<?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>S0188-49992020000100209</article-id>
<article-id pub-id-type="doi">10.20937/rica.2020.53392</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[INCREMENTO DE NITRÓGENO EN Thalassia testudinum POR EL APORTE DE NITRÓGENO DISUELTO INORGÁNICO DE AGUAS RESIDUALES DURANTE PRECIPITACIONES EXTRAORDINARIAS]]></article-title>
<article-title xml:lang="en"><![CDATA[NITROGEN INCREASE IN Thalassia testudinum BY THE CONTRIBUTION OF DISSOLVED INORGANIC NITROGEN FROM WASTEWATER IN EXTRAORDINARY PRECIPITATIONS]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Anguas Cabrera]]></surname>
<given-names><![CDATA[Dilian]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ortiz Hernández]]></surname>
<given-names><![CDATA[María Concepción]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Camacho Cruz]]></surname>
<given-names><![CDATA[Karla]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sánchez González]]></surname>
<given-names><![CDATA[Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Politécnico Nacional Centro Interdisciplinario de Ciencias Marinas ]]></institution>
<addr-line><![CDATA[La Paz Baja California Sur]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,El Colegio de la Frontera Sur Unidad Chetumal ]]></institution>
<addr-line><![CDATA[Chetumal Quintana Roo]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<volume>36</volume>
<numero>1</numero>
<fpage>209</fpage>
<lpage>214</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-49992020000100209&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-49992020000100209&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-49992020000100209&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Las lagunas de arrecife del Caribe mexicano son ecosistemas oligotróficos, donde las descargas de agua residuales (DAR) asociadas a la actividad turística, en algunos casos son vertidas a los acuíferos subterráneos, suministrando nitrógeno inorgánico disuelto (NID) a las mismas. El aporte de NID puede ser exacerbado en años con precipitación extraordinaria (2013 con &gt; 2500 mm) en el Caribe mexicano. Por su parte, el pasto marino Thalassia testudinum se caracteriza por un contenido de nitrógeno &lt; 2 % en peso seco. Si el flujo de NID se incrementa debido a precipitaciones excepcionales, es de esperar que el contenido de nitrógeno en T. testudinum aumente con respecto a la precipitación promedio histórica (1200 mm) de los últimos 30 años. En el presente trabajo se cuantificó el contenido de nitrógeno en T. testudinum mediante un analizador elemental, para determinar cambios asociados con las DAR durante la época seca y lluviosa entre los años 2010 a 2016 en la Bahía de Akumal. En los años de 2010, 2012, 2015 y 2016 el contenido de nitrógeno fue similar entre épocas y en los años 2013 y 2014 fue mayor en la época de lluvias con respecto a la época seca. Esto sugiere que, en periodos de precipitaciones extraordinarias el flujo de NID a las lagunas costeras del Caribe incrementa haciendo disponible este nitrógeno para T. testudinum.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT The Mexican Caribbean reef lagoons are oligotrophic ecosystems, where residual water discharges (RWD) associated with tourist activity to groundwater aquifer systems supply additional dissolved inorganic nitrogen (DIN) to these lagoons. The contribution of DIN can be exacerbated in years with extraordinary precipitation (&gt; 2500 mm in 2013) in the Mexican Caribbean. Thalassia testudinum seagrass is characterized by a nitrogen content &lt; 2 % dry weight. If the DIN flow increases in exceptional rainfall, it is expected that the content of nitrogen in T. testudinum will increase with respect to the historical average precipitation (1200 mm) of the last 30 years. In the present work the nitrogen content in T. testudinum is quantified in order to determine changes associated with the RWD during the dry and rainy season from 2010 to 2016 in Akumal Bay. The nitrogen content in the leaves of T. testudinum was quantified in an elemental analyzer. In the years of 2010, 2012, 2015 and 2016 the nitrogen content in T. testudinum was similar between dry and rainy season. In the years of 2013 and 2014, the nitrogen content was higher in the rainy season with respect to the dry season. This evidence suggests that in periods of extraordinary rainfall, the flow of DIN to the coastal lagoons of the Caribbean increases, making this nitrogen available to the seagrass T. testudinum.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[pasto marino]]></kwd>
<kwd lng="es"><![CDATA[Caribe mexicano]]></kwd>
<kwd lng="es"><![CDATA[acuífero subterráneo]]></kwd>
<kwd lng="es"><![CDATA[oligotrófico]]></kwd>
<kwd lng="es"><![CDATA[laguna de arrecife]]></kwd>
<kwd lng="en"><![CDATA[seagrass]]></kwd>
<kwd lng="en"><![CDATA[Mexican Caribbean]]></kwd>
<kwd lng="en"><![CDATA[groundwater aquifer]]></kwd>
<kwd lng="en"><![CDATA[oligotrophic]]></kwd>
<kwd lng="en"><![CDATA[reef lagoons]]></kwd>
</kwd-group>
</article-meta>
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<year>1995</year>
<volume>122</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>33-40</page-range></nlm-citation>
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