<?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>S0188-88972015000300391</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Metabolismo lacustre de un lago tropical profundo: ¿Fuente o sumidero de carbono?]]></article-title>
<article-title xml:lang="en"><![CDATA[Lake metabolism of a deep, tropical lake: Carbon source or sink?]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Oseguera]]></surname>
<given-names><![CDATA[Luis A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Alcocer]]></surname>
<given-names><![CDATA[Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villarreal Quintero]]></surname>
<given-names><![CDATA[Einye Y.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Estudios Superiores Iztacala Proyecto de Investigación en Limnología Tropical]]></institution>
<addr-line><![CDATA[ Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional Autónoma de México Facultad de Ciencias ]]></institution>
<addr-line><![CDATA[D.F. México]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<volume>25</volume>
<numero>3</numero>
<fpage>391</fpage>
<lpage>399</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-88972015000300391&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-88972015000300391&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-88972015000300391&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Los sistemas acuáticos epicontinentales constituyen un componente importante en el ciclo global del carbono. Con el fin de generar una línea base respecto a si los lagos tropicales funcionan como fuente o sumidero de dióxido de carbono (CO2) se evaluó la producción primaria bruta, neta y la respiración en la zona eufótica de un lago oligotrófico tropical profundo. La producción primaria bruta (PPB) fluctuó entre 1,809 y 4,195 mg C m-2 d-1 y se observaron picos a lo largo del año asociados a los tres eventos fitoplanctónicos más relevantes: el florecimiento de diatomeas en la época de circulación, el de cianobacterias a inicio de la estratificación y el máximo profundo de clorofila durante la estratificación. La respiración varió entre 87 y 5,966 mg C m-2 d-1. A pesar de su condición oligotrófica, el lago Alchichica funciona como sumidero de CO2 ya que tiene un comportamiento autotrófico la mayor parte del año; la producción primaria bruta (PPB) anual excede a la respiración (R) (PPB:R = 4.39 ± 6.84) y por lo tanto la PPN anual es positiva.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: The epicontinental aquatic systems are an important component in the global carbon cycle. In order to generate a baseline as whether tropical lakes act as carbon dioxide (CO2) source or sink, we evaluated the gross (GPP) and net (NPP) primary production and respiration (R) in the euphotic zone of a deep, oligotrophic, tropical lake. GPP fluctuated between 1,809 and 4,195 mg C m-2 d-1; three peaks were observed throughout the year. These peaks are associated to the three main phytoplankton events of Lake Alchichica: the diatom bloom during the mixing period, the cyanobacteria bloom at the onset of the stratification period and the deep chlorophyll maximum along the stratification. R varied between 87 and 5,966 mg C m-2 d-1. Despite its oligotrophic condition, Lake Alchichica acts as a CO2 sink because it is mostly autotrophic along the year. The annual gross primary production (GPP) exceeds respiration (GPP:R = 4.39 ± 6.84 ) and therefore, the annual NPP was is positive.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Lago oligotrófico]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
<kwd lng="es"><![CDATA[producción primaria]]></kwd>
<kwd lng="es"><![CDATA[respiración]]></kwd>
<kwd lng="en"><![CDATA[Mexico]]></kwd>
<kwd lng="en"><![CDATA[oligotrophic lake]]></kwd>
<kwd lng="en"><![CDATA[primary production]]></kwd>
<kwd lng="en"><![CDATA[respiration]]></kwd>
</kwd-group>
</article-meta>
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