<?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>S0188-49992022000100130</article-id>
<article-id pub-id-type="doi">10.20937/rica.54408</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Developing nutrient criteria for the Grijalva basin, Mexico]]></article-title>
<article-title xml:lang="es"><![CDATA[Hacia el desarrollo de criterios de nutrientes en la cuenca Grijalva, México]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Barrientos-Pérez]]></surname>
<given-names><![CDATA[Ana Aurora]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castillo]]></surname>
<given-names><![CDATA[María Mercedes]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mendoza-Carranza]]></surname>
<given-names><![CDATA[Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Jarquín-Sánchez]]></surname>
<given-names><![CDATA[Aarón]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,El Colegio de la Frontera Sur  ]]></institution>
<addr-line><![CDATA[Villahermosa Tabasco]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2022</year>
</pub-date>
<volume>38</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-49992022000100130&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-49992022000100130&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-49992022000100130&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Excess nutrient inputs are a major cause of aquatic ecosystem impairment worldwide. Increased total phosphorus (TP) and total nitrogen (TN) concentrations can lead to eutrophication affecting ecosystem functioning and environmental services provided by streams and rivers. Establishing numeric nutrient criteria is a strategy to reduce nutrient inputs into freshwater ecosystems. Our objective was to estimate nutrient concentrations that could be used as guides to establish nutrient criteria for TP and TN in the Grijalva basin, Mexico. We applied the frequency distribution method to water quality monitoring data for subregions (upper, middle, and lower Grijalva) and for the whole basin, considering two stream size categories. Nutrients were also compared among subregions, land uses, and stream sizes. Agriculture and urban areas showed higher nutrient concentrations than other land uses, probably due to the use of fertilizers and inputs of domestic and industrial wastewater. Higher nutrient concentrations were found in the middle Grijalva and in low-order streams. Nutrient concentrations at the 75th percentile for the reference sites were higher than those obtained at the 5th, 16.7th, and 25th percentiles for the general nutrient data, probably due to the high level of human disturbance in the Grijalva basin. Nutrient concentrations at the 25th percentile are probably too high to protect the aquatic ecosystems in the basin, while concentrations at the 5th percentile can be too restrictive for the basin. Based on our results, nutrient concentrations at the 16.7th percentile are proposed as a first approximation for nutrient criteria to protect river systems in the Grijalva basin.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El exceso de nutrientes es una de las mayores causas del deterioro de los ecosistemas acuáticos. El incremento de fósforo total (PT) y nitrógeno total (NT) puede conducir a la eutrofización, afectando la funcionalidad de los ecosistemas y sus servicios ambientales. Establecer criterios numéricos es una estrategia para reducir las entradas de nutrientes en los ecosistemas de agua dulce. El objetivo de este trabajo fue estimar las concentraciones que guíen el establecimiento de criterios de nutrientes para PT y NT en la cuenca Grijalva, México. Se aplicó el método de distribución de frecuencia por subregiones y toda la cuenca, considerando dos categorías de tamaño de ríos. Se compararon concentraciones entre subregiones, usos de suelo y tamaño de ríos. Las áreas de agricultura y urbanas mostraron concentraciones mayores que otros usos de suelo, debido probablemente al uso de fertilizantes y entradas de aguas residuales. Las concentraciones fueron más altas en el medio Grijalva y ríos de menor orden. En el percentil 75 de los sitios referencia, las concentraciones fueron más altas que en los percentiles 5, 16.7 y 25 del conjunto de datos, probablemente por el alto grado de perturbación antrópica. En el percentil 25 se encontraron concentraciones altas que podrían ser insuficientes para proteger los ecosistemas acuáticos mientras que las concentraciones del percentil 5 son muy restrictivas. De acuerdo con los resultados obtenidos, el percentil 16.7 puede ser una primera aproximación a los criterios de nutrientes para proteger los ecosistemas acuáticos en la cuenca Grijalva.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[eutrophication]]></kwd>
<kwd lng="en"><![CDATA[nitrogen]]></kwd>
<kwd lng="en"><![CDATA[phosphorus]]></kwd>
<kwd lng="es"><![CDATA[eutrofización]]></kwd>
<kwd lng="es"><![CDATA[nitrógeno]]></kwd>
<kwd lng="es"><![CDATA[fósforo]]></kwd>
</kwd-group>
</article-meta>
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