<?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>S0188-88972016000200161</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Diatomeas perifíticas del lago de Pátzcuaro, Michoacán, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Periphytic diatoms of Lake Pátzcuaro, Michoacán, Mexico]]></article-title>
</title-group>
<contrib-group>
<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[Israde Alcántara]]></surname>
<given-names><![CDATA[Isabel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<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-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 Instituto de Ciencias de la Tierra Departamento de Geología y Mineralogía]]></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>161</fpage>
<lpage>185</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-88972016000200161&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-88972016000200161&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-88972016000200161&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen:  Antecedentes: El Lago de Pátzcuaro ha estado expuesto en el pasado reciente a deterioro ambiental con incrementos en su eutroficación, como resultado de la deforestación, uso indiscriminado de agroquímicos, pesca excesiva, desarrollo urbano no planificado y la descarga de aguas negras.  Objetivos:  Con la finalidad de contribuir con el inventario ficoflorístico del lago, se presenta la descripción taxonómica de las diatomeas perifíticas encontradas, incluyendo datos morfométricos y merísticos, figuras, así como anotaciones ecológicas y de distribución.  Métodos:  Los muestreos se realizaron en cuatro sitios durante dos periodos distintos: postlluvias y estiaje (secas) durante octubre 2004 y mayo 2005. Las muestras se obtuvieron raspando la vegetación flotante y arraigada. Los frústulos de las diatomeas se limpiaron oxidando la muestra con ácido clorhídrico y peróxido de hidrógeno; se elaboraron preparaciones permanentes con la resina Naphrax®, que fueron analizadas con microscopía óptica.  Resultados:  Un total de 83 especies de diatomeas perifíticas fueron determinadas, incluyendo ocho variedades y una forma; 20 especies (24%) constituyen los primeros registros para México y 57 (68.6%) para el área de estudio. 62 especies (74.7%) son de distribución cosmopolita y seis (7.2%) de afinidad tropical. La riqueza de especies fue ligeramente mayor en la época de poslluvias (octubre 2004) con 69 taxones en total y 65 durante el estiaje (mayo 2005). Entre los sitios de muestreo, Janitzio presentó la mayor diversidad de diatomeas, con 46 taxones durante el estiaje.  Conclusiones:  El deterioro del lago de Pátzcuaro en las últimas décadas ha repercutido en la salud del ecosistema. Las diatomeas identificadas en este estudio, evidencian una clara tendencia a la eutrofización del cuerpo de agua.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract:  Background: Lake Pátzcuaro has been exposed in the recent past to environmental deterioration with increasing eutrophication as a result of deforestation, indiscriminate use of agrochemicals, overfishing, unplanned urban growth, and sewage dumping.  Goals:  In order to contribute to the phycofloristic inventory of the Lake, we present the taxonomic description of the periphytic diatoms found, including morphometric information, meristic data, figures, as well as ecological and distributional notes.  Methods:  Sampling was carried out in four sites during two periods: after the rainy season (October 2004) and the dry season (May 2005); samples were gathered by scraping rooted and floating vegetation. Diatoms´ thecae were cleared with hydrochloric acid and hydrogen peroxide; permanent slides were made with Naphrax® resin and analyzed through optic microscopy.  Results:  A total of 83 periphytic diatom species were recorded, including eight varieties and one form; 20 species (24%) represent the first records for Mexico and 57 (68.6%) are new to the study area. Sixty-two species (74.7%) have cosmopolitan distribution and six (7.2%) have tropical affinity. Species richness was slightly higher after the rainy season (October 2004) with a total of 69 taxa, compared to 65 species recorded during the dry season (May 2005). Among the sampling sites, the island of Janitzio had the highest diatom diversity (46 taxa during the dry season).  Conclusions: Deterioration of Lake Pátzcuaro in the previous decades has taken a toll on the health of its ecological system. Diatoms identified in this study indicate a clear tendency of eutrophication of the waterbody.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Lago de Pátzcuaro]]></kwd>
<kwd lng="es"><![CDATA[Perifiton]]></kwd>
<kwd lng="es"><![CDATA[sistemas lénticos]]></kwd>
<kwd lng="es"><![CDATA[taxonomía]]></kwd>
<kwd lng="en"><![CDATA[Lake Pátzcuaro]]></kwd>
<kwd lng="en"><![CDATA[lentic systems]]></kwd>
<kwd lng="en"><![CDATA[periphyton]]></kwd>
<kwd lng="en"><![CDATA[taxonomy]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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