a cabo durante un ciclo anual y se realizaron cuatro muestreos.  Resultados: Fueron identificadas 70 especies pertenecientes a las clases Coscinodiscophyceae, Fragilariophyceae y Bacillariophyceae, esta última fue representada con 62 taxones. Las especies comunes en todos los sitios fueron Achnanthidium exiguum, A. minutissimum, Encyonema silesiacum, Eolimna subminuscula, Frustulia latita, F. neomundana, Gomphonema lagenula, Navicula rhynchocephala, Nitzschia clausii, N. palea, Planothidium frequentissimum, P. lanceolatum y Rhopalodia brebisonii. Las especies presentes en sitios con mayor grado de eutrofización fueron Navicula germainii, N. recens, N. rhynchocephala, Nitzchia clausii, N. palea, N. inconspicua y Planothidium lanceolatum.  Conclusiones:  Mediante estimadores no paramétricos se encontró que la riqueza específica obtenida fue de 80.5 a 89.7% de la riqueza esperada. El análisis de rarefacción indicó que el esfuerzo de muestreo para representar la riqueza del área de estudio y los sitios seleccionados fue suficiente, excepto para el manantial y el río Yerbabuena en la época de lluvias (2013) y el manantial de la Yerbabuena en la época de estiaje (2013), en los que se requeriría un tamaño de muestra más grande. La mayor diversidad, estimada con el índice Shannon-Wiener, se presentó en Las Orquídeas (época de lluvias 2013). El análisis por temporadas mediante ANOSIM no mostró diferencia estadística significativa en similitud (p &gt;0.05) entre ellas; mientras que para sitios/temporadas sí hubo diferencias en los valores de similitud de Bray-Curtis. Las diferencias de distribución a nivel temporal y espacial se asociaron a diferencias en profundidad, nitritos, amonio, pH y dureza total.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Background: The Zinapécuaro River basin has a high level of pollution coming from different economic activities that take place in the area, which have caused noticeable environmental damage. Unfortunately, there are no studies of the water quality of this river and thus we have no information regarding what current pollutants are present or their emitting sources.  Goals:  We studied the epilithic diatom community of the headwaters of the Zinapécuaro River, Michoacán, Mexico.  Methods:  Samples were collected at four stages during a one-year period.  Results:  Seventy species pertaining to the classes Coscinodiscophyceae, Fragilariophyceae, and Bacillariophyceae were identified. The latter had 62 taxa. The species found at all of the sampling sites were Achnanthidium exiguum, A. minutissimum, Encyonema silesiacum, Eolimna subminuscula, Frustulia latita, F. neomundana, Gomphonema lagenula, Navicula rhynchocephala, Nitzschia clausii, N. palea, Planothidium frequentissimum, P. lanceolatum, and Rhopalodia brebisonii. Among the species found at the sites, the ones with the highest degree of eutrophication are Navicula germainii, N. recens, N. rhynchocephala, Nitzchia clausii, N. palea, N. inconspicua, and Planothidium lanceolatum.  Conclusions:  Using nonparametric estimators, we found that observed species richness represented 80.5 to 89.7% of the expected richness. Rarefaction analysis indicated that the sampling effort was enough to represent the species richness in the study area and at the selected sites, except at a spring and at the Yerbabuena River during the rainy season (2013), and the Yerbabuena spring during the dry season (2013), where a greater number of samples would be needed. The greatest diversity, estimated with the Shannon-Wiener index, was found at Las Orquídeas during the rainy season of 2013. Seasonal analysis using ANOSIM showed no statistically significant differences (p &gt;0.05), whereas Bray-Curtis similarity values did show statistically significant differences. Spatial and temporal distribution differences were associated with the differences in depth, nitrites, ammonium, pH, and total water hardness.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Análisis de diversidad]]></kwd>
<kwd lng="es"><![CDATA[Bacillariophyceae]]></kwd>
<kwd lng="es"><![CDATA[Coscinodiscophyceae]]></kwd>
<kwd lng="es"><![CDATA[eutrofización]]></kwd>
<kwd lng="es"><![CDATA[Flagilariophyceae]]></kwd>
<kwd lng="en"><![CDATA[Bacillariophyceae]]></kwd>
<kwd lng="en"><![CDATA[Coscinodiscophyceae]]></kwd>
<kwd lng="en"><![CDATA[diversity analysis]]></kwd>
<kwd lng="en"><![CDATA[eutrophication]]></kwd>
<kwd lng="en"><![CDATA[Fragilariophyceae]]></kwd>
</kwd-group>
</article-meta>
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